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Journal articles on the topic 'Heat-affected zone liquation'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Chaturvedi, Mahesh C. "Liquation Cracking in Heat Affected Zone in Ni Superalloy Welds." Materials Science Forum 546-549 (May 2007): 1163–70. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.1163.

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Precipitation hardened nickel-based superalloys are widely used in aero and industrial gas turbine engines due to their excellent high temperature strength and remarkable hot corrosion resistance. A drawback of many of these alloys is that they are very difficult to weld due to their high susceptibility to heat affected zone (HAZ) cracking, both during welding and post weld heat treatments (PWHT). Weld cracking in many of these alloys has been attributed mostly to constitutional liquatioin of grain boundary NbC precipitates. however, HAZ cracking has been observed in carbon-free superalloys as

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2

Jeong, Ye-Seon, Kyeong-Min Kim, Hyungsoo Lee, Seong-Moon Seo, and Eun-Joon Chun. "Evaluation and Control of Liquation Cracking Susceptibility for CM247LC Superalloy Weld Heat-Affected Zone via Visualization-Based Varestraint Test." Korean Journal of Metals and Materials 59, no. 7 (2021): 445–58. http://dx.doi.org/10.3365/kjmm.2021.59.7.445.

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The metallurgical aspects of weld cracking in Ni-based superalloys remain relatively unexplored in existing research. The present study performed comprehensive metallurgical and manufactural investigations into the weldability of an Ni-based superalloy, CM247LC, from the viewpoint of the liquation cracking behavior and its susceptibility. Metallurgical solutions to suppress the liquation-cracking susceptibility were derived via the visualization-based Varestraint test, and the possibility of liquation crack-free welding was explored by employing pre-weld heat treatments and laser beam welding.

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3

Jeong, Ye-Seon, Kyeong-Min Kim, Uijong Lee, Hyungsoo Lee, Seong-Moon Seo, and Eun-Joon Chun. "Evaluation of Liquation Cracking Behavior and Susceptibility in Heat-Affected Zone of CM247LC Superalloy Welds for Turbine Blade Application." Korean Journal of Metals and Materials 58, no. 12 (2020): 875–86. http://dx.doi.org/10.3365/kjmm.2020.58.12.875.

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In this study, the weldability of the as-cast CM247LC superalloy for turbine blade applications was metallurgically evaluated in terms of its hot cracking behavior and susceptibility. For this purpose, a real blade was manufactured using a directional solidification casting process, and gas tungsten arc welding was performed at the tip and cavity of the upper blade. Hot cracking was confirmed in the heat-affected zone (HAZ) of gas tungsten arc welds, and the cracks were characterized as liquation cracks, since a cobble or dropletshaped crack surface consistent with a liquid film was clearly co

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4

Rakoczy, Łukasz, Fabian Hanning, Joel Andersson, Małgorzata Grudzień-Rakoczy, Rafał Cygan, and Anna Zielińska-Lipiec. "Microstructure evolution of the Gleeble-simulated heat-affected zone of Ni-based superalloy." MATEC Web of Conferences 287 (2019): 06002. http://dx.doi.org/10.1051/matecconf/201928706002.

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The formation of liquation cracking in a simulated heat affected zone of René108 is reported. The stress controlled thermo-mechanical experiments were carried out on a Gleeble®3800 testing system. The base alloy was lost-wax cast and then solution treated and aged. Light and scanning electron microscopy of this material revealed high volume fraction of γ' precipitates in the dendrite arms and residual eutectic γ/γ' islands in the interdendritic areas. As a result of short-term exposure to high homologous temperature, the volume fraction of γ' phase was significantly decreased due to the dissol

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5

Chen, Kai-Cheng, Tai-Cheng Chen, Ren-Kae Shiue, and Leu-Wen Tsay. "Liquation Cracking in the Heat-Affected Zone of IN738 Superalloy Weld." Metals 8, no. 6 (2018): 387. http://dx.doi.org/10.3390/met8060387.

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6

Baeslack, W. A., and D. E. Nelson. "Morphology of weld heat-affected zone liquation in cast alloy 718." Metallography 19, no. 3 (1986): 371–79. http://dx.doi.org/10.1016/0026-0800(86)90024-8.

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7

Saha, Dulal Chandra, InSung Chang, and Yeong-Do Park. "Heat-affected zone liquation crack on resistance spot welded TWIP steels." Materials Characterization 93 (July 2014): 40–51. http://dx.doi.org/10.1016/j.matchar.2014.03.016.

