摘要
采用选择性激光熔覆法,在基板温度分别为100,150,和200℃条件下制备M2粉末高速钢合金,分析基板温度对合金组织结构与力学性能的影响。结果表明,基板温度升高有利于提高M2粉末高速钢的致密度和整体组织的均匀性。当基板温度为200℃时,高速钢组织均匀致密,各元素固溶程度高,且碳化物含量高,组织中柱状晶不再沿Z轴方向单一生长,同时合金的显微硬度(HV0.1)达到最高,HV0.1为1 150,相比基板温度为100℃时的合金提高近40%。随基板温度从100℃升高到200℃,沿Z轴打印的M2高速钢室温抗拉强度从865.23 MPa降低到443.85 MPa,主要原因是合金中单一方向的柱状晶数量减少。
M2 high-speed steels were prepared by selective laser melting(SLM)with the substrate temperature of 100,150 and 200℃respectively.The effects of substrate temperature on the microstructure and mechanical properties of the samples were studied.The results show that increasing of substrate temperature is beneficial to increase the density and uniformity of M2 high-speed steel.When the substrate temperature is 200℃,the microstructure of the SLM sample is more uniform and dense,the solid solution of each element and the content of carbide is high.The direction of the columnar crystals no longer grows only along the Z-axis direction.At the same time,the sample with 200℃substrate temperature has the maximum microhardness of 1 150 HV0.1,which is increased by 40%compared with the samples with 100℃substrate temperature.With increasing substrate temperature from 100℃to 200℃,the tensile strength of M2 high-speed steel at room temperature printed along the Z-axis decreases from 865.23 MPa to 443.85 MPa,due to the decrease of the number of columnar grains in a single direction.
作者
丁焕
刘如铁
熊翔
徐杰
陈洁
廖宁
DING Huan;LIU Rutie;XIONG Xiang;XU Jie;CHEN Jie;LIAO Ning(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)
出处
《粉末冶金材料科学与工程》
EI
北大核心
2018年第5期511-517,共7页
Materials Science and Engineering of Powder Metallurgy
基金
国家重点研发计划资助项目(2016YFB0700302)
关键词
选择性激光熔覆
高速钢
基板温度
致密度
显微硬度
抗拉强度
selective laser melting(SLM)
high-speed steel
substrate temperature
density
microhardness
tensile strength
