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异种钛合金协同送丝等离子增材制造试验
徐俊强1, 彭勇1, 周琦1, 王克鸿1, 朱军2
1.南京理工大学, 南京 210094;2.南京工程学院 南京 211167
摘要:
采用双丝协同等离子增材系统实现了TC4-TA2异种钛合金的增材成形,期望制备的增材构件具有良好的沉积形貌及优异的力学性能. 采用了体视显微镜、扫描电镜、EDS、XRD、拉伸及硬度等测试方法分析其组织及性能. 结果表明,增材构件中存在两种微观组织形态,即分布在沉积层交界处的α相集束组织和分布在沉积层中心的α + β相片层组织. 构件在竖直和水平方向上的抗拉强度分别为998和1 037 MPa,断后伸长率为9.2%和5.7%,断裂呈现为脆性解理断裂. 试验结果证明,等离子增材制造技术能够实现异种钛合金协同增材成形.
关键词:  双丝协同  钛合金  增材制造  微观组织  抗拉强度
DOI:10.12073/j.hjxb.2019400236
分类号:TG456.2
基金项目:国家自然科学基金资助项目(51375243,51505226)
Study on plasma wire and arc additive manufacturing process of titanium alloys with twin-wire feeding
XU Junqiang1, PENG Yong1, ZHOU Qi1, WANG Kehong1, ZHU Jun2
1.Nanjing University of Science and Technology, Nanjing 210094, China;2.Nanjing Institute of Technology, Nanjing 211167, China
Abstract:
TC4-TA2 titanium alloy component was deposited by plasma wire arc additive manufacturing with twin-wire feeding and its good depositional morphology and excellent mechanical properties were expected. OM, SEM, EDS, XRD, tensile and hardness test were carried out to study the macro and microstructure of the component, as well as mechanical properties. The results showed that there were two kinds of microstructures in the component. They were the colonies of α phase which was distribute in the junction of the deposited layer and the lamellar of α + β phase which was distribute in the center of the deposited layer. The tensile strength of specimens in the vertical and horizontal directions were 998 MPa and 1 037 MPa, respectively. Meanwhile, their elongation at break were 9.2% and 5.7% and the fracture appeared as brittle cleavage fracture. The experimental results showed that the plasma arc additive manufacturing with twin-wire feeding can realize the preparation of dissimilar titanium alloy components.
Key words:  twin-wire feeding  titanium alloy  additive manufacturing  microstructures  tensile strength