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8

Messler, R. W., and L. Li. "Weld heat affected zone liquation cracking in type 347 stainless steel." Science and Technology of Welding and Joining 2, no. 2 (1997): 43–52. http://dx.doi.org/10.1179/stw.1997.2.2.43.

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9

Raza, Hurtig, Asala, Andersson, Svensson, and Ojo. "Influence of Heat Treatments on Heat Affected Zone Cracking of Gas Tungsten Arc Welded Additive Manufactured Alloy 718." Metals 9, no. 8 (2019): 881. http://dx.doi.org/10.3390/met9080881.

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The weldability of additive manufactured Alloy 718 was investigated in various heat-treated conditions. The microstructure of the base metal was examined in detail in order to understand the effect of different pre-weld heat treatments; i.e., solution, solution and aging, and hot isostatic pressing. After welding, the variation in total crack lengths, maximum crack length and the total number of cracks in the heat affected zone (HAZ) were used as criteria for the cracking susceptibility of each material condition where wrought Alloy 718 was used as the reference material. Selective laser melti

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10

Singh, Sukhdeep, Fabian Hanning, and Joel Andersson. "Influence of Hot Isostatic Pressing on the Hot Ductility of Cast Alloy 718: The Effect of Niobium and Minor Elements on the Liquation Mechanism." Metallurgical and Materials Transactions A 51, no. 12 (2020): 6248–57. http://dx.doi.org/10.1007/s11661-020-06004-8.

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AbstractThe influence of two hot isostatic pressing (HIP) treatments on liquation behavior was investigated and compared with regard to the extent of heat-affected zone liquation cracking in cast Alloy 718. The extent of liquation was seen to increase after HIP treatment at 1190 °C due to solute changes caused by the homogenization of Nb, which contributed to extensive grain boundary melting. The HIP treatment at 1120 °C exhibited lower liquation with contributions from particle liquation of the Laves phase and constitutional liquation of NbC carbides. This was also reflected in a lower ductil

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11

Singh, Sukhdeep, and Joel Andersson. "Heat-Affected-Zone Liquation Cracking in Welded Cast Haynes® 282®." Metals 10, no. 1 (2019): 29. http://dx.doi.org/10.3390/met10010029.

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Varestraint weldability testing and Gleeble thermomechanical simulation of the newly developed cast form of Haynes® 282® were performed to understand how heat-affected-zone (HAZ) liquation cracking is influenced by different preweld heat treatments. In contrast to common understanding, cracking susceptibility did not improve with a higher degree of homogenization achieved at a higher heat-treatment temperature. Heat treatments with a 4 h dwell time at 1120 °C and 1160 °C exhibited low cracking sensitivity, whereas by increasing the temperature to 1190 °C, the cracking was exacerbated. Nanoseco

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12

Baeslack, W. A., S. Ernst, and J. C. Lippold. "Heat-affected zone liquation cracking in a cobalt-free low-expansion superalloy." Journal of Materials Science Letters 7, no. 11 (1988): 1204–8. http://dx.doi.org/10.1007/bf00722338.

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13

West, S. L., W. A. Baeslack, and T. J. Kelly. "Morphology of weld heat-affected zone liquation cracking in Ta-modified cast Alloy 718." Metallography 23, no. 3 (1989): 219–29. http://dx.doi.org/10.1016/0026-0800(89)90033-5.

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14

Ojo, O. A., Y. L. Wang, and M. C. Chaturvedi. "Heat affected zone liquation cracking in electron beam welded third generation nickel base superalloys." Materials Science and Engineering: A 476, no. 1-2 (2008): 217–23. http://dx.doi.org/10.1016/j.msea.2007.04.091.

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15

Chen, Yuan, Ke Zhang, Jian Huang, Seyed Reza Elmi Hosseini, and Zhuguo Li. "Characterization of heat affected zone liquation cracking in laser additive manufacturing of Inconel 718." Materials & Design 90 (January 2016): 586–94. http://dx.doi.org/10.1016/j.matdes.2015.10.155.

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16

Kazempour-Liasi, Hassan, Mohammad Tajally, and Hassan Abdollah-Pour. "Liquation cracking in the heat-affected zone of IN939 superalloy tungsten inert gas weldments." International Journal of Minerals, Metallurgy and Materials 27, no. 6 (2020): 764–73. http://dx.doi.org/10.1007/s12613-019-1954-y.

