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

Abstract
Figure/Table
References
Related Citation (7)

Download:

Full Text ( PDF ) (1602KB)
Export: BibTeX | EndNote (RIS)

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: 25 July 2017 Online: 2018-05-04

CLC number:

TG156.4

	Service
	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	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.

URL:

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

1 Christopher J L, Diana A L. Effects of processing residual stresses on fatigue crack growth behavior of structural materials: Experimental approaches and microstructural mechanisms[J]. Metall Mater Trans A,2012,43(1):87.
2 Tang D, Yang L, Wu H B, et al. Effects of microstructure on fatigue crack propagation behavior of bainite steel[J]. Mater Sci Technol,2013,21(6):60(in Chinese).
唐荻, 杨柳, 武会宾, 等. 微观组织对贝氏体钢疲劳裂纹扩展行为的影响[J].材料科学与工艺,2013,21(6):60.
3 Ma Y J, Li J W, Lei J F, et al. Influence of microstructure on fatigue crack propagating path and crack growth rates in TC4ELI alloy[J]. Acta Metall Sin,2010,46(9):1086(in Chinese).
马英杰,李晋炜,雷家峰,等.显微组织对TC4ELI合金疲劳裂纹扩展路径及扩展速率的影响[J].金属学报,2010,46(9):1086.
4 Yu Y, Gu J L, Shou F L, et al. Competition mechanism between microstructure type and inclusion level in determining VHCF beha-vior of bainite/martensite dual phase steels[J]. Int J Fatigue,2011,33(3):500.
5 Zhao P,Gao G H,Misrac R D K,et al. Effect of microstructure on the very high cycle fatigue behavior of a bainite/martensite multiphase steel[J]. Mater Sci Eng A,2015,630:1.
6 Iacoviello F, Cocco V D, Rossi A, et al. Fatigue crack tip damaging micromechanisms in pearlitic ductile cast irons[J]. Fatigue Fracture Eng Mater Struct,2015,38(2):238.
7 Iacoviello F, Cocco V D, Cavallini M. Fatigue crack propagation and overload damaging micromechanisms in a ferritic-pearlitic ductile cast iron[J]. Fatigue Fracture Eng Mater Struct,2016,38(8):999.
8 Chen L, Wang H J, Chen K Y, et al.Calculation of heat transfer coefficient of heavy rail steel in quenching process based on finite element method[J]. Special Steel,2016,37(4):13(in Chinese).
陈林,王慧军,陈昆宇,等.基于有限元法计算重轨钢轨淬火过程的换热系数[J].特殊钢,2016,37(4):13.
9 Kang Hao. Experimental study key technologies of U75V rail-line heat treatment process [D]. Shenyang: Northeastern University,2012(in Chinese).
康皓.U75V重轨在线热处理工艺关键技术的实验研究[D].沈阳:东北大学,2012.
10 Korda Akhmad A, Mutoh Y, et al. Effects of pearlite morphology and specimen thickness on fatigue crack growth resistance in ferritic-pearlitic steels[J].Mater Sci Eng,2006428(1-2):262.
11 Hui W J, Zhang Y J, Zhao X L,et al. High cycle fatigue behavior of V-microalloyed medium carbon steels:A comparison between bainitic and ferritic-pearlitic microstructures[J].Int J Fatigue,2016,91(1):232.
12 Paris P C, Erdogan F A.Critical anglysis of crack growth laws[J].J Basic Eng,Trans ASTM(Series D),1963,85(3):528.
13 Maya-Johnson S,Ramirez A J,Toro A. Fatigue crack growth rate of two pearlitic rail steels[J]. Eng Fracture Mech,2015,138:63.
14 Nasim L, Jim B, Martin S. The effect of anisotropy on crack propagation in pearlitic rail steel[J]. Wear,2014,314(1-2):57.
15 Hui W J, Chen S L, Zhang Y J,et al. Effect of vanadium on the high-cycle fatigue fracture properties of medium-carbon microalloyed steel for fracture splitting connecting rod[J]. Mater Des,2015,66(Part A):227.