取向对3D打印成形Ti600合金组织和力学性能的影响  

Effect of Orientation on Microstructure and Mechanical Properties of 3D-Printed Ti600 Alloy

作　　者：杨晓英 陈明航 李峰 刘源 Yang Xiaoying;Chen Minghang;Li Feng;Liu Yuan(School of Mechanical and Automotive Engineering,Nanyang Vocational College,Nanyang 474500,Henan,China;School of Mechanical and Electrical Engineering,Zhengzhou University of Science and Technology,Zhengzhou 450064,Henan,China;Xiria Lelijia Hydraulic Technology Co.,Ltd.,Nanyang 474500,Henan,China)

机构地区：[1]南阳职业学院机械与汽车工程学院,河南南阳474500 [2]郑州科技大学机电工程学院,河南郑州450064 [3]西峡乐力嘉液压科技有限公司,河南南阳474500

出　　处：《应用激光》2023年第6期73-77,共5页Applied Laser

基　　金：河南省高校人文社会科学研究一般项目(2022-ZZJH-151)。

摘　　要：采用3D打印成形方法制得内燃机用沉积态Ti600钛合金,利用相关仪器表征各取向(与激光扫描方向成45°、扫描方向和沉积方向)上的钛合金微观组织,并通过MTS万能拉伸机测试了其在各取向上的室温静态压缩特性。研究结果标明:在沉积方向上形成了很高的温度梯度,导致β相出现外延生长,生成了等轴晶组织,β相柱状晶尺寸接近400μm;各取向的试样中都形成了密排六方类型的晶体组织;45°角取向试样发生了(101)择优取向。各取向的试样断口处形成了许多韧窝和撕裂棱,表现为韧性断裂现象;按照韧窝尺寸大小排序依次为沉积方向、扫描方向、45°;45°取向试样达到了更高强度,其屈服强度接近890 MPa,同时断裂强度为980 MPa,沉积方向与扫描方向试样的强度基本相同;45°取向试样(101)取向生长减弱了材料变形阶段晶粒协调能力,抑制了变形过程的发生,达到了最高的强度,并且塑性发生降低。The deposited Ti600 titanium alloy for internal combustion engine was prepared by laser rapid prototyping.The microstructure of titanium alloy in several orientations(laser scanning direction 45°,scanning direction,and deposition direction)was characterized by relevant instruments,and its static compression characteristics at room temperature were tested by MTS universal tensile machine.The results show theβphase grows epitaxially with high temperature gradient in the deposition direction,and isometric structure is produced with size approaching 400μm.The crystal structure of dense hexagonal type is formed in all samples.At the 45°angle direction,samples present(101)preferred orientation.Many dimples and tearing edges are formed at the fracture of each orientation specimen,which show ductile fracture.According to the dimple size,the largest one is at deposition direction,follows by scanning direction and 45°.The 45°oriented samples show a higher strength with yield strength close to 890 MPa,and fracture strength being 980 MPa.The strength of samples at deposition direction and the scanning direction are basically the same.The samples(101)at 45°orientation reduce the grain coordination ability during the deformation stage and inhibit the deformation process so as to produce the highest grain strength and low plasticity.

关 键 词：3D打印成形 钛合金 微观组织 静态压缩 力学性能 

分 类 号：TG113.1[金属学及工艺—物理冶金]