Stages of fatigue fracture in nickel alloyed powder metallurgy steel

被引：5
作者：
Drar, H [1 ]
机构：
[1] Jonkoping Univ, Sch Engn, Dept Mech Engn, S-55111 Jonkoping, Sweden
来源：
MATERIALS SCIENCE AND TECHNOLOGY | 2001年 / 17卷 / 10期
关键词：
D O I：
10.1179/026708301101509179
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Fatigue fracture of smooth rectangular specimens was investigated by testing at constant amplitude and zero mean stress, at a frequency of 30 Hz. Two nickel alloyed powder metallurgy steels with different contents of pores and MnS were examined. Fatigue fracture started with crack nucleation at pore interfaces by the formation of small steps. Growth of these nuclei was accomplished by stepwise crack tip blunting, which led to the formation of macrocracks. A dominant fatigue crack origin built up at the region of the largest number of macrocracks. Fatigue crack growth stages I, II, and III were found in this region. (C) 2001 IoM Communications Ltd.
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页码：1259 / 1264
页数：6
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