Effect of Scanning Speed on Internal Defects and Mechanical Properties ofTi-6Al-4V Alloy Processed by Selective Laser Melting
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摘要: 采用选区激光熔化（SLM）技术制备Ti-6Al-4V合金，研究了激光扫描速度（705，805，905，1 005，1 105 mm·s-1）对其内部缺陷、显微组织以及力学性能的影响。结果表明：随着扫描速度的增加，SLM成形Ti-6Al-4V合金孔洞缺陷增多，孔隙率增大；合金组织均为针片状α'马氏体，扫描速度对组织形貌影响不大；随激光扫描速度增加，合金的抗拉强度、屈服强度和显微硬度下降，伸长率变化不大；合金拉伸断裂形式均为韧性断裂，较高扫描速度下断口存在较深的拉伸裂纹以及较多的未熔颗粒和球化现象。Abstract: Ti-6Al-4V alloy was prepared by selective laser melting (SLM) technique, and the effect of laser scanning speed (705, 805, 905, 1 005, 1 105 mm·s-1) on internal defects, microstructure and mechanical properties of the alloy was studied. The results show that the pore defects and the porosity of Ti-6Al-4V alloy formed by SLM increased with the scanning speed. The alloy microstructure was composed of needle-like α' martensite, and the scanning speed had little effect on the microstructure morphology. With the increase of laser scanning speed, the tensile strength, yield strength and microhardness of the alloy decreased, and the elongation did not change much. The tensile fracture form of the alloy was ductile fracture, and there were deeper tensile cracks and more unmelted particles and spheroidization in the fracture at higher scanning speed.
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Keywords:
- selective laser melting /
- titanium alloy /
- scanning speed /
- hole /
- mechanical property
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