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Dissertations / Theses on the topic 'HSLA'

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Published: 4 June 2021
Last updated: 1 February 2022

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1

Douglas, Brent A. "Nonmetallic inclusions in HSLA steel weldments." Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/27164.

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2

Roucoules, Christine. "Dynamic and metadynamic recrystallization in HSLA steels." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=39794.

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A Mo, a Nb and a Ti steel were tested in torsion to study the characteristics of dynamic and postdynamic recrystallization. To characterize dynamic recrystallization, continuous torsion tests were carried out between 850 and 1050$ sp circ$C at strain rates of 0.02, 0.2 and 2s$ sp{-1}.$ Quenches were performed to investigate the grain refinement produced by dynamic recrystallization. Interrupted torsion tests were performed between 850 and 1050$ sp circ$C and at strain rates between 0.02 and 2s$ sp{-1}$ to study the characteristics of postdynamic recrystallization. Quenches were performed after
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3

Ratnaraj, Ratnasabapathy. "Nitrogen in HSLA and dual phase steels." Thesis, University of Canterbury. Mechanical Engineering, 1989. http://hdl.handle.net/10092/7712.

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Nitrogen is universally present in all steels, and although its solubility under normal steelmaking conditions is small it can exert large effects on steel properties. Some of these effects are detrimental, often being associated with various embrittlement phenomena. This has led to liquid steel refining processes designed, amongst other things, to decrease the nitrogen content. However nitrogen also has beneficial effects, and since it is abundant and cheap, different steels containing enhanced nitrogen have been developed, Nitrogen levels obtained in the traditional steelmaking processes ar
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4

Chiu, Fon-Jen. "Thermomechanical processing of Ti-bearing HSLA steel." Thesis, University of Sheffield, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322984.

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5

Heinze, Marvin H. "The effect of aging treatment on the microstructure and properties of copper-precipitation strengthened HSLA steel." Thesis, Monterey, California. Naval Postgraduate School, 1988. http://hdl.handle.net/10945/23189.

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Approved for public release; distribution is unlimited<br>The high strength low alloy (HSLA) steels which are being developed as replacements for the HY family of steels ire low carbon steels which derive their strength in part due to the precipitation of fine coherent copper particles formed during a quench and aging heat treatment. HSLA- 100 is being developed to meet the strength and oughness requirements of HY-100 but can be easily welded without preheat, thereby reducing fabrication costs. This investigation uses light and electron microscopy for microstructural characterization while te
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6

Peters, Daniel Joseph. "Submerged arc welding consumables for HSLA-100 steel." Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/26280.

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7

Mattes, Victor R. "Microstructure and mechanical properties of HSLA-100 steel." Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA242937.

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Thesis (M.S. in Mechanical Engineering and Mechanical Engineer)--Naval Postgraduate School, December 1990.<br>Thesis Advisor(s): Fox, Alan G. "December 1990." Description based on title screen as viewed on April 2. 2010. DTIC Identifier(s): Steel, Microstructure, Mechanical Properties, Copper, Quenching, Tempering, Processing, Naval Vessels, HSLA-100 Steel, Theses, Age Hardening, Modulus of Elasticity, Charpy V Notch Tests. Author(s) subject terms: HSLA-100, Mechanical Properties, Copper Precipitation, Carbide. Includes bibliographical references (p. 66-68). Also available in print.
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8

Gonçalves, Hugo Miguel Dias. "Estudo de parâmetros de soldadura em aços HSLA." Master's thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/17011.

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Mestrado em Ciência e Engenharia de Materiais<br>Os ganhos de eficiência energética e a sustentabilidade estão na base do desenvolvimento de materiais com melhores propriedades específicas. Este é o caso das ligas leves e dos aços de baixa liga e elevada resistência (High Strength Low Alloy -HSLA- steels) que substituíram aços tradicionais, com teores mais elevados de elementos de liga. No caso da indústria automóvel, os aços HSLA têm utilização numa grande diversidade de componentes estruturais e permitem reduções significativas de peso e também de custo. O fabrico destes componentes envolve
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9

Wang, Ganlin. "Static recrystallization and precipitation in Nb-Al HSLA steels." Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74566.

