Graphical representation for isothermal kinetics of non-equilibrium grain-boundary segregation

被引：17
作者：
Wang, Kai [1 ]
Xu, TingDong [1 ]
Song, ShenHua [2 ]
Shao, Chong [1 ]
机构：
[1] Cent Iron & Steel Res Inst, Superalloy Dept, 76 Xueyuan Nanlu, Beijing 100081, Peoples R China
[2] Harbin Inst Technol, Shenzhen Grad Sch, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China
来源：
MATERIALS CHARACTERIZATION | 2011年 / 62卷 / 06期
基金：
中国国家自然科学基金;
关键词：
Ni-base alloys; Grain boundaries; Non-equilibrium segregation; TENSILE PROPERTIES; CRITICAL TIME; EMBRITTLEMENT; PHOSPHORUS; SULFUR; ALLOYS; STEEL; MODEL;
D O I：
10.1016/j.matchar.2011.03.008
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A model of non-equilibrium grain-boundary segregation of solute is expressed with graphs for the isothermal aging at various temperatures after quenching from a solution temperature. It is found from the graphical representations that when the samples are aged for a certain time at various temperatures there is a maximum value in the segregation concentration at a certain temperature. The aging time is equal or close to the critical time of non-equilibrium segregation corresponding to this temperature. This finding is experimentally confirmed with sulfur in an Ni-base superalloy with the aid of Auger electron spectroscopy. As an application of the new finding, a mechanism for intermediate temperature embrittlement of alloys is suggested and identified experimentally with tension tests of the superalloy. Crown Copyright (C) 2011 Published by Elsevier Inc. All rights reserved.
引用
收藏
页码：575 / 581
页数：7
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