Understanding process-microstructure-property relationships in laser powder bed fusion of non-spherical Ti-6Al-4V powder

被引:21
作者
Asherloo, Mohammadreza [1 ]
Hwang, Junghyun [1 ,7 ]
Leroux, Ryan [2 ]
Wu, Ziheng [3 ,6 ]
Fezzaa, Kamel [4 ]
Paliwal, Muktesh [5 ]
Rollett, Anthony D. [3 ]
Mostafaei, Amir [1 ]
机构
[1] IIT, Dept Mech Mat & Aerosp Engn, 10 W 32nd St, Chicago, IL 60616 USA
[2] Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA USA
[3] Carnegie Mellon Univ, Dept Mat Sci & Engn, Pittsburgh, PA 15213 USA
[4] Argonne Natl Lab, Xray Sci Div, Lemont, IL 60439 USA
[5] Kymera Int Reading Alloys, Robesonia, PA 19551 USA
[6] Lawrence Livermore Natl Lab, Mat Engn Div, 7000 East Ave, Livermore, CA 94550 USA
[7] LG Energy Solut, Seoul, South Korea
基金
美国国家科学基金会; 美国安德鲁·梅隆基金会;
关键词
Additive manufacturing; Texture analysis; Synchrotron X-ray high-speed imaging; Variant selection; Hardness; Hydride-dehydride powder; VARIANT SELECTION; ALPHA PRECIPITATION; MARTENSITE; PREDICTION; PARAMETERS; EVOLUTION; STRATEGY; POROSITY; STRESS;
D O I
10.1016/j.matchar.2023.112757
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Powder feedstock is a major cost driver in metal additive manufacturing (AM). Replacing the spherical powder with the cost-efficient non-spherical one can reduce the feedstock cost up to 50% and attract more interest to adopt AM in production and new alloy development. Here, a comprehensive study was conducted to understand process-microstructure-property relationships in laser powder bed fusion of hydride-dehydride Ti-6Al-4V powder. We demonstrated that variation of laser scan speed had a significant impact on the grain structure, pore evolution and properties compared to laser power. Dynamic X-ray radiography showed that with decreasing scan speed at a constant laser power, a transition from conduction to keyhole mode laser processing occurred, in which a deeper melt pool at lower scan speed intensified texture. In other words, an increase in laser scan speed resulted in formation of the refined prior beta grains with shape factor of similar to 5, lowering the anisotropy. The degree of variant selection was evaluated based on the analyzed texture as a function of laser power and scan speed. With increasing laser scan speed, the dominant alpha/alpha boundary type was altered from type 2 to 4 and the degree of variant selection was noticeably decreased. On the other hand, increasing laser power left the morphology of prior beta grains, their size, and the dominant alpha/alpha boundary (type 4) unchanged, while the texture and anisotropy were intensified, and the degree of variant selection was slightly decreased. Finally, dependency of surface roughness and microhardness were discussed as a function of laser processing parameters.
引用
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页数:14
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