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.
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页码：575 / 581
页数：7
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