17-4PH不锈钢热老化脆化的非线性超声检测评估

基金项目:

国家重点研发计划项目（2020YFB1901500）

详细信息

Evaluation of nonlinear ultrasonic testing for thermal aging embrittlement of 17-4PH stainless steel

摘要: 研究了400℃下，不同时效核电厂主蒸汽隔离阀备件阀杆的非线性超声和力学性能的变化规律。试验结果表明，在时效过程中，17-4PH不锈钢的冲击功降低，而布氏硬度、抗拉强度和屈服强度提高；硬度、拉伸性能与非线性超声表现出明显的关联性；非线性超声对时效过程中17-4PH不锈钢的显微组织变化敏感，可用来对17-4PH不锈钢进行无损评估表征。
- 17-4PH /
- 非线性超声 /
- 谐波 /
- 热老化
Abstract: The change of nonlinear ultrasonic and mechanical properties of the main steam isolation valve stem in a nuclear power plant at 400℃ for different aging time was studied. The results show that with the thermal aging time increasing, the impact energy of 17-4PH stainless steel decreases, while the Brinell hardness, tensile strength and yield strength increase. Hardness, tensile properties and nonlinear ultrasonic show a clear correlation. Ultrasonic nonlinear parameter is sensitive to the microstructure changes of 17-4PH stainless steel during the aging process, which can be used for nondestructive evaluation and characterization of 17-4PH stainless steel.
- 17-4PH /
- nonlinear ultrasonic /
- harmonic wave /
- thermal aging

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