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17

Li, Shanlin, Kejian Li, Mengjia Hu, Yao Wu, Zhipeng Cai, and Jiluan Pan. "The Mechanism for HAZ Liquation of Nickel-Based Alloy 617B During Gas Tungsten Arc Welding." Metals 10, no. 1 (2020): 94. http://dx.doi.org/10.3390/met10010094.

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The mechanism for HAZ (heat-affected zone) liquation of alloy 617B during gas tungsten arc welding (GTAW) was investigated. Welding thermal simulation work was conducted to investigate the effects of thermal parameters (peak temperature, holding time, and thermal cycle numbers) on M23C6 carbides’ evolutionary behavior in nickel-based alloy 617B. OM (optical microscopy), SEM (scanning electron microscopy), TEM (transmission electron microscopy), and SIMS (secondary ion mass spectrometry) were employed to characterize HAZ carbides. It was found that the constitutional liquation of M23C6 carbides

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18

Karthik, G. M., G. D. Janaki Ram, and Ravi Sankar Kottada. "Heat-Affected Zone Liquation Cracking Resistance of Friction Stir Processed Aluminum-Copper Alloy AA 2219." Metallurgical and Materials Transactions B 48, no. 2 (2016): 1158–73. http://dx.doi.org/10.1007/s11663-016-0892-6.

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19

Baeslack, W. A., S. J. Savage, and F. H. Froes. "Laser-weld heat-affected zone liquation and cracking in a high-strength Mg-based alloy." Journal of Materials Science Letters 5, no. 9 (1986): 935–39. http://dx.doi.org/10.1007/bf01729281.

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20

Sasabe, Seiji. "Effect of Mn on welding liquation micro-cracking in heat affected zone of 6082 aluminum alloy." Journal of Japan Institute of Light Metals 60, no. 5 (2010): 213–19. http://dx.doi.org/10.2464/jilm.60.213.

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21

Ojo, O. A., and M. C. Chaturvedi. "Liquation Microfissuring in the Weld Heat-Affected Zone of an Overaged Precipitation-Hardened Nickel-Base Superalloy." Metallurgical and Materials Transactions A 38, no. 2 (2007): 356–69. http://dx.doi.org/10.1007/s11661-006-9025-1.

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22

Chang, Baohua, Shuo Yang, Guan Liu, Wangnan Li, Dong Du, and Ninshu Ma. "Influences of Cooling Conditions on the Liquation Cracking in Laser Metal Deposition of a Directionally Solidified Superalloy." Metals 10, no. 4 (2020): 466. http://dx.doi.org/10.3390/met10040466.

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Directionally solidified (DS) nickel-based superalloys are widely used in manufacturing turbine blades, which may fail due to wear and/or material loss during service. Laser metal deposition (LMD) has been considered to be a promising technology in repairing the damaged components thanks to the high temperature gradient formed, which is conducive to the growth of directional microstructure. Intergranular liquation cracking in the heat-affected zone (HAZ) has been one of the major problems in LMD of the DS superalloys. In this paper, the influences of two cooling conditions (conventional coolin

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23

Ojo, O. A. "Intergranular liquation cracking in heat affected zone of a welded nickel based superalloy in as cast condition." Materials Science and Technology 23, no. 10 (2007): 1149–55. http://dx.doi.org/10.1179/174328407x213323.

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24

Ilyushenko, R., and V. Nesterenkov. "Novel Technique for Joining of Thick Section Difficult-to-Weld Aluminium Alloys." Materials Science Forum 519-521 (July 2006): 1125–30. http://dx.doi.org/10.4028/www.scientific.net/msf.519-521.1125.

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One of the “show stoppers” in fusion welding of highly alloyed aerospace aluminium alloys is their susceptibility for liquation cracking in the weld heat-affected zone. Liquation cracking is a microscopic intergranular discontinuity, which occurs under the effect of welding thermal cycle and in the presence of stresses involved with the welding process. These intergranular discontinuities are often observed in welding of thick plates and extrusions, which usually have relatively coarse elongated grains, that are generally oriented parallel to each other. Friction Stir Welding (FSW) is a low te

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25

Ziewiec, A. "Study of the Weldability of Austenitic PH Steel for Power Plants." Archives of Metallurgy and Materials 61, no. 2 (2016): 1109–14. http://dx.doi.org/10.1515/amm-2016-0186.

