INFLUENCES OF MICROSTRUCTURE ON FATIGUE CRACK PROPAGATING PATH AND CRACK GROWTH RATES IN TC4ELI ALLOY

doi:10.3724/SP.J.1037.2010.00155

Acta Metall Sin

2010, Vol. 46

Issue (9): 1086-1092 DOI: 10.3724/SP.J.1037.2010.00155

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INFLUENCES OF MICROSTRUCTURE ON FATIGUE CRACK PROPAGATING PATH AND CRACK GROWTH RATES IN TC4ELI ALLOY

MA Yingjie¹⁾, LI Jinwei²⁾, LEI Jiafeng¹⁾, TANG Zhenyun²⁾, LIU Yuyin¹⁾, YANG Rui¹⁾

1) Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
2) AVIC Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024

Cite this article:

MA Yingjie LI Jinwei LEI Jiafeng TANG Zhenyun LIU Yuyin YANG Rui. INFLUENCES OF MICROSTRUCTURE ON FATIGUE CRACK PROPAGATING PATH AND CRACK GROWTH RATES IN TC4ELI ALLOY. Acta Metall Sin, 2010, 46(9): 1086-1092.

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Abstract

Long fatigue crack propagating path in TC4ELI alloy with lamellar microstructure was studied by SEM. Statistics of angles between cracking path and α lamella exhibits that fatigue crack is apt to parallel α lamella or cross α lamella vertically, which will induce the ladder shape of crack propagating path. The parallel and vertical propagating patterns were interpreted with the weak α/β interface and the orientation of hcp α-Ti unit cell. Analysis of crack propagating path helps to understand the effect of microstructure on fatigue crack growth (FCG) rates. FCG rates tests with different microstructures reveal that in near fatigue crack threshold (ΔK_th) region the thickness of α lamella is the main influential factor on fatigue crack growth rate da/dN, and the da/dN seems impervious to β grain size. However, in Paris region the FCG rates are both influenced by grain size and lamellar thickness.

Key words: titanium alloy microstructure crack propagating path crack growth rate

Received: 02 April 2010

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	MA Yang-Jie
	LEI Jia-Feng
	YANG Rui
	LI Jin-Wei
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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2010.00155 OR https://www.ams.org.cn/EN/Y2010/V46/I9/1086

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