Tracking heat-affected zone cracking susceptibility in standard and modified heat treated IN 738 superalloy welds

机译：跟踪标准和改进的IN 738高温合金焊缝中的热影响区裂纹敏感性

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The conditions influencing the phenomenon of heat affected zone (HAZ) cracking during tungsten inert gas (TIG) welding of a gamma-prime (γ') precipitation strengthened nickel-base superalloy, IN 738, is discussed here. The discussion is reinforced with the dependence of the cracking on particle size variation of the γ' precipitates and base alloy hardness. Microstructural analysis of the magnitude of HAZ cracking in the alloy indicates that while resistance to cracking susceptibility is poor in the standard heat treatment (SHT) condition, the modified heat treated (MHT) alloy exhibits significantly improved resistance to HAZ cracking. The improvement in resistance to HAZ cracking in the MHT alloy is attributed to the lower hardness of the alloy which permits stress relaxation in the base alloy compared to the SHT alloy. In contrast to what is expected based on the recommended manufacturer SHT procedure, preweld microstructural modification presents a viable way of limiting cracking susceptibility in TIG welded IN 738 superalloy.

机译：在此讨论了影响γ′沉淀沉淀强化镍基高温合金IN 738的钨极惰性气体（TIG）焊接期间热影响区（HAZ）裂纹现象的条件。裂纹对γ'析出物的粒径变化和基体合金硬度的依赖性进一步加强了讨论。合金中HAZ裂纹强度的微观结构分析表明，尽管在标准热处理（SHT）条件下抗裂纹敏感性的能力较差，但改性热处理（MHT）合金对HAZ裂纹的耐受性却大大提高。 MHT合金对HAZ裂纹的抵抗力的提高归因于该合金较低的硬度，与SHT合金相比，它可以降低基础合金的应力。与根据推荐的制造商SHT程序得出的预期结果相反，预焊微结构改性是限制TIG焊接IN 738高温合金开裂敏感性的可行方法。

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来源
《High performance and optimum design of structures and materials》|2014年|37-47|共11页
会议地点 Ostend(BE)
作者
L. O. Osoba; M. O. H. Amuda;
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作者单位

Materials Development and Processing Research Group, Department of Metallurgical and Materials Engineering, University of Lagos, Nigeria;

Materials Development and Processing Research Group, Department of Metallurgical and Materials Engineering, University of Lagos, Nigeria;

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会议组织
原文格式 PDF
正文语种 eng
中图分类
关键词
joining; superalloy; HAZ cracking;

机译：加盟高温合金HAZ开裂;

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专利

1. 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 [J] . O.T. Ola, O.A. Ojo, M.C. Chaturvedi Philosophical magazine: structure and properties of condensed matter . 2014,第28a30期

机译：关于开发一种新的预焊接热处理工艺以防止镍基IN 738高温合金的热影响区（HAZ）液化开裂的研究
2. Effect of filler alloys on heat-affected zone cracking in preweld heat-treated IN-738 LC gas-tungsten-arc welds [J] . K. Banerjee, N. L. Richards, M. C. Chaturvedi Metallurgical and Materials Transactions A . 2005,第7期

机译：填充合金对预焊热处理IN-738 LC气钨弧焊中热影响区开裂的影响
3. Effect of Filler Alloys on Heat-Affected Zone Cracking in Preweld Heat-Treated IN-738 LC Gas-Tungsten-Arc Welds [J] . K. BANERJEE, N.L. RICHARDS, M.C. CHATURVEDI Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science . 2005,第7期

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4. Tracking heat-affected zone cracking susceptibility in standard and modified heat treated IN 738 superalloy welds [C] . L. O. Osoba, M. O. H. Amuda International conference on high performance and optimum design of structures and materials . 2014

机译：738超合金焊缝中处理标准和改性热处理的热影响区域开裂敏感性
5. Heat Affected Zone Cracking of Allvac 718Plus Superalloy during High Power Beam Welding and Post-weld Heat Treatment. [D] . Idowu, Oluwaseun Ayodeji. 2010

机译：大功率梁焊接和焊后热处理过程中，Allvac 718Plus合金的热影响区开裂。
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8. Stress-Relief Cracking Susceptibility of a New Ferritic Steel - Part I: Single-Pass Heat-Affected Zone Simulations;Welding Journal Research Suppliment [R] . Nawrocki, J. G. , Dupont, J. N. , Robino, 1999

机译：新型铁素体钢的应力消除裂纹敏感性 - 第一部分：单程热影响区模拟;焊接期刊研究补充

Tracking heat-affected zone cracking susceptibility in standard and modified heat treated IN 738 superalloy welds

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