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首页> 外文期刊>Journal of Materials Engineering and Performance >Comparative Analysis of the Microstructural Features of 28 wt.% Cr Cast Iron Fabricated by Pulsed Plasma Deposition and Conventional Casting
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Comparative Analysis of the Microstructural Features of 28 wt.% Cr Cast Iron Fabricated by Pulsed Plasma Deposition and Conventional Casting

机译：28重量％的微观结构特征对比分析。脉冲等离子体沉积和常规铸造制造的％Cr铸铁

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摘要

The effect of pulsed plasma deposition (by an electrothermal axial plasma accelerator) followed by post-heat treatment on the structure and microhardness of a 28 wt.% Cr white cast iron is analyzed and discussed with respect to the microstructure of the conventionally cast monolithic counterpart. The cast iron (as deposited on a 14 wt.% Cr cast iron substrate) had a microhardness of 630-750 HV0.05; it had layered light contrast/dark contrast structure where dark contrast layers contain fine carbide network. Pulsed plasma deposition followed by heat treatment resulted in a substantial refinement of the microstructure: eutectic M7C3 coarse acicular plates in the conventional cast iron were replaced by fine M7C3, M3C2, M3C particles (Cr depleted in favor of Fe), while the initial carbide particle of 2-3 mu m was reduced to 0.6 mu m. Secondary dendrite arm spacing decreased from 15 to 1.3 mu m, accordingly. The carbide volume fraction in the post-heat-treated coating remarkably increased with respect to the conventional counterpart resulting in a substantial increase in the coating hardness (1300-1750 HV0.05). The heat-treated coating displayed higher resistance to three-body abrasion than the as-deposited coating and similar resistance with that of the conventionally cast iron.
机译：脉冲等离子体沉积（通过电热轴向等离子体促进剂）的效果，然后进行28重量％的结构和微硬度的热处理和微硬度。关于常规铸造整体对应的微观结构分析和讨论％Cr白色铸铁。铸铁（沉积在14重量％Cr铸铁底物上）的微硬度为630-750 HV0.05;它具有层状光对比度/暗对比结构，其中暗对比层含有细碳化物网络。脉冲等离子体沉积，然后进行热处理导致微观结构的大量细化：传统铸铁中的共晶M7C3粗针形板被细m7c3，m3c2，m3c颗粒（Cr耗尽有利于Fe），而初始碳化物颗粒2-3亩m减少到0.6μm。次级树枝状臂间距从15至1.3μm降低。后热处理涂层中的碳化物体积分数相对于常规对应物显着增加，导致涂层硬度（1300-1750 HV0.05）的显着增加。热处理涂层比沉积的涂层和与常规铸铁的相似性显示出高于三体磨损的耐受性更高。

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