HSM-SS钢的淬回火工艺与组织和力学性能研究

Study on Quenching and Tempering Technology and Microstructure and Properties of HSM-SS Steel

采用微合金化与热处理相结合的方法制备了HSM-SS模具钢,研究了奥氏体化温度和回火温度对HSM-SS模具钢显微组织和力学性能的影响,并与传统热作模具钢进行了对比分析。结果表明,HSM-SS钢的奥氏体化温度不宜超过1120℃;HSM-SS钢在回火过程中出现了二次硬化,随着回火温度的升高,热作模具钢的硬度都表现为先增加而后降低的趋势,在回火温度<600℃时,具有较好的抗回火软化性能;在奥氏体化温度为1080℃、回火温度为640℃时,HSM-SS钢相较于DIEVAR、HTCS-130、CR7V和H13模具钢具有更好的强韧性配比和抗回火软化性能。

HSM-SS die steel was prepared by microalloying and heat treatment. The effects of austenitizing temperature and tempering temperature on the microstructure and mechanical properties of HSM-SS die steel were studied. The results were compared with those of traditional hot working die steels. The results show that, the austenitizing temperature of HSM-SS steel should not exceed 1120 ℃. The secondary hardening of HSM-SS steel occurs during tempering. With the increase of tempering temperature, the hardness of hot working die steel increases at first and then decreases. When the tempering temperature is less than 600 ℃, it has good tempering and softening resistance. When the austenitizing temperature is 1080 ℃ and the tempering temperature is 640 ℃, HSM-SS steel has better strength and toughness ratio and tempering and softening resistance than DIEVAR, HTCS-130, CR7V and H13 die steel.