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Dissertations / Theses on the topic '17-4 PH Stainless Steel'

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1

Alnajjar, Michella. "Corrosion properties of 17-4 PH martensitic stainless steel obtained by additive manufacturing." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEM035.

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Ce travail de thèse porte sur la corrosion de l'acier inoxydable à durcissement structural 17-4 PH élaboré par fabrication additive par fusion sélective laser (SLM).Nous avons montré que la microstructure de l'acier 17-4 PH fabriqué par SLM est ferritique, contrairement à l'acier corroyé qui a une microstructure martensitique typique. Ceci résulte des vitesses de refroidissement et de chauffage très élevées (105-106 K/s) qui empêchent la formation de l'austénite et conduisent à une rétention complète de ferrite δ issue de la solidification.Nous avons mené une étude comparative de corrosion éle
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2

Wang, Danqi. "LOW-TEMPERATURE GAS-PHASE CARBURIZING AND NITRIDING OF 17-7 PH STAINLESS STEEL." Case Western Reserve University School of Graduate Studies / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=case1386165240.

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3

Freitas, Willian Januário de. "Influência da atmosfera de sinterização na dureza e resistência à corrosão do aço inoxidável 17-4 PH conformado a partir do processo de moldagem de pós por injeção." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/18/18158/tde-11062015-171314/.

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O processo de moldagem de pós injeção é utilizado para a fabricação de peças de geometrias complexas e com alto volume de produção. Em aplicações ortodônticas e médicas, nas quais são requeridas elevadas durezas e resistências à corrosão, o aço inoxidável 17-4 PH é utilizado aplicando-se aquela técnica de conformação. A atmosfera de sinterização é responsável pelo controle das reações químicas que ocorrem durante a densificação do material e são fundamentais para a qualidade final do produto. O objetivo deste trabalho foi avaliar a influência da atmosfera de sinterização na dureza e resistênci
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4

Hasni, Abdellatif. "Etude des principales proprietes chimiques des solutions eau-chlorure de magnesium : application a la comprehension des phenomenes de corrosion sous contrainte de l'acier inoxydable austenitique 17-12-mo." Paris 6, 1988. http://www.theses.fr/1988PA066287.

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Etude du ph d'equilibre et du domaine d'acidite des solutions aqueuses de mgcl::(2) et de leur dependance vis-a-vis de la concentration et de la temperature des solutions. Analyse du comportement en corrosion sous tension de l'acier 17cr-12ni-2mo dans les solutions aqueuses de mgcl::(2) en fonction des differents parametres (concentration, temperature)
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5

Zhang, Tao. "The Effects of Ball Burnishing for Aerospace Blade Material 17-4 PH Steel." University of Toledo / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1384971374.

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6

Montgomery, Colt James. "The Effect of Alloys, Powder, and Overhanging Geometries in Laser Powder Bed Additive Manufacturing." Research Showcase @ CMU, 2017. http://repository.cmu.edu/dissertations/1112.

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Additive manufacturing (AM) shows great promise for the manufacturing of next-generation engineering structures by enabling the production of engineered cellular structures, overhangs, and reducing waste. Melt-pool geometry prediction and control is critical for widespread implementation of laser powder bed processes due to speed and accuracy requirements. The process mapping approach used in previous work for different alloys and additive manufacturing processes is applied to the selective laser powder bed process for IN625 and 17-4 stainless steel alloys. The ability to predict the resulting
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7

Lin, Se-Dong, and 林世東. "The Stress Corrosion Cracking of 17-4 PH Stainless Steel." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/76176487806294384652.

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8

Hsu, Kuei-Chang, and 許貴彰. "High-Temperature Fatigue Crack Growth Behavior of 17-4 PH Stainless Steel." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/07280891886150898098.

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博士<br>國立中央大學<br>機械工程研究所<br>95<br>High-temperature fatigue crack growth (FCG) behavior was investigated for 17-4 PH stainless steels in three heat-treated conditions, namely unaged “Condition A,” peak-aged “Condition H900,” and overaged “Condition H1150.” Baseline FCG behavior was studied at a load ratio of 0.1, a frequency of 2 Hz and temperatures ranging from 300 to 500oC. The fatigue crack growth rates (FCGRs) of Condition H1150 were increased with an increase in temperature from 300 to 500oC. However, for Conditions A and H900 tested at 500oC, the FCGRs were lower than the lower-temperat
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9

Chen, Po-Han, and 陳柏翰. "Improvements in Mechanical Properties and Machinability of MIM 17-4 PH Stainless Steel." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/42937604726733221176.

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碩士<br>臺灣大學<br>材料科學與工程學研究所<br>98<br>Abstract Metal injection molded (MIM) 17-4 PH stainless steels are wildly used in the aircraft and medical industries due to the good mechanical properties and corrosion resistance. The 17-4 PH stainless steel is typically sintered in the dual phase region of δ+ γ under vacuum or hydrogen. Since nitrogen provides solution strengthening and dissociated ammonia (DA) is widely used in continuous furnaces in the industry, the 17-4PH was sintered in DA in this study and its effect on mechanical properties and corrosion resistance was investigated. Results showed t
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10

CHENG, WEI-HANG, and 鄭葦杭. "Microstructure and Mechanical Properties of Selective Laser Melted 17-4 PH Stainless Steel." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/npy45n.

