淬火微观组织对重轨钢疲劳裂纹扩展速率的影响<sup>*</sup>

doi:10.11896/j.issn.1005-023X.2017.014.023

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Abstract Fatigue tests were conducted for standard compact tension specimens of U75V heavy rail steel via a high-frequency resonance fatigue testing machine, in order to study the influence of the rolled state′s microstructure under different cooling rates (3 ℃/s, 5 ℃/s, and air cooling) upon the crack growth rate of the stable zone (fatigue crack growth zone Ⅱ). The results show that the fatigue crack growth rate decreases with the decline of pearlite lamellar spacing. The 5 ℃/s, 3 ℃/s, and air cooling correspond to n values of 3.603 05, 3.631 18 and 3.885 28, respectively. Fracture modes of the fatigue cracks of pearlite microstructure are mainly transgranular fracture, accompanied by partial intergranular fracture. Lamellar spacing affects the deflection of the crack propagation path, and increased the degree of crack deflection subsequently enhances crack propagation impediment, which benefits the reduce of the fatigue crack growth rate.

Key words： heavy rail steel quenching microstructure high frequency fatigue crack growth rate crack propagation path

Published: 04 May 2018

CLC number:

TG156.4

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	Articles by authors
	CHEN Lin
	WANG Huijun
	GUO Feixiang

Cite this article:

CHEN Lin,WANG Huijun,GUO Feixiang. Effect of Quenching Microstructure on Fatigue Crack Growth Rate of Heavy Rail Steel[J]. Materials Reports, 2017, 31(14): 109-112.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.014.023 OR http://www.mater-rep.com/EN/Y2017/V31/I14/109

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