摘要
由于选区熔化成形的TC4钛合金致密程度不高,因此针对电子束选区熔化技术(SEBM)成形的TC4钛合金,随炉进行热等静压试验,研究分析热等静压处理后合金的微观组织和力学性能。结果表明,经过热等静压处理后的TC4钛合金试件通过排水法测试出的相对密度达到了99%以上,几乎完全致密。对拉伸试样并进行室温拉伸试验,热等静压处理后的试件呈现出抗拉强度下降,塑性提高的趋势,抗拉强度为640.49 MPa,低于SEBM成形件的760 MPa,断裂伸长率达到19.95%。试样断口呈现被拉长的杯锥状及数量少、形状大且深的韧窝。热等静压过处理后的试件呈现出网篮组织,整体均匀细致,在β晶界内密集的片状α相互交错分布,且伴随着等轴α相。
Hot Isostatic Pressing(HIP)is one of the effective methods to eliminate the internal clearance of the molded parts.In this paper,TC4 titanium alloy specimens prepared by Selective Electron Beam Melting(SEBM)are taken as the research object.Hot isostatic pressing experiments are carried out in the furnace to study and analyze the microstructure and mechanical properties of the alloy after hot isostatic pressing treatment.The experimental results show that the density of TC4 titanium alloy specimen after hot isostatic pressing reaches more than 99%by drainage method,and it is almost completely dense.The tensile test was carried out on the tensile specimen at room temperature.After hot isostatic pressing treatment,the tensile strength of the specimen decreased and the plasticity increased.The tensile strength was 640.49 MPa,which was lower than 760 MPa of SEBM formed parts,and the elongation at break reached 19.95%.The fracture surface of the specimen shows elongated cup and cone shape and a few large and deep dimples,which indicates that the plasticity of the specimen is improved and the strength is reduced.After hot isostatic pressing,the specimen presents a basket structure,which is uniform and fine as a whole,and consists of coarsened stripsαPhase and larger equiaxedαGrain composition with a small amountβGrain size.
作者
陈冬雪
徐博翰
张建飞
黄星光
孙宝福
CHEN Dongxue;XU Bohan;ZHANG Jianfei;HUANG Xingguang;SUN Baofu(College of Mechanical and Control Engineering,Guilin University of Technology,Guilin 541004,China;Foshan Taoyuan Advanced Institute of Manufacturing,Foshan 528225,China;Guilin Shida Technology Co.,Ltd.,Guilin 541004,China)
出处
《电焊机》
2023年第6期36-41,共6页
Electric Welding Machine
基金
广西创新驱动发展专项资金项目(桂科AA18242046)。
作者简介
陈冬雪(1999-),女,学士,主要从事金属增材制造的研究;通讯作者:徐博翰(1985-),男,硕士,工程师,主要从事金属增材制造和材料表面工程的研究。E-mail:1339745363@qq.com。
