激光选区熔化成形Ti-6Al-4V-0.5B合金的混晶组织与压缩性能研究

doi:10.11896/cldb.25010025

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Abstract For coarse columnar prior-β-Ti grains in Ti-6Al-4V (TC4) alloy formed by selective laser melting (SLM), this study developed a SLM-formed TC4-0.5B alloy with a mixed grain structure. The influence of laser power and scanning rate on the microstructure and compression properties of TC4-0.5B alloy was studied. The results showed that the mixed grain structure of TC4-0.5B alloy exhibited equiaxed prior-β-Ti grains with a size of about 5 μm at the edge of the melt pool, and columnar prior-β-Ti grains with a width of about 2 μm at the center of the melt pool. In addition, the in-situ reaction of Ti+B in the melt pool generates needle-like or network-like TiB distributed at the grain boundaries of prior-β-Ti grains. The increase in laser power has little effect on the morphology and microstructure of the melt pool, resulting in no significant changes in the compressive strength, yield strength and fracture strain of the alloy, which remain at 1 729—1 767 MPa, 1 331—1 347 MPa, and 10%—12%, respectively. As the scanning rate increases, the size of the melt pool decreases and the proportion of equiaxed grains increases, resulting in an increase in the compressive strength of the alloy from 1 760 MPa to 1 837 MPa and yield strength from 1 331 MPa to 1 472 MPa, respectively, while the fracture strain decreases from 11% to 8%.

Key words： selective laser melting Ti-6Al-4V-0.5B alloy prior-β-Ti grains compression property

Published: 25 January 2026 Online: 2026-01-27

CLC number:

TG146.2+3

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	Articles by authors
	WANG Liqing
	LI Yunlong
	MA Kai
	ZHANG Zhen
	ZHAO Zhanyong
	BAI Peikang

Cite this article:

WANG Liqing,LI Yunlong,MA Kai, et al. Microstructure and Compression Properties of Ti-6Al-4V-0.5B Alloy Prepared by Selective Laser Melting[J]. Materials Reports, 2026, 40(2): 25010025-6.

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https://www.mater-rep.com/EN/10.11896/cldb.25010025 OR https://www.mater-rep.com/EN/Y2026/V40/I2/25010025

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