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Constant true strain rate (2 s$ sp{-1})$ compression tests with one or two interruptions were carried out on a series of steels over the temperature range 900-1050$ sp circ$C. Based on a 0.07% C, 1.25% Mn and 0.006% N reference steel, the three microalloyed steels contained the following: (i) 0.08% Al, (ii) 0.04% Nb, or (iii) 0.045% Nb and 0.08% Al. The degree of fractional softening during the interpass was used to assess recrystallization start (R$ sb{ rm s})$ and finish (R$ sb{ rm f})$ times as well as those for the onset (P$ sb{ rm s})$ and termination (P$ sb{ rm f})$ of precipitation.<br>
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10

Devkate, Pushkar. "High temperature oxidation of HSLA steel under vapor conditions." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-80125.

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11

Enstad, Anne-Jorunn. "EBSD-karakterisering av et HSLA-stål under in situ varmebehandling." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for materialteknologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-16317.

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Ved sveising av HSLA-st&#229;l (High Strength Low Alloy) designet for lavtemperatur applikasjoner kan det dannes lokale spr&#248; soner som martensitt/austenitt-faser (MA-faser). Det er derfor &#248;nskelig &#229; karakterisere austenitten som dannes ved tosykel sveising for &#229; gi &#248;kt kunnskap om endringene som oppst&#229;r i mikrostrukturen.Denne masteroppgaven tar for seg karakterisering av et 420 MPa HSLA-st&#229;l ved in situ varmebehandling opp til tofaseomr&#229;det for austenitt og ferritt i kombinasjon med diffraksjon av tilbakespredte elektroner (Electron Backscatter Diffrac
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12

Patel, Jitendra Kumar. "The controlled hot-rolling of HSLA steels to optimise properties." Thesis, Swansea University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.547855.

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High strength steels have provided a unique opportunity for the automotive industry to achieve weight reduction via reduced material thickness whilst maintaining performance requirements such as crash worthiness. However, the initial success of HSLA steels was constrained by inconsistencies in the final mechanical properties. Although significant improvements in both mechanical and dimensional properties have since been made, increasingly stringent customer specifications for high strength steels mean that the challenge to reduce variability in automotive HSLA steel products and enure their co
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13

Wang, Fei. "Austenite grain growth behaviour of HSLA steel during reheating treatment." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7415/.

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The grain growth behaviour during reheating between 950 ºC and 1300 ºC of as-cast Al-Nb steel (containing 0.019 wt% Nb and 0.057 wt% Al) and rolled Nb-containing steel (containing 0.028 wt% Nb and 0.031 wt% Al) have been investigated. In particular the role of microalloying element segregation during casting and, hence the spatial distribution of microalloying precipitates, on grain boundary pinning during reheating has been considered. The Al-Nb containing steel has been examined in separate initial conditions, including as-cast (segregated structure), homogenised and forged (reduced separati
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14

McNutt, Steven A. "Stress relief cracking in copper-precipitation strengthened HSLA-100 steel." Thesis, Monterey, California. Naval Postgraduate School, 1988. http://hdl.handle.net/10945/23410.

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Approved for public release; distribution is unlimited<br>The US Navy is currently developing a new family of high-strength , low-alloy steels which derive a significant portion of their strength from copper precipitation. These highly weldable steels require little or no preheat. resulting in substantial cost savings. The first of these steels. HSLA-80, has been certified for ship construction, but recent studies have indicated some susceptibility to stress relief cracking in weldments. HSLA-100, a modification of HSLA-80, is now being considered for several higher-strength naval structure
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15

Wang, Ganlin. "Effect of aluminum on recrystallization and precipitation of Nb HSLA steels." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=65336.

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16

Hu, Wei. "Data-driven metallurgical design for high strength low alloy (HSLA) steel." [Ames, Iowa : Iowa State University], 2008.

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17

Horschel, Jeffery D. "Mode one fracture toughness testing of friction stir processed HSLA-65 /." Diss., CLICK HERE for online access, 2008. http://contentdm.lib.byu.edu/ETD/image/etd2473.pdf.

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18

Horschel, Jeffery D. "Mode I Fracture Toughness Testing of Friction Stir Processed HSLA-65." BYU ScholarsArchive, 2008. https://scholarsarchive.byu.edu/etd/1495.