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Abstract The article presents the results of Transvarestraint test of a modern precipitation hardened steel X10CrNiCuNb18-9-3 with copper. For comparison, the results of tests of conventional steel without the addition of copper X5CrNi18-10 are presented. The total length of all cracks and the maximum length of cracks were measured. The study of microstructure (LM, SEM) showed that the austenitic stainless steel X10CrNiCuNb18-9-3 is very prone to hot cracking. After performing the Transvarestraint tests three types of cracks were observed: solidification cracks occurring during crystallization

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26

Ola, Oyedele T., Olanrewaju A. Ojo, Priti Wanjara, and Mahesh C. Chaturvedi. "Crack-Free Welding of IN 738 by Linear Friction Welding." Advanced Materials Research 278 (July 2011): 446–53. http://dx.doi.org/10.4028/www.scientific.net/amr.278.446.

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Inconel 738 (IN 738), like other precipitation-hardened nickel-base superalloys that contain a substantial amount of Al and Ti, is very difficult to weld due to its high susceptibility to heat-affected zone (HAZ) cracking during conventional fusion welding processes. The cause of this cracking, which is usually intergranular in nature, has been attributed to the liquation of various phases in the alloy, subsequent wetting of the grain boundaries by the liquid and decohesion across one of the solid-liquid interfaces due to on-cooling tensile stresses. In the present work, crack-free welding of

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27

Vanek, J. "Evaluation of the liquation cracking susceptibility of the heat affected zone of fully austenitic Ni-Fe-Cr alloys." Welding International 4, no. 3 (1990): 241–43. http://dx.doi.org/10.1080/09507119009447716.

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28

Radhakrishnan, B., and R. G. Thompson. "The effect of weld Heat-Affected zone (HAZ) liquation kinetics on the hot cracking susceptibility of alloy 718." Metallurgical and Materials Transactions A 24, no. 6 (1993): 1409–22. http://dx.doi.org/10.1007/bf02668209.

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29

Yan, Fei, Sang Liu, Chongjing Hu, Chunming Wang, and Xiyuan Hu. "Liquation cracking behavior and control in the heat affected zone of GH909 alloy during Nd: YAG laser welding." Journal of Materials Processing Technology 244 (June 2017): 44–50. http://dx.doi.org/10.1016/j.jmatprotec.2017.01.018.

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30

LI, Zhuoxin. "Progress on Effect of Processes and Microelements on Liquation Cracking of Weld Heat-affected Zone of Nickel-based Alloy." Journal of Mechanical Engineering 52, no. 6 (2016): 37. http://dx.doi.org/10.3901/jme.2016.06.037.

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31

Karthik, G. M., G. D. Janaki Ram, and Ravi Sankar Kottada. "Use of Friction Stir Processing for Improving Heat-Affected Zone Liquation Cracking Resistance of a Cast Magnesium Alloy AZ91D." Metallurgical and Materials Transactions B 48, no. 6 (2017): 3270–80. http://dx.doi.org/10.1007/s11663-017-1100-z.

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32

Hong, Hyun Uk, In Soo Kim, Baig Gyu Choi, et al. "The Potential of HAZ Property Improvement through Control of Grain Boundary Character in a Wrought Ni-Based Superalloy." Materials Science Forum 654-656 (June 2010): 488–91. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.488.

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The effects of grain boundary serration on grain coarsening and liquation behavior in simulated weld heat-affected-zone (HAZ) of a wrought Ni-based superalloy Alloy 263 have been investigated. Recently, the present authors have found that grain boundary serration occurs in the absence of adjacent coarse γ' particles or M23C6 carbides when a specimen is direct-aged with a combination of slow cooling from solution treatment temperature to aging temperature. This serration leads to a change in grain boundary character as special boundary based on the crystallographic analysis demonstrating that t

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33

K, RamReddy, Nandha Kumar E, Jeyaraam R., Janaki Ram G.D., and Subramanya Sarma V. "Effect of grain boundary character distribution on weld heat-affected zone liquation cracking behavior of AISI 316Ti austenitic stainless steel." Materials Characterization 142 (August 2018): 115–23. http://dx.doi.org/10.1016/j.matchar.2018.05.020.

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34

Bai, Guanshun, Yiyi Li, and Shanping Lu. "Localized Liquation and Resultant Pitting Corrosion Behavior of Welding Coarse-Grained Heat-Affected Zone in Niobium-Stabilized Austenitic Stainless Steel." Journal of The Electrochemical Society 165, no. 11 (2018): C722—C731. http://dx.doi.org/10.1149/2.0091811jes.

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35

Hong, Hyun Uk, In Soo Kim, Baig Gyu Choi, Young Soo Yoo, and Chang Yong Jo. "On the Role of Grain Boundary Serration in Simulated Weld Heat-Affected Zone Liquation of a Wrought Nickel-Based Superalloy." Metallurgical and Materials Transactions A 43, no. 1 (2011): 173–81. http://dx.doi.org/10.1007/s11661-011-0837-2.

