扫描速度对SLM成形Ti-6Al-4V合金组织性能影响
Effects of Scanning Speed on Microstructure and Properties of SLMed Ti-6Al-4V Alloy
- 2025年45卷第3期 页码:390-395
收稿日期:2024-01-29,
修回日期:2024-02-23,
录用日期:2024-02-27,
纸质出版日期:2025-03-20
DOI: 10.15980/j.tzzz.T20240035
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收稿日期:2024-01-29,
修回日期:2024-02-23,
录用日期:2024-02-27,
纸质出版日期:2025-03-20
移动端阅览
基于模拟和试验讨论扫描速度对激光选区熔化(SLM)成形Ti-6Al-4V合金的微观组织演变、缺陷和力学性能的影响。结果表明,随着扫描速度增大,熔池深度变浅、熔化粉末与基板结合变差。SLM的快速凝固导致初生
β
柱状晶和多级针状
α
相出现,随着扫描速度增大,初生
β
晶界趋于更直和更宽,孔隙率和未熔化颗粒缺陷增多。讨论了未熔化颗粒缺陷的形成机理,发现增大激光能量输入可有效减少未熔化金属颗粒数量。此外,随着扫描速度增大,成形件抗拉强度和伸长率降低。当扫描速度为900 mm/s时,成形件抗拉强度最高,为1 238 MPa,伸长率为5.4%。
Effects of different scanning speeds on microstructure evolution, defects and mechanical properties of Ti-6Al-4V alloy formed by selective laser melting (SLM) were investigated based on simulations and experiments. The results indicate that the depth of melt pool is decreased and the bonding of melted powder to the substrate is deteriorated with increasing scanning speed. The rapid solidification of SLM leads to the appearance of primary
β
columnar crystals and multistage needle-like
α
phases, and the grain boundaries of primary
β
tend to be straighter and wider with the increase of scanning speed, while the porosity and defects in unmelted particles are increased. The formation mechanism of unmelted particle defects was discussed. The results reveal that the quantities of unmelted metal particles can be reduced effectively with increasing in the laser energy input. In addition, the tensile strength and elongation of the alloy are decreased with scanning speed increasing. The tensile strength reaches the maximum of 1 238 MPa at 900 mm/s, and elongation is 5.4%.
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