冷却速度对电弧增材制造TC4组织性能的影响

冷却速度对电弧增材制造TC4组织性能的影响 Effect of cooling rate on microstructure and properties of TC4 by wire arc additive manufacturing 刘祥宇 LIU Xiangyu 1 first-author 柳晋 LIU Jin 2 徐国建 XU Guojian 2 高飞 GAO Fei 1 唱丽丽 CHANG Lili 3 沈阳中科煜宸科技有限公司  沈阳中科煜宸科技有限公司  Shenyang Zhongke Raycham Science and Technology Co.,Ltd. Shenyang Zhongke Raycham Science and Technology Co.,Ltd. 沈阳工业大学材料科学与工程学院 沈阳工业大学材料科学与工程学院 School of Material Science and Engineering,Shenyang University of Technology School of Material Science and Engineering,Shenyang University of Technology 南京中科煜宸激光技术有限公司 南京中科煜宸激光技术有限公司 Nanjing Zhongke Raycham Laser Technology Co.,Ltd. Nanjing Zhongke Raycham Laser Technology Co.,Ltd. 电弧增材制造(WAAM)技术兼具生产效率高和成本低的特点,但为保证其生产的零部件的综合性能,往往需要进行后续的热处理。文中采用WAAM技术制备了TC4试样,利用光学显微镜、扫描电镜、X射线衍射仪、拉伸试验机及硬度仪研究了冷却速度(950℃/2 h/WC水冷、950℃/2 h/AC空冷、950℃/2 h/FC炉冷)对TC4组织与性能的影响。试验结果表明,WC、AC及FC冷却方式下TC4试样的组织均由初生α相和β相组成,其中WC冷却方式得到的β相较多;TC4试样的组织由下至上均呈现逐渐粗化的倾向;随着冷却速度的降低,初生α相有粗化趋势,TC4试样抗拉强度降低,塑性提高;950℃/2 h/AC WAAM TC4试样力学性能超越了铸件国标要求;拉伸试样断口形貌均为塑性断裂。 Wire arc additive manufacturing（WAAM）technology has the characteristics of high production efficiency and low cost,but in order to ensure the comprehensive performance of the parts produced by WAAM,post heat treatment is often required. In this study,TC4 sample is fabricated by WAAM,and through the optical microscope,scanning electron microscope,X-ray diffraction,tensile testing machine and the hardness tester,the effect of cooling rates（water cooling（WC）,air cooling（AC） and furnace cooling（FC） at950 ℃ for 2 h） on microstructure and mechanical properties of TC4 is studied. The results show that the microstructures of the TC4 samples under WC,AC and FC modes are composed of primary α phase and β phase,and more β phase is obtained under the WC mode. The microstructure of the TC4 sample shows a tendency of coarsening gradually from the lower part to the upper part. As the cooling rate decreases,the primary αphase gradually coarsens,and the tensile strength of the TC4 sample reduces,and the plasticity increases. The mechanical properties of TC4 sample with 950 ℃ ×2 h/AC exceeds the requirements of the national standard of casting, and the appearance of fracture of tensile samples shows plastic fracture. 电弧增材制造 TC4 显微组织 力学性能 冷却速度 wire arc additive manufacturing TC4 microstructure mechanical properties cooling rate TG146.23 国家重点研发计划（2017YFB1104000） 2022-03-08 8 51