Effect of specimen size on bending fatigue behavior of a new kind of micro-alloyed forging steel

Chin J Mater Res

2009, Vol. 23

Issue (4): 444-448 DOI:

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Effect of specimen size on bending fatigue behavior of a new kind of micro-alloyed forging steel

ZHAO Yang; CHEN Liqing; LIU Xianghua

State Key Laboratory of Rolling and Automation; Northeastern University; Shenyang 110004

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ZHAO Yang CHEN Liqing LIU Xianghua. Effect of specimen size on bending fatigue behavior of a new kind of micro-alloyed forging steel. Chin J Mater Res, 2009, 23(4): 444-448.

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Abstract

The three–point–bending fatigue behaviors of a new kind of Nb+V micro–alloyed forging steel for truck front axle have been studied by hydraulic servo fatigue testing machine. The effects of specimen size on the fatigue behavior and its origin have been considered. The S–N curves were plotted and the fatigue cracked surfaces were analyzed by SEM. The results showed that the specimen size has a significant influence on three–point–bending fatigue limit. The three–point–bending fatigue limit of specimen increased with decreasing the specimen size. There is little effect of specimen size on the morphology of fatigue fractured surfaces. The reasons for this specimen size effect are that there exist stress gradient in specimen for three–point–bending fatigue test and that the stress gradient in a smaller specimen is larger than that in a larger one.

Key words: metallic materials three–point–bending fatigue specimen size effect micro–alloying forging steel

Received: 16 January 2009

ZTFLH:

TG111

Fund:

Supported by Program for New Century Excellent Talents in University No.NCET-06-0285 and Foundation for Innovation Team, the Education Department, Liaoning Province.

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	DIAO Yang
	CHEN Li-Qing
	ZHANG Fu-Bei
	LIU Xiang-Hua

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https://www.cjmr.org/EN/ OR https://www.cjmr.org/EN/Y2009/V23/I4/444

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