ANALYSING EFFECT OF QUENCHING AND TEMPERING INTO MECHANICAL PROPERTIES AND MICROSTRUCTURE OF 304-SS WELDED PLATES

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2022-09-24 DOI:10.36547/ams.28.3.1556

Saurabh Dewangan, S. Chattopadhyaya

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引用次数: 3

Abstract

The present work deals with analysis of mechanical performance and microstructural appearance of quenched and tempered SS-304 welded joints made by MIG welding technique. Since welding involves a critical solidification and thereby lots of internal stresses. Hence, heat treatment becomes important for removing stresses. In the present work, two SS-304 welded plates were heat treated. First plate was in quenched condition, and another was in tempered state. In both the plates, mechanical properties like tensile strength, impact strength, and hardness were analyzed. In addition, the microstructural attributes of base metal, heat affected zone and welded joints in both the welded plates were analyzed through optical microscope. The fractography analysis was also carried out in this study to get information about failure characteristics of samples after tensile testing. A significant change in mechanical properties, such as, 150% improvement in toughness, 7% reduction in weld-zone hardness, 3% improvement in yield strength and 6% reduction in ultimate tensile strength was obtained after tempering work. Also, the tempering process had reformed the grain structure by creating twins in base metal, and lathy δ ferrite & γ+δ lamella in HAZ. The martensite formed in quenched specimen had been completely recovered into fine γ+δ matrix.

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调质对304-s焊接板力学性能和组织的影响分析

本文对采用MIG焊技术调质后的SS-304焊接接头的力学性能和显微组织形貌进行了分析。由于焊接涉及到临界凝固，因此会产生大量的内应力。因此，热处理对于消除应力变得很重要。本文对两块SS-304焊接板进行了热处理。第一块板处于淬火状态，另一块板处于回火状态。在这两种板材中，分析了拉伸强度、冲击强度和硬度等机械性能。此外，通过光学显微镜对两种焊接板的母材、热影响区和焊接接头的显微组织属性进行了分析。本研究还进行了断口分析，以获得试样在拉伸试验后的破坏特征信息。回火处理后，合金的力学性能发生了显著变化，韧性提高150%，焊接区硬度降低7%，屈服强度提高3%，极限抗拉强度降低6%。回火过程中基体形成孪晶，热影响区形成条状δ铁素体和γ+δ片层。淬火试样中形成的马氏体完全恢复为细小的γ+δ基体。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.