Effects of Crack Closure and Cyclic Deformation on Thermomechanical Fatigue Crack Growth of a Near α Titanium Alloy

被引：0
作者：
Kartik Prasad
Vikas Kumar
K. Bhanu Sankara Rao
M. Sundararaman
机构：
[1] Defence Metallurgical Research Laboratory,Mechanical Behaviour Group
[2] University of Hyderabad,School of Engineering Science and Technology
[3] Mahatma Gandhi Institute of Technology,Ministry of Steel Chair Professor, Department of Materials Engineering
[4] Indian Institute of Technology Madras,Department of Metallurgical and Materials Engineering
来源：
Metallurgical and Materials Transactions A | 2016年 / 47卷
关键词：
Crack Growth Rate; Fatigue Crack Growth; Crack Closure; Dynamic Strain Aging; Cyclic Hardening;
D O I：
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中图分类号：
学科分类号：
摘要：
In this study, closure corrected in-phase (IP) and out-of-phase (OP) thermomechanical fatigue crack growth rates at two temperature intervals viz. 573 K to 723 K (300 °C to 450 °C) and 723 K to 873 K (450 °C  to 600 °C) of Timetal 834 near α titanium alloy are presented. It is found that closure mechanisms significantly influence the stage I crack growth behavior. Surface roughness-induced crack closure (RICC) predominantly modifies the crack growth rate of near-threshold region at 573 K to 723 K (300 °C to 450 °C) test conditions. However, oxide-induced crack closure further strengthens RICC at 723 K to 873 K (450 °C to 600 °C) TMF loading. In stage II crack growth behavior, the alloy shows higher crack growth rates at 723 K to 873 K (450 °C to 600 °C) OP-TMF loading which is attributed to the combined effect of cyclic hardening occurring at the crack tip and weakening of interlamellar regions due to oxidation.
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页码：3713 / 3730
页数：17
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