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碩士<br>國立臺北科技大學<br>材料科學與工程研究所<br>107<br>In this study, 17-4 precipitation hardening stainless steels are made by selective laser melting (SLM). According to the ASTM A564, H900 (482°C for 1 hour), H1025 (551°C for 4 hours), and H1150 (621°C for 4 hours) aging heat treatments were proceeded after 1040°C solution treatment. Experimental results show that the microstructure of H900 treated specimens is mainly martensite, and the Vickers hardness and tensile strength are improved from 353 HV0.3 and 994 MPa in the as-built state to 428 HV0.3 and 1361 MPa, while the elongation decreases from 21.6% to
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11

Pa, Pai Shan, and 巴白山. "A Study of the Characteristic of Manufacturing Processes of 17-4 PH Stainless Steel." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/cqvcjr.

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12

Wu, Jui-Hung, and 吳瑞鴻. "HIGH-TEMPERATURE MECHANICAL PROPERTIES, FATIGUE, AND FRACTURE BEHAVIOR OF 17-4 PH STAINLESS STEEL." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/65312923348958044486.

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博士<br>國立中央大學<br>機械工程研究所<br>91<br>High-temperature mechanical and fatigue properties have been investigated for 17-4 PH stainless steel in three different conditions, namely, unaged (Condition A), peak-aged (H900) and overaged (H1150) conditions. The high-temperature yield strength of each condition was decreased with an increase in temperature from 200 to 500oC except for Condition A tested at 400oC with a longer hold-time where strengths were superior to the lower temperature ones due to a precipitation-hardening effect. Given an aged alloy at a temperature higher than the initial age-treat
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13

Jyun-YuLin and 林俊宇. "Effect of Heat Treatment on Hydrogen Induced Cracking Behavior of 17-4 PH Stainless Steel." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/rgcxt3.

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碩士<br>國立成功大學<br>材料科學及工程學系<br>107<br>The microstructure and mechanical properties of 17-4 precipitation hardening (PH) stainless steel (SS) can be modified by heat treatment associated with the precipitation of copper-rich particles in the matrix. Tempering at 480 ℃ for 1h resulted in an increase in hardness and tensile strength but at the expense of high susceptibility to hydrogen induced cracking (HIC). Hydrogen is likely to be absorbed and trapped in interstitial lattice sites, dislocation cores, grain boundaries and incoherent interfaces (commonly associated with inclusions), etc., which ca
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14

Cheng, Chao-Yang, and 鄭朝陽. "Assessment of Aging Treatment on Mechanical Properties and Damaging Phenomena of 17-4 PH Stainless Steel by Small Punch Test." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/99448031061847328232.

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碩士<br>遠東科技大學<br>機械工程研究所<br>103<br>To evaluate the fracture toughness of 17-4 stainless alloy, a simply Small Punch Test process (with thin slice 0.5mm specimen) was proposed in this study. The effect of the aging temperature on the strain deformation and fracture toughness was obtained with the detailed fractography, the plastic deformation and load–displacement experi -mental results. A series of experimental procedures have been performed to evaluate the effect of the aging precipitation on the load–deflection curves, the fracture strain and fracture toughness of the specimens, the results
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15

Yueh-TingLin and 林岳霆. "Effects of Solution Composition and Degree of Cathodic Polarization on Hydrogen Induced Cracking and Hydrogen Embrittlement Behavior of 17-4 PH Stainless Steel." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/fwh7x8.

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碩士<br>國立成功大學<br>材料科學及工程學系<br>107<br>In this study, the susceptibility to HIC of 17-4 PH stainless steel (SS) in various aqueous solution and under cathodic polarization was investigated. The experimental results showed that the amount of hydrogen absorbed strongly depended on solution pH under constant applied potential condition, which increased with decreasing solution pH. The addition of Na2S2O3 or NH4SCN caused a further increase in hydrogen absorption, where the former was more significant than the latter. The roles of the additives on hydrogen absorption were elucidated. The experimental
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16

Hsu, Tzu-Hou, and 許子厚. "Effects of energy density and post heat-treatment on martensitic phase fraction and mechanical properties of selective laser melted 17-4 PH stainless steel." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/k99wa3.

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17

HUNG, CHUNG-CHING, and 洪仲慶. "Moldeling And Experimental Analysis Of Black Area And Weld Lines For The Guide Bush Of 17-4 PH Stainless Steel In The Metal Injection Molding." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/c9tsf5.

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碩士<br>修平科技大學<br>精密機械與製造科技碩士班<br>105<br>The guide bush is the critical part of the sampling instrμments for medical minimally invasive surgery. The guide bush is made of stainless steel series and machined by metal injection molding. The common defects during metal injection molding process include short shot, jet phenomenon, crack, encapsulation, weld line, burr, warp, and black mark of which the weld lines and black marks have the most significant effect on the guide bush function. The defects will result in poor guidance by reducing mechanical strength and surface depression. Therefore, re
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18

Yu, B. L., and 余秉隆. "Hydrogen Embrittlement of 17-4 Precipitatipn Hardening Stainless Steel." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/57256111522248393964.

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碩士<br>國立海洋大學<br>材料工程研究所<br>90<br>Hydrogen permeation rate and diffusivity in H900 specimen is lower than in SA specimen of 17-4 PH stainless steel. Hydrogen trapped in the interface between copper rich precipitates and matrix and caused brittle fracture in hydrogen environment. Hydrogen diffusion path along grain and grain boundary in all specimens was observed by MPT.
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19

Wilkins, Jocelyn Victoria. "Repeatability of the Mechanical Properties of Additively Manufactured Precipitation Hardened 17% Chromium - 4% Nickel Stainless Steel." Master's thesis, 2021. https://hdl.handle.net/10216/140415.

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