激光扫描速度对选区激光熔化TC4钛合金组织和性能的影响  

Effect of Laser Scanning Speed on Microstructure and Properties of TC4 Titanium Alloy Formed by SLM

作　　者：李伟[1] 金头男[1] 方晓英[2] 马铁军 郑俊楠 LI Wei;JIN Tounan;FANG Xiaoying;MA Tiejun;ZHENG Junnan(Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China;School of Mechanical Engineering,Shandong University of Technology,Zibo 255000,China)

机构地区：[1]北京工业大学材料与制造学部,北京100124 [2]山东理工大学机械工程学院,山东淄博255000

出　　处：《热加工工艺》2023年第1期28-32,37,共6页Hot Working Technology

摘　　要：通过选区激光熔化技术(SLM)制备了TC4钛合金,利用X射线显微镜(XRM)、X射线衍射仪(XRD)、扫描电子显微镜(SEM)、电子背散射衍射仪(EBSD)和拉伸试验机等分析了激光扫描速度对试样内部孔洞、显微组织和力学性能的影响。结果表明,SLM成型TC4钛合金的孔洞分布均匀,孔洞形貌不规则,以小于80μm的小尺寸孔洞为主,随着扫描速度增加,孔隙率和孔洞平均尺寸增加;材料微观组织主要由针状α’马氏体组成,含有少量的β相,随着激光扫描速度的增加,一次马氏体相平均宽度降低,材料的抗拉强度、屈服强度降低。TC4 titanium alloy was prepared by selecting laser melting technology(SLM), the effect of laser scanning speed on the internal hole, microstructure and mechanical properties was studied by X-ray microscope(XRM) technology,X-ray diffractometer(XRD), scanning electron microscope(SEM) and electron backscatter diffraction(EBSD). The results show that the holes in TC4 titanium alloy formed by SLM are evenly distributed, and the hole morphology is irregular, and it is mainly small-sized less than 80 μm. With the scanning speed increasing, the porosity and the average size of holes increase.The microstructure is mainly composed of acicular α’ martensite and a small amount of β phase. With the scanning speed increasing, the average width of primary martensite phase decreases, and the tensile strength and yield strength decrease.

关 键 词：选区激光熔化 钛合金 激光扫描速度 孔洞 微观组织 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG456.7[金属学及工艺—金属材料]