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通过显微组织观察、拉伸和冲击试验、硬度测试等研究了高温回火温度对4330V钢组织及性能的影响。结果表明,4330V钢经880℃油淬560~650℃回火后的组织均为回火索氏体+片状或块状铁素体+碳化物;钢在620℃回火后具有优良的强韧性匹配;560℃回火后,室温强度和布氏硬度达到最大,冲击吸收能量则最低,而650℃回火后则反之。随着回火温度升高,4330V钢的抗拉强度、屈服强度、硬度逐渐下降,冲击吸收能量逐渐升高。
The effects of high temperature tempering temperature on microstructure and properties of 4330V steel were studied by microstructure observation, tensile and impact test, hardness test and so on. The results show that the microstructure of 4330V steel after tempering from 560 ℃ to 650 ℃ at 880 ℃ is tempered sorbite + lamellar or massive ferrite + carbide; the steel has excellent strength after tempering at 620 ℃ Toughness match; After tempering 560 ℃, the room temperature strength and Brinell hardness reached the maximum, the impact energy absorption is the lowest, while the tempering at 650 ℃ after the contrary. With the increase of tempering temperature, the tensile strength, yield strength and hardness of 4330V steel gradually decrease, and the impact absorption energy increases gradually.