调质前后Cr5锻钢支承辊碳化物

doi:10.13228/j.boyuan.issn0449-749x.20130725

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Abstract The effect of quenching (970 ℃) and tempering (540 ℃) on microstructure and style of carbide in Cr5 forged steel backup roll were studied by SEM and TEM. The [ΔH] and [ΔG] of formation and transformation were calculated by thermodynamic theories during this process. The results indicate that the matrix was pearlite, and the size of carbides was about 700~800 nm, complex hexagonal M7C3 and cubic M23C6 had the crystallographic orientation relationship of ([1120])K//([011])α, [0001]K//[011]α and (511)K//([011])α, [[116]]K//[[011]]α with ferrite respectively. After quenching and tempering, the matrix microstructure was tempered sorbite, and a little of tempered martensite with undissolved carbides. The size of carbides decreased obviously which was about 200 nm. The carbide style transformed to orthorhombic M7C3and had the crystallographic orientation relationship of ([113])K//(200)α、[[512]]K//[[011]]α with ferrite. In addition, the [ΔH] and [ΔG] of formation and transformation of carbides were both below zero during this process.

Received: 24 December 2013 Published: 10 September 2014

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TG142.1

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	YUE Shen-Wei
	YUE Zong-He
	YU Wen-Yan
	XIE Jing-Pei

Cite this article:

YUE Shen-Wei,YUE Zong-He,YU Wen-Yan等. Carbides of Cr5 Forged Steel Backup Roll Before and After Quenching and Tempering[J]. Iron and Steel, 2014, 49(9): 71-76.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20130725 OR http://www.chinamet.cn/Jweb_gt/EN/Y2014/V49/I9/71

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