Effect of Hot Isostatic Pressing on Properties of TC4 Ttitanium Alloy Parts Prepared by Selective Electron Beam Melting

CHEN Dongxue; XU Bohan; ZHANG Jianfei; HUANG Xingguang; SUN Baofu

doi:10.7512/j.issn.1001-2303.2023.06.06

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Effect of Hot Isostatic Pressing on Properties of TC4 Ttitanium Alloy Parts Prepared by Selective Electron Beam Melting
Vol. 53, Issue 6, Pages: 36-41(2023)
Received：27 July 2022，

Revised：2023-05-25，

Published：25 June 2023
DOI： 10.7512/j.issn.1001-2303.2023.06.06
稿件说明：

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陈冬雪，徐博翰，张建飞，等.热等静压对SEBM成形TC4钛合金性能的影响分析［J］.电焊机，2023，53（6）：36-41. DOI： 10.7512/j.issn.1001-2303.2023.06.06.

CHEN Dongxue, XU Bohan, ZHANG Jianfei, et al.Effect of Hot Isostatic Pressing on Properties of TC4 Ttitanium Alloy Parts Prepared by Selective Electron Beam Melting[J].Electric Welding Machine, 2023, 53(6): 36-41. DOI： 10.7512/j.issn.1001-2303.2023.06.06.

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。

Abstract

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 strips α Phase and larger equiaxed α Grain composition with a small amount β Grain size.

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references

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