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36

Funamoto, Takao, Mitsuo Kato, Tomohiko Shida, Satoshi Kokura, Hisanao Kita, and Takamitsu Nakazaki. "Welding of non magnetic steel. (Report 4). Mechanism of grain boundary liquation in weld heat-affected zone of 14% Mn steel." QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 7, no. 1 (1989): 88–93. http://dx.doi.org/10.2207/qjjws.7.88.

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37

Hsieh, Rong-Iuan, Shyi-Chin Wang, and Horng-Yih Liou. "A study on the formation of liquation cracks in the weld heat-affected zone of HY-80 quenched and tempered steel." Journal of Materials Science 29, no. 9 (1994): 2328–34. http://dx.doi.org/10.1007/bf00363422.

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38

Guo, H., M. C. Chaturvedi, N. L. Richards, and G. S. McMahon. "Interdependence of character of grain boundaries, intergranular segregation of boron and grain boundary liquation in simulated weld heat-affected zone in inconel 718." Scripta Materialia 40, no. 3 (1999): 383–88. http://dx.doi.org/10.1016/s1359-6462(98)00427-8.

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39

Luo, X., S. Yoshihara, K. Shinozaki, H. Kuroki, and M. Shirai. "Theoretical analysis of grain boundary liquation in heat affected zone of Inconel 718 alloy. Study of laser weldability of Ni‐base superalloys (3rdReport)." Welding International 14, no. 11 (2000): 865–73. http://dx.doi.org/10.1080/09507110009549284.

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40

Hong, Hyun-Uk, June-Woo Choi, Sang-Hyun Bae, et al. "Effects of Serrated Grain Boundary Structures on Boron Enrichment and Liquation Cracking Behavior in the Simulated Weld Heat-Affected Zone of a Ni-Based Superalloy." Journal of the Korean Welding and Joining Society 31, no. 3 (2013): 31–38. http://dx.doi.org/10.5781/kwjs.2013.31.3.31.

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41

Ola, O. T., O. A. Ojo, and M. C. Chaturvedi. "On the development of a new pre-weld thermal treatment procedure for preventing heat-affected zone (HAZ) liquation cracking in nickel-base IN 738 superalloy." Philosophical Magazine 94, no. 29 (2014): 3295–316. http://dx.doi.org/10.1080/14786435.2014.956838.

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42

Lertora, Enrico, Chiara Mandolfino, and Carla Gambaro. "Mechanical Behaviour of Inconel 718 Thin-Walled Laser Welded Components for Aircraft Engines." International Journal of Aerospace Engineering 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/721680.

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Nickel alloys are very important in many aerospace applications, especially to manufacture gas turbines and aero engine components, where high strength and temperature resistance are necessary. These kinds of alloys have to be welded with high energy density processes, in order to preserve their high mechanical properties. In this work, CO2laser overlap joints between Inconel 718 sheets of limited thickness in the absence of postweld heat treatment were made. The main application of this kind of joint is the manufacturing of a helicopter engine component. In particular the aim was to obtain a

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43

Swathi Kiranmayee, M., Abhay Kumar Jha, Sushant K. Manwatkar, P. Ramesh Narayanan, K. Sreekumar, and Parameshwar Prasad Sinha. "Microstructural Characterisation of AA2219 Weldments." Materials Science Forum 710 (January 2012): 638–43. http://dx.doi.org/10.4028/www.scientific.net/msf.710.638.

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Aluminium alloy AA 2219 has been selected for fabrication of both earth storable and cryogenic propellant tanks of launch vehicles due to its high specific strength, compatibility with liquid propellants, good resistance to stress corrosion cracking (SCC), excellent properties at cryogenic temperatures and good fabricability including weldability. Propellant tanks are fabricated by welding sheets in T87 and rings in T851 temper conditions. Microstructural characterization was carried out on the weldments with sheet-sheet and sheet-forge configuration using optical microscopy and electron micro

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44

Khalil, Asmaa M., Irina S. Loginova, Andrey V. Pozdniakov, Ahmed O. Mosleh, and Alexey N. Solonin. "Evaluation of the Microstructure and Mechanical Properties of a New Modified Cast and Laser-Melted AA7075 Alloy." Materials 12, no. 20 (2019): 3430. http://dx.doi.org/10.3390/ma12203430.

