The role of microfractography in failure analysis of cold forging dies

被引：0
|
作者：
Ebara R. [1 ]
Takeda K. [1 ]
Iwamoto M. [1 ]
Fujimoto H. [1 ]
Ogura A. [2 ]
Hamaya S. [2 ]
机构：
[1] Dept. Mech. System Eng., Hiroshima Inst. Tech., Saeki-Ku, Hiroshima
[2] Nichidai Corporation, Shiotani, Tsuduki-Gun, Kyoto
来源：
Zairyo/Journal of the Society of Materials Science, Japan | 2011年 / 60卷 / 11期
关键词：
Cold forging die steels; Fatigue fracture surface; Fracture toughness; Stretched zone; Unstable fracture;
D O I：
10.2472/jsms.60.1009
中图分类号：
学科分类号：
摘要：
Microfractographic features in fracture surfaces for tensile, fatigue, impact, three point bending specimens of cold forging die steels with Rockwell C scale hardness number of 52 to 68 are presented. The emphasis is placed upon the stretched zone formation ahead of the fatigue crack and the relation between the stretched zone width and fracture toughness. Fatigue crack initiation behavior of plane and notched specimens are also characterized in low cycle up to giga-cycle ranges. A couple of microfractographic analyzed results for failed actual cold forging dies are exemplified. It can be concluded that qualitative and quantitative analysis by use of microfractograpy are possible for cold forging die failures. © 2011 The Society of Materials Science, Japan.
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收藏
页码：1009 / 1014
页数：5
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