利用光学显微镜、扫描电镜、能谱仪和X射线衍射仪等研究了不同淬火和回火工艺对新型镁合金压铸机用X20CoCrWMoV10-9热作模具钢显微组织和硬度的影响,以确定其热处理工艺.结果表明:该钢较佳的热处理工艺为840℃×8 h退火预处理+1 100℃×1 h淬火+700℃×2 h回火;该钢经较佳工艺处理后,其显微组织由回火马氏体、金属间化合物μ相和合金碳化物M23 C6、M6C组成;在1 100℃×1 h淬火后其硬度达到最大值51.5 HRC;在500～650℃回火时析出了较多弥散分布的金属间化合物和碳化物,具有较高的回火抗力和明显的二次硬化效应.
The effects of quenching and tempering processes on microstructure and hardness of X20CoCrWMoV10-9 hot-work die steel used in new magnesium alloy pressure die casting machine were studied by using the OM, SEM, EDS and XRD. Then the heat treatment process was determined. The results show that the optimized heat treatment of the steel was suggested that the steel was annealed at 840 ℃ for 8 h, then solutiontreated at 1 100 ℃ for 1 h and oil quenched, followed by aged at 700 ℃ for 2 h. The microstructure of the steel treated with the process was consisted of tempered martensite,intermetallics μ phase,carbide M23C6 and M6C.The hardness of the steel reached to 51. 5 HRC after quenched at 1 100 ℃ for 1 h. Due to the precipitation of intermetallics and alloy carbides in the steel during the tempering treatment at 550-650 ℃, the steel presented high tempering resistance.
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