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In order to investigate the viability of friction stir welding for use in Naval construction, mode one elastic-plastic fracture toughness of friction stir processed HSLA-65 was determined using current ASTM 1820 and BS 7448 standards. Double-sided welds were used to achieve 12.7 mm thick samples. A constant feed rate of 100 mm/min was used for all welds. To explore the effect of weld parameters on toughness, welds were produced using two rotational speeds: 340 RPM and 490 RPM. The weld centerline, advancing side hardened region (ASHR), and TMAZ/HAZ regions were sampled, in addition to un-welde
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19

Mendoza, Adalberto Rosales. "Relationship between microstructure, properties and HICC resistance of HSLA steel weld metals." Thesis, University of Leeds, 2008. http://etheses.whiterose.ac.uk/697/.

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The effects of microstructure, mechanical properties and hydrogen content on the hydrogen induced cold cracking (HICC) resistance of high strength low alloy (HSLA) steel weld metals were studied in this investigation. The weld metals were designed in a previous work. Their microstructures were characterised by optical and electron microscopy (FEG-SEM and TEM). Microphases, such as non metallic inclusions (NMI) and martensite-austenitecarbide constituent (MAC), were studied in some detail due to their hydrogen trapping capacity. Fractographic studies of hydrogen charged tensile samples were car
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20

Tecco, D. G. "Thermal cycles and HAZ characteristics of single pass welds in HSLA steels." Thesis, Cranfield University, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356254.

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21

Åström, August, and Morgan Sten. "Macro segregation in continuous cast HSLA steels : With correlation to impact toughness." Thesis, KTH, Materialvetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-254348.

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The report reviews macro segregations in continuous cast steels and possible correlations to impact toughness. The purpose of the thesis is to investigate centreline segregates and V-segregates to see which of them that affect impact toughness the most. Apart from a literature study, Charpy-V data was collected with permission from SSAB for two steel types, grade A and grade B, each with respective dominant segregation type. The collected data was yielded in three individual Charpy-V tests at different spots on the metal sheet, derived within a close area. The average value of these tests were
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22

Mohr, Thomas Campion. "A study of the microstructural basis for the strength and toughness properties of water-quenched and air-cooled HSLA-100, HSLA-100 with increased copper, and a ULCB steel." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/26797.

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23

Collins, Clair Louise. "Analytical electron microscopy of HSLA steels prepared using a focused ion beam system." Thesis, University of Glasgow, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.412940.

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24

Chakrabarti, Debalay. "Development of bimodal grain structures and their effect on toughness in HSLA steel." Thesis, University of Birmingham, 2007. http://etheses.bham.ac.uk//id/eprint/989/.

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To understand the formation of bimodal ferrite grain structures (i.e. mixed coarse + fine grain sizes) in TMCR HSLA steel plates, as-continuously cast HSLA steel slabs with varying microalloying additions (Ti, Nb and V) were reheated to temperatures in the range 1000-1300 °C and deformed at 1110 °C and 980 °C temperatures in Gleeble 3500. The interdendritic segregation during continuous casting and the consequent inhomogeneous microalloying precipitate distributions (with interdendritic regions being the precipitate-rich regions) has resulted in severely bimodal austenite grain structures unde
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25

Failla, David Michael II. "Friction Stir Welding and Microstructure Simulation of HSLA-65 and Austenitic Stainless Steel." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1243969697.

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26

Kutil, Petr. "Studium plasticity svaru hlubokotažných plechů svařených technologií Laser-TIG." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443205.

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This thesis is focused on laser welding and hybrid laser-TIG welding. The first part contains a brief theoretical description of these technologies. Standard quality and plasticity tests of welded joint are also mentioned. The second, experimental part, centres on the study of plasticity of tailored blanks (made of different types of HSLA steel), that are welded with laser and laser-TIG technology. The aim of the thesis is to assess process parameters effect on weld suitability for following deep drawning operation. Based on the calculated and measured figures obtained from the experiment, the
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27

Pedersen, Jonas Hovde. "In situ strekkforsøk med EBSD karakterisering av HSLA-stål ved romtemperatur og -60 °C." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for materialteknologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-16316.

