TiC添加量对选区激光熔化CX不锈钢组织和性能的影响  

Effect of TiC addition on microstructure and properties of CX stainless steel prepared by selective laser melting

作　　者：王善琛 朱伟茜 李晓峰[1] 王建宏[1] WANG Shanchen;ZHU Weiqian;LI Xiaofeng;WANG Jianhong(School of Materials Science and Engineering,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学材料科学与工程学院,太原030051

出　　处：《粉末冶金技术》2025年第2期144-152,共9页Powder Metallurgy Technology

基　　金：山西省重点研发计划项目(202102050201009);山西省回国留学人员科研资助项目(2024-116)。

摘　　要：利用X射线衍射分析、扫描电子显微观察、电子背向散射衍射分析等手段,研究了TiC添加量(0、2%、4%、6%,质量分数)对选区激光熔化技术制备CX不锈钢微观组织和力学性能的影响。结果表明:TiC的加入对CX不锈钢的晶粒尺寸有明显影响,进而影响其力学性能。随着TiC含量的增加,CX不锈钢的平均晶粒尺寸由2.08μm分别减小到0.94、0.66、0.71μm,最多减小了68.3%;CX不锈钢的硬度逐渐增强,最高可达HV_(0.5) 491,相比原始打印态CX不锈钢提高了63.1%。随着TiC含量的增加,抗拉强度先升高后降低,当TiC质量分数为4%时,达到最大值(1574 MPa),相比原始打印态CX不锈钢提高了58.2%;断裂延伸率先升高后降低,当TiC质量分数为2%时,达到最大值(16.8%),相比原始打印态CX不锈钢提高了29%。当TiC质量分数为4%时,CX不锈钢具有较优的综合力学性能,其中屈服强度为1081 MPa,抗拉强度为1574 MPa,硬度为HV_(0.5) 360,和原始打印态CX不锈钢相比,分别提高了21.1%、58.2%和21.5%。The effect of TiC addition(0,2%,4%,and 6%,mass fraction)on the microstructure and mechanical properties of the CX stainless steels fabricated by selective laser melting(SLM)was investigated by X-ray diffraction(XRD)analysis,scanning electron microscopy(SEM),and electron back-scattered diffraction(EBSD)in this paper.The results indicate that the addition of TiC significantly influences the grain size of CX stainless steels,thereby affecting the mechanical properties.As the TiC content increases,the average grain size of CX stainless steels decreases from 2.08μm to 0.94μm,0.66μm,and 0.71μm,respectively,with the maximum reduction of 68.3%.The hardness of CX stainless steels gradually increases with the higher TiC content,reaching the maximum of HV0.5491,which represents the 63.1%improvement compared to the original printed CX stainless steels.The tensile strength initially increases and then decreases with the increase of TiC content,peaking at 1574 MPa when the TiC content is 4%,which represents the 58.2%improvement compared to the original printed CX stainless steels.The fracture elongation first increases and then decreases with the higher TiC content,reaching the maximum of 16.8%at 2%TiC,showing the 29%improvement compared to the original printed CX stainless steels.When the TiC content is 4%,the CX stainless steels exhibit the optimal comprehensive mechanical properties as the yield strength of 1081 MPa,tensile strength of 1574 MPa,and hardness of HV_(0.5)360,representing the improvements of 21.1%,58.2%,and 21.5%,respectively,compared to the original printed CX stainless steels.

关 键 词：选区激光熔化 碳化钛 CX不锈钢 微观组织 力学性能 

分 类 号：TF125[冶金工程—粉末冶金] TG142.1[冶金工程—冶金物理化学]