Effect of stress ratio and mean stress on high cycle fatigue behavior of the superalloy IN718 at elevated temperatures

被引：13

作者：

Pradhan, Dhananjay ^{[1
]}

Mahobia, G. S. ^{[1
]}

Chattopadhyay, K. ^{[1
]}

Fernando, D. C. ^{[2
]}

Paulose, N. ^{[2
]}

Babu, S. N. N. ^{[2
]}

Singh, V. ^{[1
]}

机构：

[1] Indian Inst Technol BHU, Dept Met Engn, Varanasi 221005, Uttar Pradesh, India

[2] DRDO, Gas Turbine Res Estab, Bangalore, Karnataka, India

来源：

MATERIALS RESEARCH EXPRESS | 2019年 / 6卷 / 09期

关键词：

stress ratio; mean stress; fatigue fracture; superalloy IN718; high cycle fatigue; CRACK-GROWTH; HOT CORROSION; FREQUENCY; ALLOY;

D O I：

10.1088/2053-1591/ab3321

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The present work shows the effect of mean stress on high cycle fatigue behavior of the superalloy IN718 at 400, 500 and 600 degrees C, at stress ratios (R) - 1, 0.5, and 0.7. Fatigue life is decreased with increase in tensile mean stress. At high mean stress, decrease in fatigue life is associated with multiple crack initiation sites at the specimen surface. Fatigue limit is highly affected by the tensile mean stress and stress ratio, R = 0.7, since the maximum stress approaches near yield stress and causes cyclic ratcheting.

引用

页数：10

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