Si、Mn元素对奥氏体不锈钢微观组织和拉伸性能的影响  

Effect of Si and Mn on Microstructure and Tensile Properties of Austenitic Stainless Steel

作　　者：陆成旭 易昊钰 梁田[2] 王旻 薛海龙[1] 马颖澈[2] 刘奎[2] Lu Chengxu;Yi Haoyu;Liang Tian;Wang Min;Xue Hailong;Ma Yingche;Liu Kui(School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,China;CAS Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;China Nuclear Power Technology Research Institute,Shenzhen 518000,China)

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110870 [2]中国科学院金属研究所核用材料与安全评价重点实验室,辽宁沈阳110016 [3]中广核研究院有限公司,广东深圳518000

出　　处：《稀有金属材料与工程》2021年第1期187-194,共8页Rare Metal Materials and Engineering

基　　金：辽宁省自然科学基金(2019-BS-248)。

摘　　要：为提高奥氏体不锈钢耐蚀性,合金中可同时加入Si、Mn元素,提高合金氧化膜形成能力,同时增加奥氏体基体稳定性,但Si、Mn的添加还能够对合金的冷变形组织和力学性能产生影响。本研究设计了不同硅、锰含量的奥氏体不锈钢,采用SEM、EPMA以及TEM等方法表征合金显微组织形貌,采用室温拉伸分析合金的力学性能。结果表明,Si质量分数由1.0%提高至2.0%,20%冷变形合金组织中变形孪晶体积分数由4.98%增加至8.33%,合金屈服强度由620 MPa提高至682 MPa,延伸率基本保持不变;Mn质量分数由1.5%提高至2.0%,变形孪晶体积分数由8.33%减少至7.22%,屈服强度由682 MPa降低至627 MPa,延伸率由16.0%增加至21.3%;添加Si元素,合金中孪晶数量增加,合金强度提高并保持塑性;添加Mn元素,合金中孪晶数量减少,强度降低塑性增强。Si and Mn are usually added into austenitic stainless steels to improve their corrosion resistance by improving the oxide film forming ability and increasing the stability of austenite matrix.However,the addition of Si and Mn significantly affects the microstructure and mechanical properties of the cold-worked material.In this study,austenitic stainless steels with different Si and Mn contents were designed.The microstructure of the alloys is characterized by SEM,EPMA,and TEM,and the mechanical properties are evaluated by tensile tests at room temperature.As Si content increases from 1.0wt%to 2.0wt%,the volume fraction of deformation twins increases from 4.98%to 8.33%,the yield strength increases from 620 MPa to 682 MPa,and the elongation basically remains constant;as Mn content increases from 1.5 wt%to 2.0wt%,the volume fraction of the deformation twins decreases from 8.33%to 7.22%,the yield strength decreases from 682 MPa to 627 MPa,and the elongation increases from 16.0%to 21.3%.Si addition increases the quantity of deformation twins in the alloy,improves the strength of the alloy and maintains plasticity;Mn addition reduces the number of the deformation twins in the alloy,reduces the strength of the alloy and enhances plasticity.

关 键 词：金属材料 奥氏体不锈钢 拉伸性能 显微组织 变形孪晶 

分 类 号：TG142[一般工业技术—材料科学与工程] TL341[金属学及工艺—金属材料]