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利用光学显微镜、透射电子显微镜和力学性能测试,研究了不同淬火温度(850~1050℃)和回火温度(100~750℃)对PH13-8Mo钢微观组织和力学性能的影响。结果表明,经过淬火后形成的含有高密度位错的细小板条马氏体是该钢具有较高强韧性的组织基础,在500℃左右回火时,与基体共格的细小弥散分布的NiAl沉淀相是该钢出现强度峰值的主要原因。NiAl沉淀相在450℃左右回火时开始析出,高于510℃回火时因NiAl相长大而逐渐与基体失去共格关系,高于700℃回火时NiAl相溶解。PH13-8Mo钢经925℃淬火和510℃回火可获得良好的综合性能。
The effects of different quenching temperature (850 ~ 1050 ℃) and tempering temperature (100 ~ 750 ℃) on the microstructure and mechanical properties of PH13-8Mo steel were studied by optical microscope, transmission electron microscopy and mechanical properties tests. The results show that the fine lath martensite containing high density dislocations formed after quenching is the microstructure of the steel with high strength and toughness. When tempered at about 500 ℃, the finely dispersed NiAl precipitates Phase is the main reason for the steel peak intensity. Precipitation of NiAl precipitates begins to precipitate at about 450 ℃. When the temperature is higher than 510 ℃, the NiAl phase gradually loses its coherent relationship with the matrix when it is tempered. When the temperature is higher than 700 ℃, the NiAl phase dissolves. PH13-8Mo steel by 925 ℃ quenching and tempering 510 ℃ get good overall performance.