In-situ Study of Microcrack Initiation and Propagation of M2 High Speed Steel

doi:10.11901/1005.3093.2021.405

Chinese Journal of Materials Research

2022, Vol. 36

Issue (5): 365-372 DOI: 10.11901/1005.3093.2021.405

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In-situ Study of Microcrack Initiation and Propagation of M2 High Speed Steel

HU Haibo¹, ZHU Lihui¹(

), DUAN Yuanman¹, 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:

HU Haibo, ZHU Lihui, DUAN Yuanman, WU Xiaochun, GU Bingfu. In-situ Study of Microcrack Initiation and Propagation of M2 High Speed Steel. Chinese Journal of Materials Research, 2022, 36(5): 365-372.

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Abstract

The tensile behavior of M2 high speed steel was studied by using an in-situ loading platform in scanning electron microscope (SEM). The results show that during the in-situ tensile process, microcracks mainly initiate and propagate at the interface between large eutectic carbide and the matrix of M2 high speed steel. Compared with the tempered martensite, cracks initiate more easily on the retained austenite. The size, shape and type of carbides also have important effect on the initiation and propagation of microcracks. It follows that reducing the amount and the size of massive residual austenite, primary eutectic carbides, and MC carbides, as well as appropriately adjusting the shape of carbides can slow down the initiation and propagation of microcracks.

Key words: metallic materials M2 high speed steel in-situ tensile test microcracks initiation and propagation carbide

Received: 14 July 2021

ZTFLH:

TG430.40

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

About author: ZHU Lihui, Tel: 13564632476, E-mail: lhzhu@i.shu.edu.cn

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	Haibo HU
	Lihui ZHU
	Yuanman DUAN
	Xiaochun WU
	Bingfu GU

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https://www.cjmr.org/EN/10.11901/1005.3093.2021.405 OR https://www.cjmr.org/EN/Y2022/V36/I5/365

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

Fig.1 Shape and dimensions of the in-situ tensile specimen

Fig.2 SEM images and EDS analysis of M2 high speed steel after quenching and tempering

Fig.3 TEM images of microstructure in M2 high speed steel after quenching and tempering (a) bright field image; (b) dark field image of martensite; (c) dark field image of austenite; (d) electron diffraction patterns

Fig.4 Stress-strain curve of M2 high speed steel during in-situ tensile test

Fig.5 Initiation and propagation of microcracks (a) σ=180 MPa; (b) (c) σ=442 MPa; (d) (e) σ=646 MPa

Fig.6 Microcracks initiated in the matrix and EDS analysis

Fig.7 Load-displacement curves for nano indentation of cracked area (region 1) and uncracked area (region 2)

Fig.8 Morphology of microcracks induced by carbides (a) separation of carbides and matrix; (b) fracture of carbide

Fig.9 Statistics of microcracks generated at the interfaces between matrix and carbides with different shapes (a) typical morphology of carbides with different shapes; (b) comparison of cracking rates

Fig.10 Fracture morphology and EDS area scanning of large-size carbide (a) morphology of cracked carbide; (b) schematic diagram of fractured carbide; (c) EDS analysis

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