Study on micro-mechanism of crack initiation and propagation induced by inclusion in ultra-high strength steel

被引：7

作者：

Zeng, Yanping ^{[1
]}

Fan, Hongmei ^{[1
]}

Wang, Xishu ^{[2
]}

Xie, Xishan ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, Beijing 100083, Peoples R China

[2] Tsinghua Univ, Beijing 100084, Peoples R China

来源：

PROGRESSES IN FRACTURE AND STRENGTH OF MATERIALS AND STRUCTURES, 1-4 | 2007年 / 353-358卷

关键词：

inclusion; crack initiation; crack propagation; ultra-high strength steel;

D O I：

10.4028/www.scientific.net/KEM.353-358.1185

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Specially designed SEM in-situ tensile and fatigue tests have been conducted to trace the entire process of crack initiation and propagation till fracture in an ultra-high strength steel MA250. TiN is a typical inclusion and its average size is in the range of 8 similar to 10 mu m in MA250 steel. The micro-mechanism of the effect of TiN inclusion on crack initiation and propagation at tensile and fatigue tests both have been studied in detail. Experimental results show the harmful effect of TiN on tensile and fatigue properties both. This work is helpful to establish the practical life prediction model for the characteristic inclusion parameters in ultra-high strength steel components. It also enlightens us to eliminate TiN in the further development of ultra-high strength steels.

引用

页码：1185 / +

页数：2

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