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Denne oppgaven har tatt for seg et 420 MPa HSLA st&#229;l. St&#229;let ble sveisesimulertfor &#229; oppn&#229; mikrostruktur tilsvarende grovkornet og interkritisk grovkornetHAZ. Interkritisk grovkornet HAZ ble oppn&#229;dd ved en tosyklus sveisesimuleringhvor materialet ble varmet opp til 1350 &#176;C og avkj&#248;lt med &amp;#916;&amp;#964;8-5 = 15s og deretter gjenoppvarmet til 780 &#176;C og avkj&#248;lt med &amp;#916;&amp;#964; 6-4 = 17s. Grovkornet HAZ ble oppn&#229;dd ved ensyklus sveisesimulering hvor materialet ble varmet opp til 1350 &#176;C og avkj&#248;lt med &amp;#916;&amp;#964; 8
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28

Seraiva, Ricky Arthur. "The study of GMA welds with different cover gas compositions on HSLA-100 steel." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA274857.

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Thesis (M.S. in Mechanical Engineering) Naval Postgraduate School, September 1993.<br>Thesis advisor(s): Alan G. Fox. Cover title: The study of single-pass GMA ... steel. "September 1993." Bibliography: p. 62. Also available online.
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29

Khoo, C. A. "Microstructure-mechanical property relationships in vanadium bearing high strength low alloy (HSLA) strip steels." Thesis, Swansea University, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637790.

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High Strength Low Alloy (HSLA) strip steels have extensive applications in the automotive industry, due to their excellent combination of strength, toughness and suitable formability characteristics. The purpose of the present study is to study the control of austenite grain size via second phase particle additions, based on titanium and combine titanium-vanadium microalloy additions. Processing of HSLA strips steels aims to produce a fine austenite grain size resulting in the subsequent formation of a fine primarily ferritic product. Two experimental titanium and titanium-vanadium HSLA grades
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30

Alghamdi, Faisal. "Mathematical modeling of mean flow stress (MFS) during hot strip rolling for HSLA steels." Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=123280.

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Based on experimental results using hot torsion, the effect of 'time gap', i.e. the time between roughing and finishing in a hot rolling schedule simulation, on mean flow stress (MFS) behavior for high-strength-low-alloyed (HSLA) steels was investigated. Two types of hot deformation were studied: an 'average' schedule with constant interpass time, in which each pass is identical but the temperature is decreasing at a constant rate throughout the rolling schedule simulation. In this type of schedule, two different interpass times of 5 and 30 seconds were used to study the influence of precipita
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31

Crook, Nolan Tracy. "Control of Post-Weld Fracture Toughness in Friction Stir Processed X-80 HSLA Steel." BYU ScholarsArchive, 2021. https://scholarsarchive.byu.edu/etd/9162.

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The present study investigates the fracture toughness of FSW X-80 HSLA steel welds. Weld cooling rate and peak temperature were varied among welds; indirectly manipulated through FSW travel speed, rpm, and weld preheat. Fracture toughness was tested according to ASTM 1820 standard along the weld centerline using surface-notched SEB specimen cooled to -40 °C. This study resulted in a reliable, repeatable process for generating friction stir welds with CTOD’s consistently above that of the original base metal. CTOD and microstructure of friction stir welds can be selected by controlling weld coo
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32

Park, Sung-Ho 1957. "Modelling and measurement of the continuous-cooling-precipitation kinetics of Nb(CN) in HSLA steels." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=70199.

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The addition of Nb significantly retards recovery and recrystallization through solute drag and precipitation pinning effects. It is important to describe the precipitation behaviour precisely because finely distributed precipitates retard the restoration process abruptly. The isothermal precipitation behaviour has been studied frequently. However, during industrial hot deformation processing, the temperature decreases continuously, so that isothermal data cannot be applied directly to predict the precipitation under these conditions. The focus of this study is therefore on the CCP (Continuous
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33

Suka, Akira. "Microstructure and mechanical properties of high copper HSLA-100 steel in 2-inch plate form." Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/23957.

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Approved for public release; distribution is unlimited<br>The microstructure and mechanical properties of highly welda ble high copper HSLA-100 steel in two-inch (50 mm) plate form were investigated in this work. The mechanical property data showed that the steel in the as-quenched and aged conditions not only met the mechanical property specifications of the Navy for HSLA (HY) 100 steels but also satisfied the requirements for HY-130 steels. Optical, scanning and transmission electron microscope studies of the as-quenched plate indicated that the microstructure was a mixture of lath marten
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34

Walser, David Jordan. "Investigating the Relationship Between High Temperature Flow Stress and Friction Stir Weldability in HSLA Steels." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/5943.

