Effect of Aging on σ Phase Precipitation and Properties of 4A Duplex Stainless Steel

被引：0
|
作者：
Lu P. [1 ]
Wang A. [1 ]
Xie J. [2 ]
Wang W. [1 ]
机构：
[1] College of Materials Science and Engineering, Henan University of Science and Technology, Luoyang
[2] Collaborative Innovation Center of Nonferrous Metals of Henan Province, School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang
来源：
Wang, Aiqin (aiqin_wang888@163.com) | 1600年 / Cailiao Daobaoshe/ Materials Review卷 / 31期
关键词：
4A duplex stainless steel; Aging treatment; Property; σ; phase;
D O I：
10.11896/j.issn.1005-023X.2017.016.016
中图分类号：
学科分类号：
摘要：
The effect of aging treatment on precipitation behavior of σ phase of 4A duplex stainless steel after solution treatment was observed by OM, and the precipitation process of σ phase at 850℃ for different time was analyzed. In order to investigate the precipitation characteristics and the mechanisms of σ phase, the morphology of the sample by aging for 4 hours was analyzed by SEM, EDS and TEM. Finally, the mechanical properties and corrosion resistance of 4A duplex stainless steel were also studied. The results show that σ phase is rich in Cr, Mo but Ni-depleted, its crystal structure is tetragonal and it is formed by the decomposition of δ; σ phase precipitation increased first and then decreased with the increase of aging temperature, and it reaches a peak at 850℃. The σ phase precipitation is more, when the aging time is longer under the same temperature; σ phase causes higher hardness of the material, but generally declining tensile strength, impact toughness and corrosion resistance, among which the impact toughness is particularly sensitive to the σ phase precipitation. © 2017, Materials Review Magazine. All right reserved.
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页码：76 / 80
页数：4
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