调质工艺对3Cr2Mo钢组织和性能的影响  

Effect of quenching-tempering process on microstructure and properties of 3Cr2Mo steel

作　　者：李红英[1] 曾翠婷[1] 王法云 赵延阔[1] 康巍[1] 邓云喆[1] 刘洋[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]广州市质量监督检测研究院,广东广州510115

出　　处：《材料热处理学报》2011年第3期120-126,共7页Transactions of Materials and Heat Treatment

摘　　要：通过洛氏硬度和冲击试验以及OM、SEM和TEM组织观察,研究了不同热处理工艺参数对塑料模具用3Cr2Mo钢显微组织和力学性能的影响,分析不同热处理工艺条件下3Cr2Mo钢塑性、硬度以及冲击韧性的变化规律。结果表明:3Cr2Mo钢经850～920℃×1 h油淬,获得细小板条状马氏体组织,合金元素充分溶解;经570～630℃空冷回火,碳化物细小弥散分布得到均匀稳定的回火索氏体组织,其硬度达到较佳的使用范围(28～36 HRC),且具有较好的强韧性配合,能够满足塑料模具钢使用要求。Influences of different heat treatment processes on microstructure and mechanical properties of plastics mould steel 3Cr2Mo were investigated by means of Rockwell hardness test,impact test,optical microscope,scanning electron microscope and transmission electron microscope observation.The changing rules of plasticity,hardness and impact toughness of 3Cr2Mo steel at different heat treatment processes were analyzed.The results show that fine lath martensite is obtained and alloy elements are fully dissolved under oil quenching at 850-920 ℃ for 1 h.When tempered at 570-630 ℃ for 2 h,the optimum hardness range of 28-36 HRC,dispersive tiny carbide and uniform and stable tempered sorbite are obtained,and excellent combination of strength and toughness is also obtained,which can satisfy basic application of plastic mould steel.

关 键 词：3Cr2Mo钢 预硬化处理 塑料模具钢 回火索氏体 

分 类 号：TG161[金属学及工艺—热处理]