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首页> 外文会议>European Powder Metallurgy Association;Euro PM congress exhibition >Selective Laser Melting and Spark Plasma Sintering of Tool Steel-PSZ Composite powders prepared by Mechanical Alloying: a Comparative Study
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Selective Laser Melting and Spark Plasma Sintering of Tool Steel-PSZ Composite powders prepared by Mechanical Alloying: a Comparative Study

机译：机械合金化制备工具钢-PSZ复合粉末的选择性激光熔化和等离子烧结：比较研究

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摘要

Mechanically alloyed (MA) nanocomposite-powders of Tool Steel-10vol% Partially Stabilized Zirconia(PSZ) were subjected to Laser Powder Bed Fusion (LPBF) to evaluate the feasibility of fabricating toolsteel composites using selective laser melting (SLM). MA led to particle size and microstructuralrefinement. A homogenous dispersion of PSZ in steel matrix was achieved, microhardness of MApowders was increased due to the synergetic effects of microstructural refinement, strain hardening anddispersion hardening. After SLM, meta-stable tetragonal-phase was the major constituent for PSZconfirming the possible toughening effect of stress-induced volume-expansive tetragonal-to-monoclinicphase transformation. Results were compared with that of SLM-processed H13 and Spark PlasmaSintered (SPS) parts processed from the same composite-powders. Compared to the unreinforced-H13,the composites exhibited higher microhardness due to the dispersion hardening by PSZ particles andmicrostructural refining. Relative densities of the SLM composites were lower than that of theunreinforced-H13 and SPS-counterparts suggesting the need of further SLM-processing.
机译：工具钢的10vol％部分稳定的氧化锆机械合金化（MA）纳米复合粉末 （PSZ）进行激光粉末床融合（LPBF）以评估制造工具的可行性 选择性激光熔化（SLM）的钢复合材料。 MA导致粒径和微观结构 细化。实现了PSZ在钢基质中的均匀分散，MA的显微硬度 由于微结构细化，应变硬化和 分散硬化。在SLM之后，亚稳态四方相是PSZ的主要成分 证实了应力诱导的体积膨胀四方体到单斜体的可能的增韧作用 相变。将结果与SLM处理的H13和Spark Plasma进行了比较 由相同的复合粉末加工而成的烧结（SPS）零件。与未增强的H13相比， 由于PSZ颗粒的分散硬化，复合材料表现出较高的显微硬度。 显微组织细化。 SLM复合材料的相对密度低于SLM复合材料的相对密度。 未增强的H13和SPS对应部件建议需要进一步的SLM处理。

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