Grain boundary strengthening in austenitic nitrogen steels

被引：86

作者：

Gavriljuk, VG

Berns, H

Escher, C

Glavatskaya, NI

Sozinov, A

Petrov, YN

机构：

[1] Kiev Met Phys Inst, UA-252142 Kiev, Ukraine

[2] Ruhr Univ Bochum, D-44780 Bochum, Germany

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1999年 / 271卷 / 1-2期

关键词：

Hall-Petch equation; planar slip; work hardening; grain-boundary segregation; dislocation-interstitials interaction;

D O I：

10.1016/S0921-5093(99)00272-5

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The effect of nitrogen and carbon on the strengthening of the austenitic steel Cr18Ni16Mn10 by grain boundaries is studied. It is established in accordance with previous results that, in contrast to carbon, nitrogen markedly increases the coefficient k in the Hall-Fetch equation. Because of a pronounced planar slip induced by nitrogen and the absence of ally noticeable segregation of nitrogen atoms at the grain boundaries, nitrogen austenite presents an excellent object for testing different existing models of grain boundary strengthening (pile-up of dislocations, grain boundary dislocation sources, work hardening). Based on the analysis of available data and measurements of interaction between nitrogen or carbon atoms and dislocations it is shown that the nitrogen effect can be attributed to a strong blocking of dislocation sources in grains adjacent to those where the slip started. (C) 1999 Elsevier Science S.A. All rights reserved.

引用

页码：14 / 21

页数：8

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