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

被引：10
作者：
Prasad, Kartik [1 ,2 ]
Kumar, Vikas [1 ]
Rao, K. Bhanu Sankara [3 ]
Sundararaman, M. [4 ]
机构：
[1] Def Met Res Lab, Mech Behav Grp, Hyderabad 500058, Andhra Pradesh, India
[2] Univ Hyderabad, Sch Engn Sci & Technol, Hyderabad 500134, Andhra Pradesh, India
[3] Mahatma Gandhi Inst Technol, Dept Mat Engn, Hyderabad 500075, Andhra Pradesh, India
[4] Indian Inst Technol, Dept Met & Mat Engn, Madras 600036, Tamil Nadu, India
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2016年 / 47A卷 / 07期
关键词：
AEROENGINE COMPRESSOR DISKS; LIFE PREDICTION; FLOW BEHAVIOR; MODE-I; FRACTURE; TEMPERATURE; PROPAGATION; DAMAGE; TIMETAL-834; CREEP;
D O I：
10.1007/s11661-016-3482-y
中图分类号：
T [工业技术];
学科分类号：
08 ;
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 A degrees C to 450 A degrees C) and 723 K to 873 K (450 A degrees C to 600 A degrees C) of Timetal 834 near alpha 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 A degrees C to 450 A degrees C) test conditions. However, oxide-induced crack closure further strengthens RICC at 723 K to 873 K (450 A degrees C to 600 A degrees C) TMF loading. In stage II crack growth behavior, the alloy shows higher crack growth rates at 723 K to 873 K (450 A degrees C to 600 A degrees 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：18
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