感应加热40Cr表面Cr-Al共渗组织及其性能分析

doi:10.11896/cldb.18040083

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Abstract Chromaluminized layer was prepared by electromagnetic induction heating on the surface of the 40Cr steel. The microstructures and properties were carried out and compared with the traditional box type furnace. The difference between both processes and the mechanism of induction heating chromaluminizing were discussed. The results show that, the above two processes produced different phases. The induction heating layer is mainly composed of FeCr phase, while the box type furnace heating layer mainly presents FeAl phase and has more oxides. Induction heating has faster diffusion rate and thicker layer depth which is about 362 μm, and the bonding part between the layer and substrate is alloy pearlite accompanied by carbon deficiency. However, the thickness of the box type furnace layer is only 20 μm, and there is a rich carbon zone at the interface of the substrate and layer. Both chromaluminized layers can improve the corrosion resistance in the mixed aqueous solution of H₂SO₄ and Na₂SO₄. Induction heating chromaluminized layer also indicates an improved corrosion resistance in NaCl compared with the box type furnace sample and substrate.

Key words： induction heating chromaluminizing thermal diffusion microstructure corrosion resistance

Published: 12 September 2019

CLC number:

TB31

Fund:This work was financially supported by the National Natural Science Foundation of China (51575073), International S&T Cooperation Program of China (2015DFR70480), Chongqing Science & Technology Commission(cstc2014gjhz70003,cstc2017jcyjBX0031) and Chongqing University Innovation Team Construction Project (CXTDG20162017).

About author:: Jianjun Hu, a professor at the Chongqing University of Technology. Mainly engaged in gear surface engineering new technology and mold CAD/CAM research. Presided over one items of National Natural Science Foundation of China and six items of Chongqing municipal projects. Participating in the national international cooperation special projects and other major projects, more than 20 items. He has published more than 80 journal papers, three testbook in public, obtained 25 authorized patents and 7 of which are invention patents. In addition, he has acquired two awards of Scientific and Technological Progress in Chongqing.

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	HU Jianjun
	ZHANG Yuqing
	GUO Ning
	YANG Xian
	LI Hui
	JIN Yan

Cite this article:

HU Jianjun,ZHANG Yuqing,GUO Ning, et al. Microstructures and Properties of Chromaluminized Layer on 40Cr Steelby Induction Heating[J]. Materials Reports, 2019, 33(21): 3552-3555.

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http://www.mater-rep.com/EN/10.11896/cldb.18040083 OR http://www.mater-rep.com/EN/Y2019/V33/I21/3552

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