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The mechanical properties and microstructure of as-cast and homogenized AA7075 were investigated. This alloy was modified by adding transition elements 0.3%Sc + 0.5%Zr, 1%Ti + 0.2%B, and 1%Fe + 1%Ni for use in additive manufacturing applications. After adding Ti + B and Sc + Zr, the structure became uniform and finer with the formation of the Al3(Sc, Zr) and TiB2 phases. Coarse structures were obtained with the formation of an extremely unfavorable morphology, close to a needle-like structure when Fe + Ni was added. The mechanical properties of the modified alloys were increased compared to th

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45

du Toit, Madeleine, Patronica Letsoalo, and Heinrich Möller. "Fusion Welding of Rheocast Semi-Solid Metal (SSM) Processed Aluminium Alloy 7017." Solid State Phenomena 192-193 (October 2012): 161–66. http://dx.doi.org/10.4028/www.scientific.net/ssp.192-193.161.

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Near-net shape casting of wrought aluminium alloys has proven to be difficult due to a tendency towards hot tearing during cooling. Rheocasting, or semi-solid metal (SSM) processing followed by high pressure die casting (HPDC), has recently been shown to be an effective alternative to conventional die casting, yielding near-net shape wrought aluminium alloy castings with less risk of hot tearing. This casting process involves pouring the liquid metal into a processing cup, which is then transferred into a coil for induction stirring and simultaneous forced air cooling. When the metal reaches t

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46

Acoff, V. L., R. D. Griffin, and R. G. Thompson. "Characterization of constitutional liquid-film migration in Alloy 718." Proceedings, annual meeting, Electron Microscopy Society of America 52 (1994): 906–7. http://dx.doi.org/10.1017/s0424820100172267.

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Alloy 718 is a nickel-based superalloy which consists of an FCC solid solution of Ni, Fe, and Cr strengthened with γ″ precipitates. The composition of the alloy is shown in Table 1. It has excellent high temperature mechanical properties and oxidation resistance. However, Alloy 718 is susceptible to hot cracking in weld heat affected zones (HAZ) as a result of the formation of intergranular liquid. This metastable grain boundary liquid may be due to “constitutional liquation” of second phase particles, known as constitutional liquid film migration (CLFM). Radhakrishnan and Thompson report that

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47

Li, Qiuge, Xin Lin, Xinghua Wang, Haiou Yang, Menghua Song, and Weidong Huang. "Research on the Grain Boundary Liquation Mechanism in Heat Affected Zones of Laser Forming Repaired K465 Nickel-Based Superalloy." Metals 6, no. 3 (2016): 64. http://dx.doi.org/10.3390/met6030064.

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48

Guo, Shaoqing, and Xiaohong Li. "Numerical simulation of the liquating behavior of niobium carbide in heat-affected-zone during welding of a superalloy." Frontiers of Materials Science in China 1, no. 2 (2007): 203–9. http://dx.doi.org/10.1007/s11706-007-0036-7.

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49

Zhou, Wei, Aprilia Aprilia, and Chee Kong Mark. "Mechanisms of Cracking in Laser Welding of Magnesium Alloy AZ91D." Metals 11, no. 7 (2021): 1127. http://dx.doi.org/10.3390/met11071127.

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Abstract:

Considerable research has been carried out to study the laser welding of magnesium alloys. However, the studies are mainly devoted to butt welding, and there has been limited information in the published literature concerning the bead-on-plate laser welding of AZ91D, even though bead-on-plate welding is required for the repair of cast AZ91D parts with surface defects. In the present investigation, surface cracking of the weld metal was observed when an AZ91D magnesium alloy was bead-on-plate welded using the laser welding method. This paper presents the experimental results and analyses to sho

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Li, Huaxin, and T. K. Chaki. "Cracking in the Weld Heat-Affected Zone of COntinuously Cast Sheet and Ingot of Ni3Al." MRS Proceedings 213 (1990). http://dx.doi.org/10.1557/proc-213-919.

Full text

Abstract:

ABSTRACTWeldability is a key issue for successful applications of ductile Ni3Al in structural components. Here we report the results of an investigation of gas tungsten arc welding behaviors of continuously cast thin sheet and cast ingot of a Ni3Al alloy, known as IC-50, containing boron and zirconium. Cracking in heat-affected zone (HAZ) was prevalent in both types of specimens. Both in cast sheet and ingot, liquation cracking was observed to occur along the grain boundaries in HAZ. Microstructural studies showed that continuously cast thin sheet consisted of columnar grains along the thickne

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