High-pressure torsion assisted segregation and precipitation in a Fe-18Cr-8Ni austenitic stainless steel

被引：14
|
作者：
Hoffman, Andrew [1 ]
Wen, Haiming [1 ,2 ]
Islamgaliev, Rinat [3 ]
Valiev, Ruslan [3 ]
机构：
[1] Missouri Univ Sci & Technol, Dept Min & Nucl Engn, Rolla, MO 65409 USA
[2] Missouri Univ Sci & Technol, Dept Mat Sci & Engn, Rolla, MO 65409 USA
[3] Ufa State Aviat Tech Univ, Inst Phys Adv Mat, Ufa 450008, Russia
来源：
MATERIALS LETTERS | 2019年 / 243卷
关键词：
Nanocrystalline materials; Segregation; Atom probe tomography; Severe plastic deformation; Diffusion; High pressure torsion; RADIATION-INDUCED SEGREGATION; DIFFUSION;
D O I：
10.1016/j.matlet.2019.02.030
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
During irradiation or high-temperature aging, stainless steel can develop precipitates, significantly affecting mechanical properties. In this study atom probe tomography (APT) was used to study grain boundary segregation and secondary phases in a purely austenitic SS304 (a Fe-18Cr-8Ni steel) processed by high-pressure torsion (HPT) at 300 degrees C. Ni, Mn, Si enriched phase was observed at grain boundaries, and Cu nanoprecipitates were observed along and near phase/grain boundaries. Precipitation is facilitated by deformation assisted segregation along grain boundaries with a mechanism similar to vacancy diffusion in irradiated steels. (C) 2019 Elsevier B.V. All rights reserved.
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页码：116 / 119
页数：4
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