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The feed rate at which a defect free friction stir weld can be run (friction stir weldability) on an HSLA steel plate can vary widely between heats that meet the same specified physical properties. Consequently, every time a new heat of HSLA steel is obtained, exploratory welds must be run to determine the proper feed rate for that plate. Previous research suggests that the varying levels of alloying elements related to high temperature physical properties between the different heats causes the observed change in friction stir weldability. Because of this, it was hypothesized that the high tem
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35

Callister, D. R. "A study of fatigue crack propagation in quenched and tempered and controlled rolled HSLA steels." Thesis, Cranfield University, 1987. http://dspace.lib.cranfield.ac.uk/handle/1826/4444.

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A range of HSLA steels reflecting the two major processing routes, quench and tempering and controlled rolling, have been tested in fatigue to assess their potential wider application in the offshore Industry. The six steels chosen have a wide range of yield strenghts (470 to 690Nmm-2), fracture toughness (31 to 260J at -40°C) and carbon equivalent values (0.19 to 0.33). Fatigue testing has in general been carried out at low frequency (0.5Hz) and high load ratio (0.6) however some tests have been conducted at very low frequency (0.1Hz) and low load ratio (0.1). An in-air study was first used t
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36

Bengtsson, Linus. "Hållfasthetsvariationer i bandände hos varmvalsade höghållfasta stål." Thesis, Högskolan Dalarna, Materialvetenskap, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:du-999.

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Varmvalsade HSLA-stål (high strength low alloy) uppvisar normalt en lägre hållfasthet i sista änden av bandet. Denna s.k. ändeffekt har länge varit känd och flera undersökningar har genomförts för att utvärdera hur mycket de sistametrarna minskar i hållfasthet. Materialet som undersökts i detta examensarbete är Domex 700MC. DX 700MC är ett extra höghållfast kallformningsstål och dess typiska egenskaper är: • Utmärkt formbarhet i förhållande till sin höga hållfasthet. • God svetsbarhet • God slagseghet vid låg temperatur Materialet är varmvalsat och har en minsta sträckgräns längs valsriktninge
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37

Rickinson, N. "Characterisation of the metallurgical and thermo-mechanical properties of niobium HSLA steel during hot strip rolling." Thesis, Swansea University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.638666.

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Predictions of finishing stand loads in the hot strip mill require a precise understanding of the microstructural evolutionary changes occurring during and after deformation. In order to generate this understanding, it is important to use reliable and accurate techniques. Hence, suitable equipment was developed to produce a controlled testing medium. Single and double uni-axial compression testing was carried out on two steels: a niobium-bearing HSLA and a carbon manganese steel. Testing was carried out between 850°C, 950°C and 1050°C at strain rates of 0.01/s to 1/s, with true strain reductio
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38

Talekar, Anjali S. "Oxidation behavior of Ni-base superalloys and high strength low alloy (HSLA) steels at elevated temperatures." abstract and full text PDF (UNR users only), 2008. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3316371.

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39

Anderson, Danny. "Effect of the joint addition of aluminum and molybdenum on the precipitation and recrystallization in HSLA steels." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66207.

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40

Biglou, Jalal. "Dynamic recrystallization during strip rolling of HSLA steels and prediction of roll forces using artificial neural networks." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq22191.pdf.

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41

Wang, Kai. "A study of HSLA steels microalloyed with vanadium and titanium during simulated controlled rollling [i.e. rolling] cycles." Thesis, University of Canterbury. Mechanical Engineering, 2003. http://hdl.handle.net/10092/7521.

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Thermomechanical treatments involving recrystallisation controlled rolling process of hot rolling strip mills were simulated in a Gleeble-1500 testing machine. Five vanadium and one vanadium-titanium microalloyed HSLA steels were used for these simulations. Specimens of vanadium steels were heated to 1170°C to simulate slab reheating, prior to a 50% upset reduction at 1060°C, The specimens were then cooled rapidly to the simulated coiling temperatures of 950°C to 600°C and held for half an hour then air cooled to room temperature. Nitrogen analysis established that the maximum volume fraction
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42

Comerford, Lawrence Whitley. "A study of the microstructural basis for the strength and toughness properties of overaged HSLA-100 steel." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/28574.

