Microstructure study of direct laser fabricated Ti alloys using powder and wire
Microstructure study of direct laser fabricated Ti alloys using powder and wire
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DOI：
10.1016/j.apsusc.2006.02.028
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发表时间：
2006-11
影响因子：
6.7
通讯作者：
Fude Wang;Junfa Mei;Xinhua Wu
中科院分区：
文献类型：
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作者：
Fude Wang;Junfa Mei;Xinhua Wu
采用直接激光制造 (DFL) 技术制造出了成分梯度材料。将两种类型的原料同时送入激光焦点，即阻燃 (BurTi) 合金 Ti–25V–15Cr–2Al–0.2C 粉末和 Ti–6Al–4V 丝。通过改变粉末的进给速率同时保持焊丝进给的固定进给速率来改变粉末与焊丝的比率，从而改变合金的局部成分。对于约 20% 至 100% BurTi 之间的成分范围，仅观察到 β 相，并且成分和晶格参数单调变化。我们发现这些功能梯度样品的晶粒尺寸比激光制造的 Ti64 样品要细得多。一些样品是单独使用送丝制造的，结果发现其微观结构与单独使用送粉时发现的微观结构不同。结果根据激光制造粉末和线材样品的功率要求进行了讨论。
A compositionally graded material has been fabricated using direct laser fabrication (DFL). Two types of feedstock were fed simultaneously into the laser focal point, a burn resistant (BurTi) alloy Ti–25V–15Cr–2Al–0.2C powder and a Ti–6Al–4V wire. The local composition of the alloy was changed by altering the ratio of powder to wire by varying the feed rate of the powder whilst maintaining a fixed feed rate of wire-feed. For the range of compositions between about 20% and 100% BurTi only the beta phase was observed and the composition and lattice parameter varied monotonically. The grain size was found to be much finer in these functionally graded samples than in laser fabricated Ti64. Some samples were made using the wire-feed alone, where it was found that the microstructure is different from that found when using powder feed alone. The results are discussed in terms of the power requirements for laser fabrication of powder and wire samples.