Sensitization of an austenitic stainless steel due to the occurrence of δ-ferrite

被引：6

作者：

Arganis-Juarez, Carlos R. ^{[2
]}

Vazquez, Audi ^{[2
,3
]}

Garza-Montes-de-Oca, Nelson F. ^{[1
]}

Colas, Rafael ^{[1
]}

机构：

[1] Univ Autonoma Nuevo Leon, Pedro Alba S-N, San Nicolas De Los Garza 66455, Mexico

[2] Inst Nacl Invest Nucl, Carr Mexico Toluca La Marquesa S-N, Ocoyoacac 52750, Mexico

[3] Univ Mexiquense Bicentenario, Carr Toluca Mexico 389, San Miguel 52740, Ocoyoacac, Mexico

来源：

CORROSION REVIEWS | 2019年 / 37卷 / 02期

关键词：

aging; microscopy; sensitization; stainless steel; SIGMA-PHASE; DISSOLUTION; SOLIDIFICATION;

D O I：

10.1515/corrrev-2018-0036

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

A series of analyses were conducted on samples of an austenitic type 304 stainless steel that exhibited a high degree of sensitization (DOS) after being subjected to a solution annealing treatment at 1050 degrees C. The DOS was detected by electrochemical potentiokinetic tests. Examination by scanning electron microscopy of etched samples revealed the presence of delta-ferrite within the austenitic matrix, and of the segregation of chromium and nickel in either phase; images obtained by atomic force microscopy revealed localized attack at the austenite/delta-ferrite interface. It was found that the DOS and the ferrite number of the steel were reduced as the material was held at the solution temperature for longer times. Aging at 650 degrees C showed precipitation of chromium carbides at grain boundaries and at the austenite/6-ferrite interface; this treatment increased the DOS.

引用

页码：179 / 186

页数：8

共 16 条

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