Effect of laser scanning speed on the microstructure, phase transformation and mechanical property of NiTi alloys fabricated by $\mathrm{LPBF}$

Guo, Wenqian; Feng, Bo; Yang, Ying; Ren, Yang; Liu, Yinong; Yang, Hong; Yang, Qin; Cui, Lishan; Tong, Xin; Hao, Shijie

doi:10.1016/j.matdes.2022.110460

Title: Effect of laser scanning speed on the microstructure, phase transformation and mechanical property of NiTi alloys fabricated by $$\mathrm{LPBF}$$

Journal Article · 14 February 2022 · Materials & Design

DOI: https://doi.org/10.1016/j.matdes.2022.110460 · OSTI ID:1981700

Guo, Wenqian ^[1]; Feng, Bo ^[1]; Yang, Ying ^[1];

^[2];

^[3]; Yang, Hong ^[3]; Yang, Qin ^[4]; Cui, Lishan ^[1]; Tong, Xin ^[5]; Hao, Shijie ^[1]

China University of Petroleum, Beijing (China)
City University of Hong Kong, Kowloon (Hong Kong)
University of Western Australia, Perth, WA (Australia)
China Academy of Engineering Physics, Mianyang (China)
Jinan University, Guangzhou, Guangdong (China)

This study investigated the effects of laser scanning speed on the microstructure, phase transformation and properties of NiTi alloys fabricated by laser powder bed fusion (LPBF). In this study, the contributions of metallurgical factors under different scanning speeds, such as Ni evaporation, Ni4Ti3 precipitation, dislocations and internal stress, to the transformation temperature and transformation latent heat were clarified through specially designed experiments. Ni evaporation is found to have the most profound effect, followed by precipitation. Increasing scanning speed is found to reduce Ni loss, thus cause less increase in the transformation temperature and transformation heat of the LPBF-NiTi alloys. Increasing scanning speed also increases the microstructure non-uniformity and thus widens the transformation temperature interval. The orientations of residual stress exhibit strong crystallographic stiffness dependence. The LPBF-NiTi alloys with different scanning speeds all exhibited high strains (>13.4%) and excellent shape memory effect. A LPBF-NiTi honeycomb structure exhibited 96% shape recovery rate after a 60% pre-compressive deformation. Besides, there is an optimum scanning speed for minimum porosity and smallest average pore size. However, the pore structure is found to have weak influence on the tensile behaviour of the LPBF-NiTi alloys, possibly due to the high defect tolerance of the martensitic transformation.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: Advanced Structural Technology Foundation of China; Australia Research Council; Guang-dong Basic and Applied Basic Research Foundation; National Natural Science Foundation of China (NSFC); National Scholastic Athletics Foundation (NSAF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1981700

Journal Information:: Materials & Design, Journal Name: Materials & Design Journal Issue: C Vol. 215; ISSN 0264-1275

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
NiTi shape memory alloy
laser powder bed fusion
laser scanning speed
martensitic transformation
residual stress

Title: Effect of laser scanning speed on the microstructure, phase transformation and mechanical property of NiTi alloys fabricated by $$\mathrm{LPBF}$$

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