Research on Process and Microstructure Formation of W-Ni-Fe Alloy Fabricated by Selective Laser Melting
Research on Process and Microstructure Formation of W-Ni-Fe Alloy Fabricated by Selective Laser Melting
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DOI：
10.1007/s11665-010-9720-3
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发表时间：
2011-08
影响因子：
2.3
通讯作者：
D. Zhang;Q. Cai;Jinhui Liu;Rui-di Li
中科院分区：
文献类型：
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作者：
D. Zhang;Q. Cai;Jinhui Liu;Rui-di Li
W-Ni-Fe合金是一种重要的实用材料，但目前通常采用传统的粉末冶金方法制备，难以制备复杂形状的W-Ni-Fe合金。本文提出了一种选择性激光熔化（SLM）工艺制备W-Ni-Fe合金零件。通过优化工艺条件，得到了合理选择激光参数的工艺图。研究了不同激光能量输入下激光加工样品的显微结构。在SLM过程中存在两种共存的形成机制：（i）Ni和Fe粉末完全熔化但W粉末不熔化的液相烧结（LPS）和（ii）W粉末完全熔化的熔化/凝固。随着激光能量的增加，成形机制有从LPS向完全熔化/凝固转变的趋势。
W-Ni-Fe alloys are important materials for many practical applications; however, at present, they are usually fabricated by conventional powder metallurgy techniques, which is difficult in fabrication with complex shapes. In this work, a selective laser melting (SLM) processing method was developed for fabricating W-Ni-Fe alloys parts. A process map was obtained for selection of proper laser parameters by optimizing processing conditions. Microstructures of laser fabricated samples in different laser energy inputs were investigated. There are two coexisting forming mechanisms in the SLM process: (i) liquid phase sintering (LPS) with full melting of Ni and Fe powders but non-melting of W powders and (ii) melting/solidification with full melting of W powders. Moreover, with increasing laser energy, a transition trend of forming mechanism from LPS to full melting/solidification can be observed.