材料工程2017，Vol.45Issue(10)：132-137,6.DOI:10.11868/j.issn.1001-4381.2016.000130
304奥氏体不锈钢晶间腐蚀敏感性的非线性超声表征
Nonlinear Ultrasonic Characterization for Intergranular Corrosion Susceptibility of 304 Austenitic Stainless Steel
摘要
Abstract
The variation law of nonlinear ultrasonic parameters for the samples sensitized at 650℃ for 2,6,10h was discussed using nonlinear ultrasonic testing technique and XRD pattern as well as mi-crostructure.The results indicate that normalized nonlinear parameters(β/β0 )of the samples show a monotonous growth trend with the increase of the sensitized time,and normalized nonlinear parame-ters(β/β0 )of the samples sensitized with 2,6,10h increase to 28%,32% and 43% respectively com-pared with that of the base material,meaning that it is feasible to use nonlinear parameter to charac-terize the sensitivity degree.It is analyzed that the mismatch between the carbide (Cr23 C6 )precipita-ted on the grain boundary and the austenitic matrix causes the local strain fields which interfere with the propagation of ultrasonic wave in the solid sample.In addition,the increment of precipitation phase exacerbates further the distortion of the ultrasonic with prolonging of the sensitization time.关键词
不锈钢/敏化/非线性超声/晶间腐蚀Key words
stainless steel/sensitization/nonlinear ultrasound/intergranular corrosion分类
矿业与冶金引用本文复制引用
侯天宇,李萍,陈雷,赵杰,李廷举..304奥氏体不锈钢晶间腐蚀敏感性的非线性超声表征[J].材料工程,2017,45(10):132-137,6.基金项目
国家自然科学基金联合基金重点资助项目(51134013) （51134013）
国家自然科学基金资助项目(51171037) （51171037）
2016NSFC-山西煤基低碳联合基金重点资助项目(U1610256) （U1610256）
