自回火对重轨钢疲劳裂纹扩展行为的影响

doi:10.11896/cldb.20050123

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Abstract The influence of self-tempering on the fatigue crack growth behavior of hypereutectoid rail was studied under the condition of quenching speed of 3 ℃/s, 5 ℃/s, 8 ℃/s and final cooling temperature of 450 ℃, Paris formula of fatigue crack growth rate was calculated, and the self-tempering was carried out by SEM and hardness tester the fatigue fracture of post hypereutectoid rail was observed and its hardness was tes-ted. The results show that after self-tempering, the fatigue crack growth rate of rail is accelerated, and hardness reduction, and the greater the quenching cooling rate before self-tempering, the more obvious the reduction of the anti-fatigue crack growth ability the and hardness after self-tempering, which the decrease of hardness increases the possibility of crack growth; there is no obvious threshold area after self-tempering, which will shorten the overall process of rail fatigue crack growth and accelerate the fatigue crack growth rate of quenched rail; different When ΔK=10 MPa·m^1/2, the number of fatigue striations, cleavage surfaces and secondary cracks is less, the number of river patterns is more, the area is small, and the gullies are shallow. When ΔK=13.5 MPa·m^1/2, the distance between fatigue striations increases, the cleavage surfaces and secondary cracks are more, the number and area of river patterns increase, and the fatigue crack growth rate is faster.

Key words： quenching hypereutectoid rail fatigue crack

Published: 01 July 2021

CLC number:

TG111

Fund:National Natural Science Foundation of China (51361021),Natural Science Foundation of Inner Mongolia (2019LH05016), Research Program of Science and Technology at Universities of Inner Mongolia Autonomous Region of China (NJZY20089), Inner Mongolia Science and Technology Major Project (ZDZX2018024), Innovation Fund of Inner Mongolia University of Science and Technology (2019QDL-B06).

About author:: Yaodong Cen,doctor. His main research direction is the structure and fatigue property control of metal materials.
Lin Chen, professor. The main research direction is the structure, performance control and safety evaluation of metal materials.

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	CEN Yaodong
	CHEN Lin
	DONG Rui
	ZHOU Qingfei

Cite this article:

CEN Yaodong,CHEN Lin,DONG Rui, et al. Effect of Self-tempering on Fatigue Crack Growth of Heavy Rail Steel[J]. Materials Reports, 2021, 35(12): 12136-12140.

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http://www.mater-rep.com/EN/10.11896/cldb.20050123 OR http://www.mater-rep.com/EN/Y2021/V35/I12/12136

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