SEGREGATION AND STRENGTH OF GRAIN-BOUNDARIES

被引:70
作者
SEAH, MP [1 ]
机构
[1] NATL PHYS LAB,DIV CHEM STANDARDS,TEDDINGTON TW11 OLW,MIDDLESEX,ENGLAND
来源
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES | 1976年 / 349卷 / 1659期
关键词
METALS AND ALLOYS - Embrittlement;
D O I
10.1098/rspa.1976.0088
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
A quantitative theory is presented which explains how solute segregation alters grain boundary strength. A simple treatment shows that, because of an incorrect assumption, previous theories in which segregation was thought to cause low temperature brittleness by lowering the grain boundary work of fracture are incorrect and that it is the brittle fracture stress that is altered. The decrease in grain boundary brittle fracture stress is shown to be proportional to the level of segregation and also to the excess size of the segregant atoms over those of the matrix. An evaluation for the temper brittle steel, AISI 3340, gives a good numerical correlation with the published transition temperature shifts for the segregation of P, Sn, Sb, As, Si, Ge and Bi.
引用
收藏
页码:535 / 554
页数:20
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