<strong>1Cr22Mn16N</strong>高氮奥氏体不锈钢塑性变形连接中界面组织演化及愈合机制

doi:10.11900/0412.1961.2023.00015

金属学报

2024, Vol. 60

Issue (7): 915-925 DOI: 10.11900/0412.1961.2023.00015

研究论文

本期目录 | 过刊浏览

1Cr22Mn16N高氮奥氏体不锈钢塑性变形连接中界面组织演化及愈合机制

杨瑞泽¹^,²^,³, 翟汝宗¹^,², 任少飞¹^,², 孙明月¹^,²(

), 徐斌¹^,², 乔岩欣³(

), 杨兰兰³

1 中国科学院金属研究所沈阳材料科学国家研究中心沈阳 110016
2 中国科学院金属研究所中国科学院核用材料与安全评价重点实验室沈阳 110016
3 江苏科技大学材料科学与工程学院镇江 212003

Evolution and Healing Mechanism of 1Cr22Mn16N High Nitrogen Austenitic Stainless Steel Interface Microstructure During Plastic Deformation Bonding

YANG Ruize¹^,²^,³, ZHAI Ruzong¹^,², REN Shaofei¹^,², SUN Mingyue¹^,²(

), XU Bin¹^,², QIAO Yanxin³(

), YANG Lanlan³

1 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3 School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China

引用本文:

杨瑞泽, 翟汝宗, 任少飞, 孙明月, 徐斌, 乔岩欣, 杨兰兰. 1Cr22Mn16N高氮奥氏体不锈钢塑性变形连接中界面组织演化及愈合机制[J]. 金属学报, 2024, 60(7): 915-925.
Ruize YANG, Ruzong ZHAI, Shaofei REN, Mingyue SUN, Bin XU, Yanxin QIAO, Lanlan YANG. Evolution and Healing Mechanism of 1Cr22Mn16N High Nitrogen Austenitic Stainless Steel Interface Microstructure During Plastic Deformation Bonding[J]. Acta Metall Sin, 2024, 60(7): 915-925.

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摘要:

为解决高氮奥氏体不锈钢焊接难题，以高氮奥氏体不锈钢1Cr22Mn16N为实验材料，采用塑性变形连接技术实现了1Cr22Mn16N的连接。通过OM、EBSD和TEM等手段研究了不同变形参数下的连接界面组织演化，讨论了界面愈合机理，并采用拉伸实验评估了连接接头的结合强度。研究结果表明，随着变形量的增加和变形温度的升高，连接界面的结合程度显著提高。当变形温度达到1200℃，变形量为40%时，连接界面结合较好，其拉伸性能达到基体同等水平。在塑性变形连接过程中，由于热力耦合促使原始粗大的晶粒细化，在连接界面处发生不连续动态再结晶，随后再结晶晶粒核心通过消耗变形晶粒中的应变储能发生长大，诱导连接界面弯曲，晶界迁移；与此同时，位错在应力的作用下堆积和缠结，在界面附近的变形晶粒内形成了大量亚晶界，随着应力的增大发生了连续动态再结晶，使亚晶界转变成大角度晶界，促进了连接界面愈合。高氮奥氏体不锈钢1Cr22Mn16N塑性变形连接过程中，在连续动态再结晶与不连续动态再结晶的协同作用下实现了界面的连接。

关键词 ：高氮奥氏体不锈钢, 塑性变形连接, 动态再结晶

Abstract：

High nitrogen austenitic stainless steels (HNASSs) are widely used for their good wear resistance and high strength, plasticity, and corrosion resistance. Among these steels, 1Cr22Mn16N HNASS improves the cost effectiveness because of the incorporation of a N element in place of the expensive Ni element. In addition, the overall mechanical properties of the steel are further improved because of the solid solution-strengthening effect of the N element. However, the traditional welding methods such as arc welding, tungsten gas shielded welding, and friction stir welding are not suitable for 1Cr22Mn16N HNASS welding because of the different solubility of N in the liquid and solid phases. N easily spills out during the welding process, which considerably degrades the mechanical properties of the welded joints. Therefore, a new welding method needs to be explored to solve the problems in 1Cr22Mn16N welding. In this work, the bonding technology of plastic deformation was introduced to solve the poor performance problems of 1Cr22Mn16N HNASS welded joints. The experiments were conducted through the Glebble 3500 thermomechanical simulation in the temperature range of 1050-1250^oC and a strain range of 10%-40% with a strain rate of 0.1 s^-1. The microstructure evolution of the bonding interface was characterized and investigated using OM, EBSD, and TEM; the interface healing mechanism was discussed, and the bonding strength of the joint was evaluated by tensile test. The results show that the bonding level of the interface substantially increases with the increase in deformation and temperature. When the deformation temperature reached 1200^oC and the strain reached 40%, the mechanical properties of the bonding interface reached up to the same level as the matrix. During the process of deformation, discontinuous dynamic recrystallization (DDRX) occurred at the interface because of thermomechanical coupling; meanwhile, dislocations accumulated and entanglement occurred under the action of stress, forming a large number of subgrain boundaries within the original grain boundaries near the interface, which, lead to continuous dynamic recrystallization (CDRX). The healing of the interface was achieved by the synergistic effect of CDRX and DDRX.

Key words： high-nitrogen austenitic stainless steel plastic deformation bonding dynamic recrystallization

收稿日期: 2023-01-09

ZTFLH:

TG406

基金资助:国家重点研发计划项目(2018YFA0702900);国家自然科学基金项目(52173305);国家自然科学基金项目(52101061);国家自然科学基金项目(52233017);国家自然科学基金项目(52203384)

通讯作者: 孙明月，mysun@imr.ac.cn，主要从事特殊钢与大锻件材料及先进控形控性技术研究;
乔岩欣，yxqiao@just.edu.cn，主要从事金属腐蚀与防护研究

Corresponding author: SUN Mingyue, professor, Tel: (024)83971018, E-mail: mysun@imr.ac.cn;

作者简介: 杨瑞泽，男，1997年生，硕士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2023.00015 或 https://www.ams.org.cn/CN/Y2024/V60/I7/915

图1 实验方法及样品尺寸示意图

图2 1Cr22Mn16N高氮奥氏体不锈钢(HNASS)显微组织反极图(IPF)

图3 应变速率为0.1 s-1、变形量为20%、不同变形温度下1Cr22Mn16N HNASS界面处的OM像(a) 1050oC (b) 1100oC (c) 1150oC (d) 1200oC (e) 1250oC

图4 1200℃时不同变形量的1Cr22Mn16N HNASS界面处的OM像和平均晶粒尺寸图

图5 20%和40%变形连接接头与母材的室温拉伸曲线

图6 20%和40%变形连接接头与母材的断口形貌

图7 塑性变形温度1200℃时，不同变形量下界面组织的IPF、局部取向差(GND)图及对应的晶粒取向(GOS)图

图8 不同变形量样品的大小角度晶界占比图

图9 变形温度为1200℃、变形量20%下界面微观组织的TEM像

图10 塑性变形连接界面愈合机理示意图

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