摘要
研究了不同热处理工艺下Cr5Mo1V冷作模具钢的显微组织和力学性能。结果表明:Cr5Mo1V冷作模具钢经860℃×2 h+740℃×5 h退火后,组织为粒状珠光体+块状、粒状碳化物,碳化物主要是富含Cr、Mo、V等元素的M7C3碳化物,退火后硬度为23 HRC,再经520℃×2 h回火处理后组织为回火马氏体、碳化物和残余奥氏体,回火后出现二次硬化现象,硬度达到最大值62 HRC,抗拉强度达到1035 MPa,但伸长率仅为2.3%,塑性较差,这与材料成分、组织不均匀性有关,需要通过改善成分偏析及组织的均匀性,并结合合理的热处理工艺进一步改善材料性能。
The microstructure and mechanical properties of Cr5Mo1V cold working die steel were studied under different heat treatment processes.Results show that after annealing at 860℃×2 h+740℃×5 h the microstructure of Cr5Mo1V cold working die steel is spheroidal pearlite+massive,and granular carbide,carbide is mainly M7C3 carbide with elements of Cr,Mo,V,hardness is 23 HRC after annealing,after 520℃×2 h tempering treatment microstructure is tempering martensite,carbides and residual austenite.Secondary hardening appears after tempering,maximum hardness is 62 HRC,tensile strength is 1035 MPa,but the elongation is only 2.3%,plasticity is low,it relates to the material composition,nonuniform microstructure.By improving composition segregation and microstructure uniformity,and combining with reasonable heat treatment process,the material performance can be improved.
作者
蔡英
陈华
CAI Ying;CHEN Hua(School of Electrical and Mechanical Engineering,Liuzhou Vocational Technical College,Liuzhou 545006,China)
出处
《热加工工艺》
北大核心
2019年第2期214-216,219,共4页
Hot Working Technology
基金
广西高等学校科研项目(KY2015LX638)
关键词
模具钢
热处理工艺
力学性能
mold steel
heat treatment process
mechanical performance
