Sensitization of an austenitic stainless steel due to the occurrence of δ-ferrite
Source abstract
Abstract
Abstract 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°C. The DOS was detected by electrochemical potentiokinetic tests. Examination by scanning electron microscopy of etched samples revealed the presence of δ-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/δ-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°C showed precipitation of chromium carbides at grain boundaries and at the austenite/δ-ferrite interface; this treatment increased the DOS.
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Research context
OpenAlex topics: Hydrogen embrittlement and corrosion behaviors in metals · Microstructure and Mechanical Properties of Steels · Welding Techniques and Residual Stresses
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Instituto Nacional de Investigaciones Nucleares, Carr. México Toluca-La Marquesa s/n , 52750 Ocoyoacac , Mexico
Universidad Mexiquense del Bicentenario, Carr. Toluca – México 389, San Miguel , 52740 Ocoyoacac , Mexico
Universidad Autónoma de Nuevo León, Pedro de Alba s/n , 66455 San Nicolás de los Garza , Mexico
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