Evaluation of Sensitization Behaviors on the Heat-Affected Zone of Austenitic Stainless Steel Weld by Thermal Cycles of Actual Multi-pass Welding

IF 3.3 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Metals and Materials International Pub Date : 2024-05-03 DOI:10.1007/s12540-024-01679-9
Gidong Kim, Junho Lee, Seunghyun Kim, Yongjoon Kang, Jun-Yong Park, Sang-Woo Song
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Abstract

The sensitization behavior of the welding heat affected zone (HAZ) in austenitic stainless steels (SSs) was investigated through simulated thermal cycles emulating actual multi-pass welding processes using the Gleeble simulator. The tests were performed with austenitic SSs, considering carbon contents, heat input, and distance from the fusion line to determine the thermal cycle conditions of the HAZ. Higher carbon content led to increased sensitization (degree of sensitization, DOS) values, while the influence of the thermal cycle in the final weld pass was that even though it was rapidly heated to over 1000 °C and cooled at a rapid rate, the DOS value decreased due to partial carbide dissolution and chromium diffusion. Therefore, effective management of the final thermal cycle in the HAZ contributes to improved intergranular stress corrosion cracking resistance. Even with prolonged exposure of the HAZ to the sensitization region, the discovery that corrosion resistance improves when the final heating cycle reaches 1000 °C underscores the importance of HAZ heat cycle management and provides valuable insights for materials engineering and industrial applications.

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通过实际多道焊接的热循环评估奥氏体不锈钢焊缝热影响区的敏化行为
通过使用 Gleeble 模拟器模拟实际多道焊接过程的热循环,研究了奥氏体不锈钢(SSs)焊接热影响区(HAZ)的敏化行为。测试使用奥氏体不锈钢进行,考虑了碳含量、输入热量和与熔合线的距离,以确定 HAZ 的热循环条件。碳含量越高,敏化(敏化度,DOS)值越高,而最后焊道热循环的影响是,即使快速加热到 1000 ℃ 以上并快速冷却,由于部分碳化物溶解和铬扩散,DOS 值也会降低。因此,有效管理热影响区的最终热循环有助于提高抗晶间应力腐蚀开裂性能。即使 HAZ 长期暴露在敏化区,当最终加热循环达到 1000 ℃ 时,耐腐蚀性也会得到改善,这一发现强调了 HAZ 热循环管理的重要性,并为材料工程和工业应用提供了宝贵的见解。
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来源期刊
Metals and Materials International
Metals and Materials International 工程技术-材料科学:综合
CiteScore
7.10
自引率
8.60%
发文量
197
审稿时长
3.7 months
期刊介绍: Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.
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