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

材料导报

2026, Vol. 40

Issue (2): 25010025-6 https://doi.org/10.11896/cldb.25010025

金属与金属基复合材料

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

王利卿^1,2,*, 李云龙¹, 马凯¹, 张震¹, 赵占勇¹, 白培康¹

1 中北大学材料科学与工程学院,太原 030051
2 中国船舶集团汾西重工有限责任公司,太原 030027

Microstructure and Compression Properties of Ti-6Al-4V-0.5B Alloy Prepared by Selective Laser Melting

WANG Liqing^1,2,*, LI Yunlong¹, MA Kai¹, ZHANG Zhen¹, ZHAO Zhanyong¹, BAI Peikang¹

1 School of Materials Science and Engineering, North University of China, Taiyuan 030051, China
2 China Shipbuilding Industry Corporation Fenxi Heavy Industry Co., Ltd., Taiyuan 030027, China

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摘要针对激光选区熔化(Selective laser melting,SLM)成形Ti-6Al-4V(TC4)合金中粗大的柱状初生β-Ti晶粒,本工作通过添加B元素开发出了具有混晶组织的SLM成形TC4-0.5B合金。研究了激光功率和扫描速率对TC4-0.5B合金微观组织与力学性能的影响规律。结果表明:SLM成形TC4-0.5B合金的混晶组织表现为熔池边部呈现尺寸约5 μm的等轴状初生β-Ti晶粒,熔池心部呈现宽度约2 μm的柱状初生β-Ti晶粒。此外,熔池内Ti+B原位反应生成针棒状或网络状TiB分布于初生β-Ti晶粒的晶界处。激光功率增加对熔池形貌和微观组织的影响较小,使得合金的抗压强度、屈服强度和断裂应变均未发生明显变化,分别维持在1 729～1 767 MPa、1 331～1 347MPa和10%～12%。随着扫描速率增加,熔池尺寸减小,等轴晶比例增加,使得合金的抗压强度由1 760 MPa增加到1 837 MPa,屈服强度由1 331 MPa增加到1 472 MPa,而断裂应变则由11%减小到8%。

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关键词: 激光选区熔化 Ti-6Al-4V-0.5B合金初生β-Ti晶粒压缩性能

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

出版日期: 2026-01-25 发布日期: 2026-01-27

ZTFLH:

TG146.2+3

基金资助: 国家自然科学基金青年项目(52305430);山西省基础研究计划资助项目(202203021212150);中北大学高层次人才科研启动费(11013110)

通讯作者: *王利卿,博士,中北大学材料科学与工程学院副教授。目前主要研究领域为增材制造金属材料的开发及微观组织与力学性能调控。wlq881120@163.com

引用本文:

王利卿, 李云龙, 马凯, 张震, 赵占勇, 白培康. 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[J]. 材料导报, 2026, 40(2): 25010025-6.
WANG Liqing, LI Yunlong, MA Kai, ZHANG Zhen, ZHAO Zhanyong, BAI Peikang. Microstructure and Compression Properties of Ti-6Al-4V-0.5B Alloy Prepared by Selective Laser Melting. Materials Reports, 2026, 40(2): 25010025-6.

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https://www.mater-rep.com/CN/10.11896/cldb.25010025 或 https://www.mater-rep.com/CN/Y2026/V40/I2/25010025

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