Cr<sub>3</sub>C<sub>2</sub>粒径对等离子堆焊铁基合金层组织与耐磨性能的影响

doi:10.11896/j.issn.1005-023X.2018.24.022

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Abstract Plasma surfacing with Fe50 and composite plasma surfacing with 40% (mass fraction) micron and nano Cr₃C₂ (Fe50+40% micro/nano Cr₃C₂) were prepared by plasma surfacing on low carbon steel surface. Effect of Cr₃C₂ with different dia-meter on microstructure and wear properties of Fe50 alloy plasma surfacing were comparatively studied. The phase composition of the plasma surfacing was analyzed by X-ray diffractometry (XRD), the microstructure and micro-area composition observed by scanning electron microscopy (SEM) and energy depressive spectroscopy (EDS), the hardness distribution tested by microhardness tester, and the wear performance investigated respectively by a sliding wear tester and impact wear tester. The results indicate that the microstructure of Fe50 plasma surfacing is mainly composed of columnar crystal α-Fe and its network eutectic α-Fe+Cr₂₃C₆. The solidification mode of Fe+40% micro/nano Cr₃C₂ plasma surfacing is hypereutectic, which is composed of a large number of pre-eutectic carbides and fine and uniform dendrites and eutectic structures among them, with additional phases such as γ-Fe, Cr₇C₃ and unmel-ted Cr₃C₂ ; however, the Fe+40% nano-Cr₃C₂ coating precipitates more than the pre-eutectic carbide of Fe+40% micron Cr₃C₂ coating,which is, furthermore finer, and denser. Compared with Fe50 plasma surfacing coating, the microhardness, sliding wear performance and impact wear performance of Fe+40% micron Cr₃C₂ coating were increased by 21%, 1.5 times and 0.8 times, respectively; whereas the performances of Fe+40% nano Cr₃C₂ coating were increased by 34.1%, 2.4 times and 1.7 times respectively,whose furrow, spalling and plastic deformation were significantly reduced, while the wear resistance notably improved.

Key words： Cr₃C₂ grain size plasma surfacing Fe50 alloy microstructure wear resistance

Published: 23 January 2019

CLC number:

TH117.1

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	Articles by authors
	XIAO Yi
	XU Chengyi
	Ryou Min
	CAO Jian

Cite this article:

XIAO Yi,XU Chengyi,Ryou Min, et al. Effect of Cr₃C₂ Grain Size on the Microstructure and Wear Performance of Fe-based Alloy Plasma Transferred Arc Surfacing[J]. Materials Reports, 2018, 32(24): 4329-4333.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.24.022 OR http://www.mater-rep.com/EN/Y2018/V32/I24/4329

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