SLM成形高导热注塑模具钢及热处理后的组织与性能  

Microstructure and properties of SLM formed high thermal conductivity injection mould steel and after heat treatment

作　　者：陈亚辉 杨海波[2,3,4] 张苗 Chen Yahui;Yang Haibo;Zhang Miao(Wuhan Second Ship Design and Research Institute,Wuhan Hubei 430000,China;School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China;Dongguan Institute of Materials and Genes Advanced Institute of Technology,Dongguan Guangdong 523808,China;Key Laboratory of the Interaction of Fluids and Materials,Ministry of Education,Beijing 100083,China)

机构地区：[1]武汉第二船舶设计研究所,湖北武汉430000 [2]北京科技大学机械工程学院,北京100083 [3]东莞材料基因高等理工研究院,广东东莞523808 [4]流体与材料相互作用教育部重点实验室,北京100083

出　　处：《金属热处理》2024年第10期162-168,共7页Heat Treatment of Metals

基　　金：广东省重点领域研发计划(2020B010184001);广东省创新创业团队引进计划(2016ZT06G025);广东省自然科学基金(2017B030306014)

摘　　要：以新型高导热注塑模具钢材料1CrMoVNb为研究对象,利用光学显微镜、X射线衍射仪(XRD)和扫描电镜(SEM)等对其SLM成形及热处理后的组织与性能进行分析。结果表明:1CrMoVNb钢SLM成形试样的熔化轨迹搭接良好,横截面主要为胞状晶,纵截面主要为柱状晶,组织主要为铁素体,经过淬火(1250℃×60min,水冷)和回火(600℃×120min,空冷)后,搭接线消溶,组织更加均匀,大部分转变为回火马氏体。SLM成形试样的力学性能存在各向异性,横截面硬度大于纵截面,横向抗拉强度和屈服强度优于纵向,而横向延伸率则低于纵向。经过热处理后,试样的力学性能与热导率大幅提高,各向异性改善,可以很好地满足注塑模具钢的使用要求。Microstructure and properties of SLM formed specimen and after heat treatment of a new high thermal conductivity injection mould steel 1CrMoVNb were analyzed by means of optical microscope,X-ray diffractometer(XRD),scanning electron microscope(SEM).The results show that the SLM formed specimen is well lapped,with mainly cellular crystals in the cross-section and columnar crystals in the longitudinal section,and the microstructure is mainly ferrite.After quenching at 1250℃for 60 min,WQ and tempering at 600℃for 120 min,AC,the lap line dissolves,the microstructure is more uniform and mostly transforms to tempered martensite.The mechanical properties of the SLM formed specimen are anisotropic,the hardness in transverse section is greater than that in longitudinal section,the transverse tensile strength and yield strength is better than the longitudinal,while the transverse elongation is lower than the longitudinal.After heat treatment,the mechanical properties and thermal conductivity of the specimen are greatly improved,and the anisotropy is improved,which can well meet the requirements of injection mold steel.

关 键 词：SLM 高导热 注塑模具钢 微观组织 性能 

分 类 号：TF124[冶金工程—粉末冶金]