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A certification program for the use of HSLA steel in ship construction is currently being funded by the U.S. Navy. Integral to this program is the characterization of the microstructure of the highly weldable HSLA-100 steel. In the present work, optical, scanning electron and transmission electron microscopy were employed to analyze the microstructural basis for the mechanical properties of as-quenched and tempered HSLA 100 steel in the form of 31.75 mm plate. The as-quenched microstructure contained bainite/martensite laths and a small amount of retained austenite. The strength and toughness
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43

Siradj, Eddy Sumarno. "Strain induced precipitation kinetics of Nb(Cn) in Nb-HSLA steel as a function of thermomechanical history." Thesis, University of Sheffield, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264438.

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44

Sanderson, Samuel C. "The Effect of Friction Stir Welding Process Parameters on Charpy V-Notch Impact Toughness in HSLA-65." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3745.

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HSLA-65 steel (6.4 mm thick) was friction stir welded at various welding speeds and spindle speeds. Varying weld parameters provided a range of heat inputs. Impact toughness was evaluated as a function of the different weld parameters and corresponding weld heat inputs. Charpy V-Notch (CVN) tests were conducted in parent material and at both the weld nugget centerline and heat-affected zone (HAZ) locations. The upper shelf CVN impact energy of the weld nugget was above that of the base metal for all weld parameters. The upper shelf impact toughness in the HAZ was largely unaffected by changing
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45

Rose, Scott Anthony. "The Effect of Cooling Rate of Friction Stir Welded High Strength Low Alloy Steel." BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/4181.

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The friction stir welding of steel has produced a hard zone in several different alloys. Despite its detrimental effects on weld toughness, the reasons behind neither its formation nor a method of reducing its size or effects have been explored. Recent advances in process control allow for direct heat input control, which combined with the use of backing plates of different thermal conductivity allows for an expansion of the process window. These control methods also affect the HAZ cooling rate by providing greater range (a 60% increase compared to a fixed backing plate) and control (five weld
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46

Vesga, Rivera Wilson. "An evaluation of the structural integrity of HSLA steels exposed in simulated flue-gases under dynamic conditions for anthropogenic CO2 transport." Thesis, Cranfield University, 2014. http://dspace.lib.cranfield.ac.uk/handle/1826/9652.

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Carbon capture and storage (CCTS) is a transitional technology offering a nearterm method of mitigating climate change. Pipelines are considered to be the most suitable systems for CCTS; however, structural integrity of pipeline has to be guaranteed in order for this technology to become a practical technical solution. The investigation detailed here is based on a systematic experimental approach to investigate the structural integrity of API X100, X60 and X70 steels exposed in simulated flue-gas under dynamic conditions. A core of the structured experiments through some methods such as aging
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47

Tovee, John-Paul. "Microstructural influence on the effects of forward and reverse mechanical deformation in HSLA X65 and X80 linepipe steels." Thesis, University of Birmingham, 2014. http://etheses.bham.ac.uk//id/eprint/5171/.

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Five API grade steels designed for linepipe applications produced using different processing routes and with varying microstructures were studied against differences in work hardening and work softening behaviour obtained from mechanical data. The rolling history and wt % additions of alloying elements will determine how the microstructures perform under reverse deformation schedules commonly seen during large diameter linepipe fabrication as steels can undergo work softening in the reverse direction of deformation, otherwise known as the Bauschinger effect. The Bauschinger effect is known to
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48

Jiang, Sen. "Springback investigations." Connect to this title online, 1997. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1108144497.

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49

Comineli, Osvaldo Guilherme. "The influence of cooling rate and microalloying conditions of Ti and Nb on the hot ductility of HSLA steels." Thesis, City University London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266374.

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50

Gardiola, Bruno Esling Claude Humbert Michel. "Etude de propriétés mécaniques d'aciers HSLA obtenus par CSP, en relation avec les textures, microstructures et changements de phase." Metz : Université Metz, 2008. ftp://ftp.scd.univ-metz.fr/pub/Theses/2002/Gardiola.Bruno.SMZ0217.pdf.

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