Subsurface Fatigue Crack Generation and Strain Incompatibility Near Grain Boundaries for a Nitrogen-strengthened Austenitic Steel at Cryogenic Temperatures
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概要
- 論文の詳細を見る
Fatigue damage in nitrogen-strengthened austenitic steel that showed subsurface crack generation and intergranular cracking at cryogenic temperatures has been characterized using electron backscatter diffraction (EBSD) analysis. Strain gradients near grain boundaries and localized stress concentrations in grains were clearly detected. The strain gradient in the vicinity of a grain boundary accompanied a misorientation of a few degrees, and may result from co-planar dislocation arrays at the grain boundary. To reduce localized strain incompatibility at grain boundaries, fine-grained duplex microstructure was obtained through partial recrystallization. The treated material showed considerably improved high-cycle fatigue strength and more homogenous plastic deformation.
- 社団法人 日本鉄鋼協会の論文
- 2009-10-15
著者
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Umezawa Osamu
Department Of Mechanical Engineering And Materials Science Yokohama National University
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Umezawa Osamu
Department Of Materials Science And Engineering Faculty Of Engineering Yokohama National University
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- PREFACE
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