Effect of Hot Isostatic Pressing on the Microstructure and Mechanical Properties of Ti-6Al-4V Alloy Fabricated by Selective Laser Melting
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摘要: 通过研究热等静压对SLM打印后Ti-6Al-4V合金的组织和性能，发现：在经过热等静压后，原始细针状相沿宽度和长度方向迅速长大，在长度方向逐渐被交错的α相截断，生长受到阻碍，而宽度方向继续生长，最终生长成为短棒状的α相。对打印后进行消除应力和HIP处理的试样，α相在长度方向保留去应力状态的形貌，而宽度略有增加。经过热等静压处理后，材料的屈服强度和抗拉强度会稍有降低，但延伸率也会同时提升。对比增加去应力的热等静压处理发现，中间增加一道去应力处理对材料力学性能没有明显影响。Abstract: The effect of hot isostatic pressing（HIP） on the microstructure and mechanical properties of Ti-6 Al-4 V alloy fabricated by selective laser melting（SLM） was studied.The results show the original acicular structure grows up rapidly along the length and width directions.Then the growth is hindered by interlaced α phase in the length direction and continues in the width direction.The structure transforms into short rod-like α phase at last.And α phase inherits the morphologies of destressing in the length direction and the width increases for the samples with destressing and HIP after SLM.The tensile strength and yield strength are lowered and the elongation is increased after HIP.The mechanical properties are not affected obviously with adding process of destressing.
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Key words:
- Ti-6Al-4V /
- hot isostatic pressing /
- selective laser melting /
- microstructure /
- mechanical properties
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