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利用显微组织观察及力学性能测试等实验方法,研究了回火温度(610～650℃)对28CrMo47V钢组织及性能的影响。研究表明:610℃回火时,28CrMo47V钢的回火组织中完全保留了马氏体针叶形态,随回火温度升高组织中马氏体针叶形态逐渐减少,并在650℃回火后完全消失,得到回火索氏体;回火温度的变化亦显著影响钢材的性能,随回火温度升高,钢材的屈服强度及抗拉强度呈明显下降趋势,而冲击韧度显著提高;630℃回火时因组织的弥散强化及细晶强化可使28CrMo47V钢达到一个优良的强韧化综合效果。
The effects of tempering temperature (610 ~ 650 ℃) on microstructure and properties of 28CrMo47V steel were studied by means of microstructure observation and mechanical properties testing. The results show that when the tempering temperature is 610 ℃, the martensite conformation of the 28CrMo47V steel remains completely in the tempered microstructure. With the tempering temperature increasing, the morphology of the martensite cones gradually decreases and the tempering of the martensite at 650 ℃ Completely disappeared, get tempered sorbite; tempering temperature changes also significantly affect the performance of steel, with the tempering temperature, steel yield strength and tensile strength decreased significantly, while the impact toughness increased significantly; 630 ℃ tempering due to the organization of the dispersion strengthening and fine grain strengthening can 28CrMo47V steel to achieve an excellent overall strength and ductility.