4.7 Article

Unraveling the inherent anisotropic properties of in situ alloyed copper-modified titanium alloys produced by laser powder bed fusion

期刊

JOURNAL OF ALLOYS AND COMPOUNDS
卷 966, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2023.171323

关键词

Laser powder bed fusion; Titanium alloys; Anisotropy; Wear behavior; Tensile properties

向作者/读者索取更多资源

Good mechanical properties were achieved in laser powder bed fusion-produced titanium by promoting the columnar to equiaxed transition through alloying with copper. Thermal cycling along the build direction led to the segregation of copper and conversion of compressive to tensile residual stress. The friction coefficient, hardness, and wear resistance were similar in different sections of the build, and the wear mechanism was a combination of abrasive and delamination wear.
Preventing anisotropy in materials produced by laser powder bed fusion (LPBF) has become a major challenge. In this work, we achieved good mechanical properties in LPBF-produced titanium by promoting the columnar to equiaxed transition (CET) though alloying with copper to produce a Ti-5 wt% Cu alloy. Horizontal specimens at different build heights all consisted of mainly equiaxed prior-& beta; grains (- 13 & mu;m) with ultrafine & alpha; lamellae (0.19 & mu;m width) that exhibited weak textures. Thermal cycling along the build direction (BD) not only promoted the segregation of Cu from top to bottom, but also converted the compressive residual stress (-109.0 & PLUSMN; 22.2 MPa) to tensile residual stress (10.4 & PLUSMN; 9.7 MPa). The friction coefficient, hardness, and wear resistance found in different sections of the build were all very similar. The wear mechanism of the specimens was a combination of abrasive and delamination wear. The yield strength, ultimate strength, and elongation of specimens from the top section of the build were 993 & PLUSMN; 18 MPa, 1145 & PLUSMN; 60 MPa, and 8.6 & PLUSMN; 0.2%, respectively. While the strength of the middle and bottom specimens remains at the same level as that of the top specimen, a reduction in elongation was observed due to the segregation of Cu. Additionally, the strength of vertical specimens was about 50-70 MPa higher than that of horizontal specimens, which is thought to be caused by residual stress gradient along the BD.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据