Evaluation of multiaxial low cycle fatigue strength for Mod.9Cr-1Mo steel under non-proportional loading

被引：0

作者：

Itoh, Takamoto ^{[1
]}

Fukumoto, Kenichi ^{[2
]}

Hagi, Hideki ^{[3
]}

Itoh, Akira ^{[4
]}

Saitoh, Daichi ^{[2
]}

机构：

[1] Div. of Mech. Eng., Graduate School of Eng., Univ. of Fukui, Bunkyo, Fukui

[2] Research Inst. of Nuclear Eng., Univ. of Fukui, Bunkyo, Fukui

[3] Div. of Mech. Eng., Fukui Univ. of Tech., Gakuen, Fukui

[4] Graduate School of Eng., Univ. of Fukui, Bunkyo, Fukui

来源：

Zairyo/Journal of the Society of Materials Science, Japan | 2013年 / 62卷 / 02期

关键词：

Life evaluation; Low cycle fatigue; Mod. 9Cr-1Mo steel; Multiaxial stress state; Non-proportional loading;

D O I：

10.2472/jsms.62.110

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This study discusses multiaxial low cycle fatigue strength of Mod.9Cr-1Mo steel under proportional and non-propoitional loadings at room and high (823K) temperatures. Strain-controlled multiaxial low cycle fatigue tests were perfoemed using a hollow cylinder specimen including interruption tests. Strain paths employed were a push-pull straining, a reversed torsion straining and a circle straining. The former two are the proportional loadings where principal directions of stress and strain are unchanged. The latter one is the non-proportional loading where axial and shear strains have 90 degree phase difference and principal directions of stress and strain are changed continuously in a cycle. Behaviors of cyclic deformations and failure lives and an evaluation of the failure life are discussed. Surface cracks and microstructures in fatigued specimens are also observed by a digital microscope and a transmission electron microscope (TEM) in order to investigate mechanisms of cyclic deformation, failure and reduction in failure life due to non-proportional loading. © 2013 The Society of Materials Science, Japan.

引用

页码：110 / 116

页数：6

共 21 条

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