晶界工程处理对304奥氏体不锈钢力学性能的影响  

Effect of grain boundary engineering processing on mechanical properties of 304 austenite stainless steel

作　　者：姚顺语 马凤仓[1] 刘平[1] 刘新宽[1] 张柯[1] YAO Shunyu;MA Fengcang;LIU Ping;LIU Xinkuan;ZHANG Ke(School of Materials and Chemistry,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学材料与化学学院,上海200093

出　　处：《有色金属材料与工程》2023年第5期28-35,共8页Nonferrous Metal Materials and Engineering

基　　金：国家自然科学基金资助项目(51771119);上海市自然科学基金资助项目(17ZR1419600)。

摘　　要：晶界工程是改善晶界特性以提高抗晶间退化能力的一种可行方法,能有效提高Σ重位点阵晶界的比例。研究基于304奥氏体不锈钢,通过控制不同的热机械加工工艺,以获得更高的Σ重位点阵晶界,优化晶界特征分布,利用电子背散射衍射技术分析不同样品的微观结构,通过室温拉伸试验研究晶界类型对304型奥氏体不锈钢力学性能的影响。结果表明,经过晶界工程处理的样品,其伸长率能得到一定程度的提升。分析断口微观形貌、平均施密特因子、泰勒因子得出,晶界工程处理能使得304奥氏体不锈钢基体内的第二相杂质减少、微观区域应变分布更均匀、滑移系统的激活过程更容易发生。Grain boundary engineering is considered as a feasible method to improve the grain boundary characteristics to increase the resistance to intergranular degradation.It can effectively increase the ratio of theΣcoincidence site lattice boundary(CSL).This study is based on 304 austenitic stainless steel material which control different thermo-mechanical processes to obtain higherΣCSL boundaries and optimize the grain boundary character distribution technology.Electron back scattering diffraction is used to analyze the microstructure of different samples.The effect of grain boundaries on the mechanical properties was studies by tensile tests at room temperature.The results show that the tensile elongation can be improved to a certain extent with GBE treat samples.By analyzing the fracture microstructure,average Schmid factor and Taylor factor.It is concluded that GBE treatment can reduce the impurities of the second phase in the matrix,makes the strain distribution more uniform in the microzone and let the activation process of the slip system easier to happen.

关 键 词：晶界工程 奥氏体不锈钢 重位点阵晶界 力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]