H13钢回火组织及碳化物转变规律  

Transformation rule of microstructure and carbides of H13 steel during tempering

作　　者：张程[1] 黄进峰[1] 窦梦阳 连勇[2] 王俊峰[1] 张尊君 周启明[1] 张济山[1] 

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083 [2]北京科技大学新材料技术研究院,北京100083

出　　处：《金属热处理》2016年第5期1-5,共5页Heat Treatment of Metals

基　　金：国家重点基础研究发展计划(973计划)(2011CB606303)

摘　　要：通过微观组织和第二相分析,以及力学性能测试,研究了400~700℃范围内回火温度对H13钢组织及碳化物转变的影响。结果表明：400~550℃回火,基体组织为回火马氏体,碳化物主要为Mo2C和VC;硬度在550℃回火达到峰值,出现二次硬化效应。600~650℃回火时,组织为回火屈氏体,主要碳化物为Fe3M3C和Cr7C3,同时,马氏体大量分解,碳化物粗化,硬度急剧下降,韧性快速升高;700℃回火时,基体为回火索氏体,碳化物明显聚集长大,表现出过时效。Effect of tempering temperature between 400 ℃ and 700 ℃ on microstructure and carbide transformation of H13 steel was studied by means of mechanical property test and mierostrueture and second phase analysis. The results indicate that when tempered at 400-450 ℃ , mierostructure of the quenched H13 steel is characterized by tempered martensite, and the carbides mainly consist of VC and Fe3 M3 C. The hardness peak of the steel can be observed when tempered at 550 ℃, because of secondary hardening effect caused by a large number of Mo2 C precipitate. When tempered at 600-650 ℃ , the martensite decomposes substantially, the size of carbides grow gradually, the hardness decreases sharply and the toughness grows quickly. The microstrueture becomes tempered troostite, and the primary carbides are Fe3M3C, CrTC3 and VC while tempered at 650 ℃. When tempered at 700 ℃ , the H13 steel shows overaging phenomenon as the matrix becomes tempered sorbite, and the dimension of carbides increase significantly.

关 键 词：热作模具钢 回火 硬度 碳化物 

分 类 号：TG162.41[金属学及工艺—热处理]