Effect of Deep Cryogenic Treatment Time on Red Hardness of M2 High Speed Steel

doi:10.11901/1005.3093.2020.176

Chinese Journal of Materials Research

2021, Vol. 35

Issue (1): 17-24 DOI: 10.11901/1005.3093.2020.176

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Effect of Deep Cryogenic Treatment Time on Red Hardness of M2 High Speed Steel

DUAN Yuanman¹, ZHU Lihui¹(

), WU Xiaochun¹, GU Bingfu²

^1.School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
^2.Jiangsu Fuda Special Steel Co, Ltd, Yangzhong 212200, China

Cite this article:

DUAN Yuanman, ZHU Lihui, WU Xiaochun, GU Bingfu. Effect of Deep Cryogenic Treatment Time on Red Hardness of M2 High Speed Steel. Chinese Journal of Materials Research, 2021, 35(1): 17-24.

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Abstract

The effect of deep cryogenic treatment time on the room temperature hardness and red hardness of M2 high speed steel was investigated by means of Rockwell hardness tester, X-ray diffractometer, scanning electron microscope and transmission electron microscope. The results show that the room-temperature hardness and red hardness of M2 steel were improved by deep cryogenic treatment, and the red hardness at 650℃ was improved most significantly after deep cryogenic treatment for 12 hours. With the increasing deep cryogenic time, the amount of retained austenite decreased, the shape of retained austenite between martensitic laths changed from strip-like to film-like, the axial ratio and carbon content of martensite decreased gradually, and twin martensite was thinned; the segregation of primary carbides alleviated, and the amount of secondary carbides increased. The increase in the amount of secondary carbides can enhance the precipitation strengthening, and inhibit the decomposition of martensite at high temperatures. In addition, the further transformation of retained austenite to martensite and the thinning of twin martensite also favor the enhancement of room-temperature hardness and red hardness.

Key words: metallic materials M2 high speed steel deep cryogenic treatment red hardness microstructure carbide

Received: 20 May 2020

ZTFLH:

TG430.40

Fund: National Key Research and Development Program of China(2016YFB0300403);Jinshan Talents Plan of Zhenjiang in 2017, Innovation and Entrepreneurship Talents Plan of Jiangsu Province in 2018

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	Yuanman DUAN
	Lihui ZHU
	Xiaochun WU
	Bingfu GU

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https://www.cjmr.org/EN/10.11901/1005.3093.2020.176 OR https://www.cjmr.org/EN/Y2021/V35/I1/17

Table 1 Chemical composition of M2 high speed steel (%, mass fraction)

Fig.1 Hardness (a) and red hardness (b) of M2 high speed steel after deep cryogenic for different time

Fig.2 SEM images of M2 high speed steel after deep cryogenic for 0 h (a), 1 h (b), 4 h (c), 8 h (d) and 12 h (e)

Table 2 Classification of carbides on the basis of size in M2 high speed steel under different deep cryogenic time

Fig.3 TEM images of M2 high speed steel after deep cryogenic treatment for 1 h (a) and 12 h (b)

Fig.4 XRD patterns of M2 high speed steel after deep cryogenic for different time

Table 3 Retained austenite amount in M2 high speed steel under different deep cryogenic time

Fig.5 Morphology of retained austenite in M2 high speed steel after deep cryogenic treatment for 1 h (a) bright field image; (b) dark field image and electron diffraction pattern

Fig.6 Morphology of retained austenite in M2 high speed steel after deep cryogenic treatment for 12 h (a) bright field image; (b) dark field image and electron diffraction pattern

Fig.7 XRD spectrum of M (211) after Gaussian fitting of M2 high speed steel after deep cryogenic for different time

Table 4 The axial ratio and carbon content of martensite in M2 high speed steel under different deep cryogenic time

Fig.8 Effect of deep cryogenic time on amount of carbides (a) and XRD patterns of carbides (b) in M2 high speed steel

Fig.9 Morphology and EDS spectrum of secondary carbides in M2 high speed steel after deep cryogenic for 12 h

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