EFFECTS OF SMALL PRESTRAIN ON THE FATIGUE BEHAVIOR OF SPHEROIDAL PEARLITE STEEL

被引：4

作者：

NAGASE, Y

KANRI, T

机构：

[1] Department of Mechanical Engineering, Shizuoka University, Hamamatsu, 432

[2] Mitsubishi Electric Co, Oshika

来源：

FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES | 1992年 / 15卷 / 02期

关键词：

D O I：

10.1111/j.1460-2695.1992.tb00050.x

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

In order to clarify the effect of a small prestrain on the fatigue strength of a carbon steel, the fatigue behaviour of plain specimens of a eutectoid steel with spheroidal pearlite, previously subjected to a tensile prestrain, is investigated and compared with that of annealed and strain-aged specimens. It is found that a small prestrain of a few percent does not decrease the fatigue limit nor the crack initiation or propagation lives. Fatigue slip initiation, however, is accelerated by the small prestrain. It is also observed that cyclic strain ageing does not occur. From these results, it is inferred that dislocations are unpinned by the small prestrain and this causes fatigue slip to occur more readily, but the fatigue behaviour following slip initiation is not affected because the spheroidal cementite particles act as obstacles to further slip deformation and Stage I crack propagation.

引用

页码：213 / 223

页数：11

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