Influence of Ti, C and N concentration on the intergranular corrosion behaviour of AISI 316Ti and 321 stainless steels

被引：209

作者：

Pardo, A. ^{[1
]}

Merino, M. C. ^{[1
]}

Coy, A. E. ^{[1
]}

Viejo, F. ^{[1
]}

Carboneras, M. ^{[1
]}

Arrabal, R. ^{[1
]}

机构：

[1] Univ Complutense Madrid, Fac Ciencias Quim, Dept Ciencias Mat, E-28040 Madrid, Spain

来源：

ACTA MATERIALIA | 2007年 / 55卷 / 07期

关键词：

austenitic steels; corrosion; electrochemical potentiokinetic reactivation;

D O I：

10.1016/j.actamat.2006.11.021

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Intergranular corrosion behaviour of 316Ti and 321 austenitic stainless steels has been evaluated in relation to the influence exerted by modification of Ti, C and N concentrations. For this evaluation, electrochemical measurements - double loop electrochemical potentiokinetic reactivation (DL-EPR) - were performed to produce time-temperature-sensitization (TTS) diagrams for tested materials. Transmission (TEM) and scanning electron microscopy (SEM) were used to determine the composition and nature of precipitates. The addition of Ti promotes better intergranular corrosion resistance in stainless steels. The precipitation of titanium carbides reduces the formation of chromium-rich carbides, which occurs at lower concentrations. Also, the reduction of carbon content to below 0.03 wt.% improves sensitization resistance more than does Ti content. The presence of Mo in AISI 316Ti stainless steel reduces chromium-rich carbide precipitation; the reason is that Mo increases the stability of titanium carbides and tends to replace chromium in the formation of carbides and intermetallic compounds, thus reducing the risks of chromium-depletion. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：2239 / 2251

页数：13

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