Fatigue crack growth behavior of ultrafine-grained nickel produced by high pressure torsion

被引：6
作者：
Leitner, T. [1 ]
Hohenwarter, A. [1 ]
Pippan, R. [2 ]
机构：
[1] Univ Leoben, Dept Mat Phys, Jahnstr 12, A-8700 Leoben, Austria
[2] Austrian Acad Sci, Erich Schmid Inst Mat Sci, A-8700 Leoben, Austria
来源：
20TH EUROPEAN CONFERENCE ON FRACTURE | 2014年 / 3卷
关键词：
High pressure torsion; Sever plastic deformation; Ultrafine-grained; Nickel; Fatigue crack growth; SEVERE PLASTIC-DEFORMATION; DEFORMED NICKEL; MICROSTRUCTURE; PROPAGATION; SATURATION; ALLOYS; METALS;
D O I：
10.1016/j.mspro.2014.06.170
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
In this work the fatigue crack growth behavior of ultrafine-grained high purity nickel, produced by high pressure torsion, was studied. Fatigue crack growth curves of samples with different orientations were measured at two stress ratios. It was found that cracks propagating in two specific directions of the HPT disc show differences up to a factor of four in their fatigue crack growth rate and also deviations in their Delta K-th values. By the analysis of stereophotogrammetric images of the fracture surfaces, crack branching and crack deflection were found to be active crack tip shielding mechanisms. Only a small influence of the stress ratio has been observed. (C) 2014 Elsevier Ltd.
引用
收藏
页码：1044 / 1049
页数：6
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