Interface segregation behavior in thermal aged austenitic precipitation strengthened stainless steel

被引:7
作者
Li, Hui [1 ,3 ]
Song, Hui [1 ]
Liu, Wenqing [1 ,2 ]
Xia, Shuang [2 ]
Zhou, Bangxin [2 ]
Su, Cheng [3 ]
Ding, Wenyan [3 ]
机构
[1] Shanghai Univ, Key Lab Microstruct, Shanghai 200444, Peoples R China
[2] Shanghai Univ, Inst Mat, Shanghai 200072, Peoples R China
[3] Jiuli Hitech Met Co Ltd, Tech Dept, Huzhou 313008, Peoples R China
基金
中国博士后科学基金; 中国国家自然科学基金;
关键词
Segregation; Precipitation; Grain boundary; Phase interface; Stainless steel; Atom probe tomography; GRAIN-BOUNDARY SEGREGATION; HYDROGEN PERFORMANCE; ATOMIC-SCALE; MECHANICAL-PROPERTIES; CARBIDE NUCLEATION; MICROSTRUCTURE; EVOLUTION; BORON;
D O I
10.1016/j.ultramic.2015.06.001
中图分类号
TH742 [显微镜];
学科分类号
摘要
The segregation of various elements at grain boundaries, precipitate/matrix interfaces were analyzed using atom probe tomography in an austenitic precipitation strengthened stainless steel aged at 750 degrees C for different time. Segregation of P, B and C at all types of interfaces in all the specimens were observed. However, Si segregated at all types of interfaces only in the specimen aged for 16 h. Enrichment of Ti at grain boundaries was evident in the specimen aged for 16 h, while Ti did not segregate at other interfaces. Mo varied considerably among interface types, e.g. from segregated at grain boundaries in the specimens after all the aging time to never segregate at gamma'/gamma phase interfaces. Cr co-segregated with C at grain boundaries, although carbides still did not nucleate at grain boundaries yet. Despite segregation tendency variations in different interface types, the segregation tendency evolution variation of different elements depending aging time were analyzed among all types of interfaces. Based on the experimental results, the enrichment factors, Gibbs interface excess and segregation free energies of segregated elements were calculated and discussed. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:255 / 264
页数:10
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