Reduction of residual stress in porous Ti6Al4V by <i>in situ</i> double scanning during laser additive manufacturing

Yi-wa Luo; Ming-yong Wang; Ji-guo Tu; Yu Jiang; Shu-qiang Jiao

doi:10.1007/s12613-020-2212-z

Volume 28 Issue 11

Nov. 2021

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2021 > 28(11): 1844-1853

Yi-wa Luo, Ming-yong Wang, Ji-guo Tu, Yu Jiang, and Shu-qiang Jiao, Reduction of residual stress in porous Ti6Al4V by in situ double scanning during laser additive manufacturing, Int. J. Miner. Metall. Mater., 28(2021), No. 11, pp. 1844-1853. https://doi.org/10.1007/s12613-020-2212-z

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Yi-wa Luo, Ming-yong Wang, Ji-guo Tu, Yu Jiang, and Shu-qiang Jiao, Reduction of residual stress in porous Ti6Al4V by in situ double scanning during laser additive manufacturing, Int. J. Miner. Metall. Mater., 28(2021), No. 11, pp. 1844-1853. https://doi.org/10.1007/s12613-020-2212-z

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Research Article

Reduction of residual stress in porous Ti6Al4V by in situ double scanning during laser additive manufacturing

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Corresponding author:
Shu-qiang Jiao E-mail: sjiao@ustb.edu.cn
Received: 28 May 2020; Revised: 15 October 2020; Accepted: 19 October 2020; Available online: 20 October 2020

Abstract

Abstract

Selective laser melting (SLM) technology plays an important role in the preparation of porous titanium (Ti) implants with complex structures and precise sizes. Unfortunately, the processing characteristics of this technology, which include rapid melting and solidification, lead to products with high residual stress. Herein, an in situ method was developed to restrain the residual stress and improve the mechanical strength of porous Ti alloys during laser additive manufacturing. In brief, porous Ti6Al4V was prepared by an SLM three-dimensional (3D) printer equipped with a double laser system that could rescan each layer immediately after solidification of the molten powder, thus reducing the temperature gradient and avoiding rapid melting and cooling. Results indicated that double scanning can provide stronger bonding conditions for the honeycomb structure and improve the yield strength and elastic modulus of the alloy. Rescanning with an energy density of 75% resulted in 33.5%–38.0% reductions in residual stress. The porosities of double-scanned specimens were 2%–4% lower than those of single-scanned specimens, and the differences noted increased with increasing sheet thickness. The rescanning laser power should be reduced during the preparation of porous Ti with thick cell walls to ensure dimensional accuracy.
- porous titanium;
- selective laser melting;
- additive manufacturing;
- residual stress;
- mechanical properties

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