Influence of heat treatments on the intergranular corrosion resistance of the AISI 347 cast and weld metal for high temperature services

被引：35

作者：

Kina, A. Yae ^{[1
]}

Souza, V. M. ^{[1
]}

Tavares, S. S. M. ^{[1
]}

Souza, J. A. ^{[1
]}

de Abreu, H. F. G. ^{[2
]}

机构：

[1] Univ Fed Fluminense, Dept Engn Mech, PGMEC, BR-24210 Niteroi, RJ, Brazil

[2] Univ Fed Ceara, Dept Met & Mat Engn, Fortaleza, Ceara, Brazil

来源：

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY | 2008年 / 199卷 / 1-3期

关键词：

austenitic stainless steel; stabilization; sensitization;

D O I：

10.1016/j.jmatprotec.2007.08.011

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Stabilized austenitic stainless steels such as AISI 347 can be selected to high temperature services due to the high creep resistance of austenite phase. Niobium is added to form fine NbC carbides, which increase the creep resistance and prevents intergranular corrosion. AISI 347 wires and electrodes are frequently used as feed metal to weld AISI 321 and 347 whrought plates. In the present work, we studied the intergranular corrosion resistance of cast structures of AISI 347 steel using electrochemical potentiodynamic reactivation tests. The study applies to cast and weld metal structures subjected to high temperature usage. The solution and stabilization treatments were evaluated. It was found that the solution treatment at 1100 degrees C followed by stabilization in the NbC precipitation range of temperature is of fundamental importance to avoid sensitization. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：391 / 395

页数：5

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