P92钢焊接接头蠕变损伤的非线性超声检测研究

Nonlinear ultrasonic detection of creep damage in welded joints of P92 steel

为解决P92钢焊接接头蠕变损伤的无损检测问题,该文选用温度为650℃、施加应力为95 MPa的加速试验方法,制作不同蠕变时间的试样,对P92钢焊接接头进行蠕变性能试验。采用非线性超声波技术和金相检测对蠕变试样焊接接头各区域进行研究。结果表明:P92钢焊接接头母材、热影响区以及焊缝区域的非线性超声二次谐波幅值在蠕变试验后都呈上升趋势,在热影响区中的增加速率要快于其在母材和焊缝中,P92钢焊接接头热影响区非线性二次谐波参数的变化与蠕变损伤严重程度存在对应关系。该文为开展P92钢焊接接头蠕变损伤的无损检测工程应用打下了坚实的基础。

In order to solve the problem of non-destructive testing of P92 steel welded joint creep damage,in this paper,the creep properties of the P92 steel welded joint are tested by means of an accelerated test method with a temperature of 650℃ and a stress applied of 95 MPa.Nonlinear ultrasonic technology and metallographic testing were used to study the welding joint areas of creep samples.The results showed that the secondary harmonic amplitude of the welding joint base,thermal influence area and weld area of the T/P92 steel welded joint showed an upward trend after the creep test.The increase rate of the second harmonic in the thermal impact zone was faster than that in the parent and weld areas.The change of nonlinear parameters in the thermal impact zone of the welded joint of P92 steel had a corresponding relationship with the creep damage degree.This paper lays a solid foundation for developing the engineering application of P92 steel welded joint creep damage detection.