Effect of R-phase on impact toughness of 25Cr-7Ni-4Mo super duplex stainless steel

被引：0
作者：
T. H. Hwang
J. H. Kim
K. H. Kim
W. J. Moon
C. Y. Kang
机构：
[1] Pukyong National University,Department of Metallurgical Engineering
[2] Japan Atomic Energy Agency,Fusion Research and Development Directorate
[3] Korea Basic Science Institute,undefined
来源：
Metals and Materials International | 2014年 / 20卷
关键词：
aging; materials; toughness; electron backscattering diffraction; precipitate;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Effect of R-phase at an initial stage of aging on impact toughness was investigated in this study. Microstructure observation and energy dispersive x-ray analysis obviously clarified that the R-phase was mainly precipitated at interface of ferrite and austenite phases and inside of the ferrite phase at the initial stage of aging, and it was transformed into σ-phase with an increase of aging time. The ferrite phase was decomposed into new γ2-phase and σ-phase by aging treatment. These variations of phase during the aging affected the mechanical property. In other words, the impact toughness value rapidly decreased with an increase of the R-phase at the initial stage of aging while it sharply decreased and then slowly decreased with an increase of the σ-phase. This decrease of the toughness at the initial stage of aging was predominantly due to the precipitation of R-phase.
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页码：13 / 17
页数：4
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