热处理对冷作模具钢的组织与性能影响  

Effects of Heat-treatment on Microstructure and Properties of Cold Working Die Steel

作　　者：李海东[1] 戚正风[1] 

机构地区：[1]连云港职业技术学院

出　　处：《特种铸造及有色合金》2015年第4期348-351,共4页Special Casting & Nonferrous Alloys

摘　　要：以42CrMo模具钢为研究对象,采用拉伸试验、冲击试验、硬度测试和显微组织分析等方法,研究了淬火温度和回火温度对模具钢组织与力学性能的影响。结果表明,200℃低温回火时,随着淬火温度升高,模具钢的抗拉强度先上升后降低,而伸长率、断面收缩率、冲击韧度呈现下降趋势;600℃高温回火时,随着淬火温度的升高,模具钢的抗拉强度在1 040℃前略有降低,而伸长率、断面收缩率、冲击韧度和硬度整体呈现下降的趋势。200℃低温回火后的模具钢的强度满足要求,但是伸长率和冲击韧度均低于标准要求;600℃高温回火后,模具钢的强度、塑性和韧性都能满足冷作模具钢对基材的要求。Effects of quenching temperature and tempering temperature on 42 CrMo cold working die steel were investigated by tensile testing,impacting testing,hardness measurement and microstructure observation.The results show that,with tempering at 200 ℃,with the increase of quenching temperature,the tensile strength is increased firstly and then decreased,while,elongation,section shrinkage and impact power are decreased.With tempering at 600 ℃,with the increase of quenching temperature,the tensile strength of die steel is reduced lightly ahead of 1 040℃,while the elongation,section shrinkage,impact and hardness are decreased.After 200 ℃tempering,the strength of the steel mold meet the requirements,however,the elongation and impact power energy are lower than the standard requirements.After tempering at 600 ℃,the strength,plasticity and toughness meet the requirements of cold work die steel substrate.

关 键 词：模具钢 淬火 低温回火 高温回火 

分 类 号：TG161[金属学及工艺—热处理] TG142.1[金属学及工艺—金属学]