The influence of microstructural morphology and prestrain on fatigue crack propagation of dual-phase steels in the near-threshold region

被引：14

作者：

Nakajima, K ^{[1
]}

Kamiishi, S ^{[1
]}

Yokoe, M ^{[1
]}

Miyata, T ^{[1
]}

机构：

[1] Nagoya Univ, Dept Mat Sci & Engn, Nagoya, Aichi 46401, Japan

来源：

ISIJ INTERNATIONAL | 1999年 / 39卷 / 05期

关键词：

fatigue; large crack; crack propagation; crack closure; heat treatment; microstructural morphology; prestrain; fractography; laser microscopy; dual phase steel;

D O I：

10.2355/isijinternational.39.486

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The influence of microstructure and prestrain on fatigue crack propagation in the near threshold region was studied for dual-phase steels with different microstructural morphologies. The material with martensite phases dispersed in ferrite matrix exhibited a higher nominal stress intensity range and a lower crack propagation rate than those of material with a continuous martensite phase around ferrite grains. Prestrain prior to fatigue testing resulted in a decrease of nominal stress intensity range in both materials. However there was a slight difference among all the materials in the effective stress intensity range. The microstructural morphology and prestrain exerted a great influence on crack path and that caused a large difference in crack closure. A quantitative correlation existed between crack closure level and surface roughness of fatigue fracture.

引用

页码：486 / 492

页数：7

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