摘要
采用激光选区熔化(SLM)技术分别成形注塑模具钢AISI420和S136,对两种模具钢的相组成、微观组织、显微硬度、抗拉强度和摩擦磨损性能等进行了研究。结果表明,SLM成形的AISI420具有更高的合金元素固溶度,合金固溶强化使得AISI420比S136具有更高的强度和伸长率,其强度和伸长率分别为1 234.13MPa、14.63%和642.89MPa、9.76%;由于S136中的C含量较高,在激光的快速冷却作用下,S136比AISI420更易产生马氏体组织,因此拥有更高的硬度和较低的磨损率,二者硬度(HV_3)和磨损率分别为589、3.28×10^(-6) mm^3·N^(-1)·m^(-1),493.78、4.12×10^(-6) mm^3·N^(-1)·m^(-1)。
Injection tool steels AISI 420 and S136 samples were fabricated by selective laser melting(SLM)technique.The phase composition,microstructure,microhardness,tensile strength and wear resistance of two tool steels were investigated systematically.The results show that SLM-processed AISI 420 samples have a higher solid solubility of the alloying elements.Due to the solid solution strengthening of the alloying elements,the AISI420 samples present the higher tensile strength and elongation than that of S136 samples.Tensile strength and elongation of the SLM-processed AISI 420 and S136 reach 1 234.13 MPa,14.63%and 642.89 MPa,9.76%,respectively.Due to the higher C content in S136,the martensitic transformation is more easily generated in the S136 samples under the laser-induced large solidification rate as compared to AISI 420 samples.The higher hardness and lower wear rate ware obtained for the SLM-processed S136 samples.Microhardness and wear rate of the SLM-processed S136 and AISI 420 samples reach 589 HV3,3.28×10-6 mm3·N-1·m-1 and 493.78 HV3,4.12×10-6 mm3·N-1·m-1,respectively.
作者
朱学超
文世峰
魏青松
Zhu Xuechao;Wen Shifeng;Wei Qingsong(Department of Mechanic and Electronic Engineering,Suzhou Vocational University;State Key Laboratory of Material Processing and Die&Mould Technology,Huazhong University of Science and Technology)
出处
《特种铸造及有色合金》
CAS
北大核心
2019年第5期506-510,共5页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金资助项目(51605176
51375189)
国家高技术研究发展计划(863计划)资助项目(2015AA042501)
湖北省科技支撑计划资助项目(2014BAA017)
