热处理工艺对核电厂承压设备用高强钢板性能影响的研究

Study on Effect of Heat Treatment Process on Properties of High Strength Steel Plate for Pressure Vessel in Nuclear Power Plant

阐述了热处理工艺对一种核电厂承压设备用高强钢板性能影响的研究。在不同淬火工艺参数+不同回火工艺参数情况下对高强钢板进行热处理,然后进行拉伸试验和夏比冲击试验,并进行钢板微观组织观察和试样断口分析。结果表明,在不同的热处理工艺条件下,该种钢板的强度和韧性表现出了一定的变化规律。经920℃/(30~60) min淬火+635℃/(120~240) min回火,在此条件下进行热处理后,钢板可获得优良的综合性能,微观组织主要以回火索氏体为主,并均匀分布着细小的碳化物。拉伸试样断口和冲击试样断口主要是以韧窝状为主,进一步证明钢板具有良好的韧性。

The influence of the heat treatment process on the performance of high strength steel plate for a nuclear power plant was discussed. High-strength steel plates were heat-treated under different quenching process parameters + different tempering process parameters, followed by tensile test and Charpy impact test. The steel plate microstructure observation and sample fracture analysis were also performed. The results show that the strength and toughness of the steel plate are changed under different heat treatment conditions. After 920 ℃/(30-60) min quenching + 635 ℃/(120-240) min tempering, the steel plate can obtain excellent comprehensive performance after heat treatment under this condition. The microstructure is mainly tempered sorbite, and fine carbides are evenly distributed. The tensile sample fracture and impact sample fracture are mainly dimple, which show better toughness.