The turning point in Paris region of fatigue crack growth in titanium alloy

Acta Metall Sin

2008, Vol. 44

Issue (8): 973-978 DOI:

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The turning point in Paris region of fatigue crack growth in titanium alloy

中科院金属所

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. The turning point in Paris region of fatigue crack growth in titanium alloy. Acta Metall Sin, 2008, 44(8): 973-978 .

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Abstract In this article, the turning point in Paris region of lamellar microstructure has been investigated. After testing fatigue crack growth rate of different lamellar structures with various microstructure dimensions, we finally found that β grain size is the most important parameter to affect the position of turning point. The essential reason of turning point appearance was explained through the analyse of micro-stage in fatigue crack growth (FCG) and changing of fracture mode. Fatigue crack growth rate of martensite structure with β grain has been tested, and no turning point exists in Paris region, it reflects that the existence of β grain is not the single reason for the appearance of turning point. The actual dimension of crack tip plastic zone (CTPZ) has also been discussed in constrast to the size of Irwin single CTPZ and Rice cyclical CTPZ.

Key words: Titanium alloy Fatigue crack growth Turning point in Paris region

Received: 14 December 2007

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