Elongation enhancement strategies for AISI 430 stainless steel welded joints: insights from molecular dynamics analysis

IF 3.8 2区工程技术 Q1 ENGINEERING, MECHANICAL

Acta Mechanica Sinica Pub Date : 2024-08-15 DOI:10.1007/s10409-024-24019-x

Gongbo Bian (, ), Feng Liu (, ), Tingting Zhang (, ), Mengting Ran (, ), Xiaoyan Xue (, ), Dinglu Wu (, ), Wenxian Wang (, )

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Abstract

AISI 430 ferritic stainless steel is popular in modern industry, while conventional welding methods with filler metals produce welded joints with tensile strength (586 MPa) and elongation (7.35%), which is insufficient to meet the growing engineering requirements. In this work, the elongation of the joint is doubled (15.11%) while yield strength remains unchanged after post-weld heat treatment (PWHT). Microstructural analysis of heat affected zone (HAZ) reveals the transformation process between equiaxed ferrite, intergranular martensite, and intragranular acicular martensite in the welded joint at 750 °C and 800 °C. Additionally, molecular dynamics simulations demonstrate the impact of various types of martensite on single crystals of ferritic stainless steel under tension. The results indicate that intergranular martensite and acicular martensite demonstrate transgranular fracture, while granular martensite exhibits intragranular fracture. Intergranular martensite and granular martensite are distributed near high-strain regions within the crystal, whereas acicular martensite is concentrated at the grain boundaries, away from the high-strain regions. The comparison of hardening parameters for different types of martensite reveals that granular martensite (58.98) has higher ductility than acicular martensite (97.40) and intergranular martensite (111.54). These findings are valuable for developing advanced stainless steel welded joints that balance high ductility and strength, meeting modern engineering demands.

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AISI 430 不锈钢焊接接头的伸长增强策略：分子动力学分析的启示

AISI 430 铁素体不锈钢在现代工业中很受欢迎，而传统的填充金属焊接方法产生的焊接接头抗拉强度（586 兆帕）和伸长率（7.35%）不足以满足日益增长的工程要求。在这项工作中，焊后热处理（PWHT）后，接头的伸长率增加了一倍（15.11%），而屈服强度保持不变。热影响区（HAZ）的微观结构分析表明，在 750 °C 和 800 °C 温度下，焊接接头中的等轴铁素体、晶间马氏体和晶内针状马氏体之间发生了转变。此外，分子动力学模拟证明了各种类型的马氏体在拉伸条件下对铁素体不锈钢单晶体的影响。结果表明，晶间马氏体和针状马氏体表现为跨晶断裂，而粒状马氏体表现为晶内断裂。晶间马氏体和粒状马氏体分布在晶体内高应变区域附近，而针状马氏体则集中在晶界，远离高应变区域。对不同类型马氏体的硬化参数进行比较后发现，粒状马氏体（58.98）比针状马氏体（97.40）和晶粒间马氏体（111.54）具有更高的延展性。这些发现对开发先进的不锈钢焊接接头很有价值，可兼顾高延展性和高强度，满足现代工程需求。

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

Acta Mechanica Sinica 物理-工程：机械

CiteScore

5.60

自引率

20.00%

发文量

1807

审稿时长

4 months

期刊介绍： Acta Mechanica Sinica, sponsored by the Chinese Society of Theoretical and Applied Mechanics, promotes scientific exchanges and collaboration among Chinese scientists in China and abroad. It features high quality, original papers in all aspects of mechanics and mechanical sciences. Not only does the journal explore the classical subdivisions of theoretical and applied mechanics such as solid and fluid mechanics, it also explores recently emerging areas such as biomechanics and nanomechanics. In addition, the journal investigates analytical, computational, and experimental progresses in all areas of mechanics. Lastly, it encourages research in interdisciplinary subjects, serving as a bridge between mechanics and other branches of engineering and the sciences. In addition to research papers, Acta Mechanica Sinica publishes reviews, notes, experimental techniques, scientific events, and other special topics of interest. Related subjects » Classical Continuum Physics - Computational Intelligence and Complexity - Mechanics