The effect of Nb on grain boundary segregation of B in high refractory Ni-based superalloys

被引：23

作者：

Antonov, Stoichko ^{[1
]}

Huo, Jiajie ^{[2
]}

Feng, Qiang ^{[2
]}

Isheim, Dieter ^{[3
,4
]}

Seidman, David N. ^{[3
,4
]}

Helmink, Randolph C. ^{[5
]}

Sun, Eugene ^{[5
]}

Tin, Sammy ^{[1
]}

机构：

[1] IIT, 10 W 32nd St, Chicago, IL 60616 USA

[2] Univ Sci & Technol Beijing, State Key Lab Adv Metals & Mat, Beijing 100083, Peoples R China

[3] Northwestern Univ, Dept Mat Sci & Engn, 2220 Campus Dr, Evanston, IL 60208 USA

[4] NUCAPT, 2220 Campus Dr, Evanston, IL 60208 USA

[5] Rolls Royce Corp, POB 420, Indianapolis, IN 46241 USA

来源：

SCRIPTA MATERIALIA | 2017年 / 138卷

基金：

美国国家科学基金会;

关键词：

Superalloy; Atom probe tomography; Grain boundaries; Precipitation; ATOM-PROBE TOMOGRAPHY; POLYCRYSTALLINE SUPERALLOY; BORON; MICROSTRUCTURE; PRECIPITATION; PHASE; SIGMA;

D O I：

10.1016/j.scriptamat.2017.05.028

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Atom probe tomography was used to quantitatively assess grain boundary phase compositions and determine local segregation along the grain boundary before and after a 1000 h thermal exposure at 800 degrees C on an experimental powder processed Ni-base superalloy containing elevated levels of Nb. Due to high levels of refractory alloying elements at the grain boundary, a complex network of a phase precipitates formed and the interfacial segregation profiles were studied. Although elemental B segregates to grain boundaries and secondary phase interfaces, insufficient levels are present to result in boride formation due to an enhanced solubility of B in the matrix phase. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：35 / 38

页数：4

共 25 条

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