Laser powder bed fusion (L-PBF) of Ti-6Al-4V/Ti-6Al-2Sn-4Zr-2Mo and Ti-6Al-4V/γ-TiAl bimetals: Processability, interface and mechanical properties

被引:17
作者
Fan, Haiyang [1 ,2 ]
Wang, Chengcheng [3 ]
Tian, Yujia [3 ]
Zhou, Kun [3 ]
Yang, Shoufeng [1 ]
机构
[1] Harbin Engn Univ, Yantai Res Inst, Yantai 264000, Peoples R China
[2] Katholieke Univ Leuven, Dept Mech Engn & Member Flanders Make, Celestijnenlaan 300B,Box 2420, B-3001 Leuven, Belgium
[3] Nanyang Technol Univ, Sch Mech & Aerosp Engn, 50 Nanyang Ave, Singapore 639798, Singapore
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2023年 / 871卷
关键词
Multi-material additive manufacturing; Laser powder bed fusion; Titanium alloy; Bimetallic bonding; Mechanical properties; MICROSTRUCTURE; ALLOY; TI-6AL-4V; PHASE; MARTENSITE; STRENGTH; ALUMINUM; BEHAVIOR; MG;
D O I
10.1016/j.msea.2023.144907
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Titanium alloys of near-alpha Ti-6Al-2Sn-4Zr-2Mo (Ti-6242) and intermetallic gamma-TiAl (Ti-48Al-2Cr-2Nb) are commonly served as turbine blade materials operating at elevated temperatures. This study investigated the feasibility of using laser powder bed fusion (L-PBF) to fabricate two Ti-6Al-4V-based bimetals, i.e., Ti-6Al-4V/ gamma-TiAl and Ti-6Al-4V/Ti-6242, which may have great potential for the future manufacturing of aerospace components. Results indicated that the bimetal of Ti-6Al-4V/gamma-TiAl was unsuccessfully built despite a gradient interface (similar to 250 mu m) achieved via L-PBF. This failure was attributed to the intrinsic cold cracking of gamma-TiAl processed by L-PBF instead of the weak interfacial bonding between the two materials. In comparison, another pair of bimetal, Ti-6Al-4V/Ti-6242, was manufactured successfully by L-PBF, resulting in a solid and defect-free interface. Horizontal tensile tests were conducted, and the ultimate strength of the bimetal Ti-6Al-4V/Ti-6242 was 1314 +/- 21 MPa. However, compared to single materials, the elongation of the bimetal was lowered to 2.8 +/- 0.9% because of the mechanical incompatibility between Ti-6Al-4V and Ti-6242.
引用
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页数:11
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