P91钢高温热损伤的二次谐波评价  

Second-harmonic evaluation to the thermal damage of P91 steel

作　　者：孙锦中[1,2] 马世伟[1] 蔡叶青[3] 韦习成[3] 

机构地区：[1]上海大学机电工程与自动化学院,上海200072 [2]上海电力学院电子信息工程系,上海200090 [3]上海大学材料学院,上海200072

出　　处：《声学技术》2015年第6期510-514,共5页Technical Acoustics

基　　金：国家自然科学基金资助项目(61171145)

摘　　要：P91钢是重要的核电承压钢结构材料,对其进行早期损伤评价具有重要意义。基于非线性超声理论,对P91钢不同温度的热损伤试样进行了非线性超声检测试验,逐级加大激励电压,基波幅度平方和二次谐波幅度呈现出良好线性关系,对基波和二次谐波进行频谱分析得到非线性系数,结果显示随着热处理温度的升高,非线性系数逐渐增大,可用于对这类材料热损伤进行有效评价。P91 steel is an important bearing steel material in nuclear power. It is meaningful to make early damage evaluation for P91 steel. A nonlinear ultrasonic test is implemented to P91 steel specimens heat-treated at different temperatures based on the theory of nonlinear ultrasound. The square of the fundamental amplitude and the Second-harmonic amplitude have a good linear relationship as progressively increasing the excitation voltage. The nonlinear parameter is calculated by analyzing the spectrums of fundamental and second-harmonic. The result shows that the nonlinear parameter increases with heat treatment temperature. It can be used for early thermal damage evaluation of such materials.

关 键 词：非线性超声 二次谐波 热损伤 P91钢 

分 类 号：TG115[金属学及工艺—物理冶金]