Influence of deep rolling on the a'-martensite formation in the subsurface, geometrically necessary dislocations and corrosion resistance of austenitic stainless steel AISI 304

被引:0
|
作者
de Oliveira, Diogo Azevedo [1 ,2 ]
Brito, Pedro Paiva [2 ]
Magalhaes, Frederico de Castro [3 ]
Cangussu, Vinicius Melo [3 ]
Azzi, Patricia Canazart [4 ]
Ardisson, Jose Domingos [5 ]
Rocha, Alexandre da Silva [5 ]
Abrao, Alexandre Mendes [2 ]
机构
[1] Ctr Fed Educ Tecnol Celso Suckow Fonseca CEFET RJ, Av Maracana,229 Campus Maracana, BR-20271110 Rio De Janeiro, RJ, Brazil
[2] Pontificia Univ Catolica Minas Gerais, Grad Program Mech Engn, Av Dom Jose Gaspar 500,Campus Coracao Eucarist, BR-30535901 Belo Horizonte, MG, Brazil
[3] Univ Fed Minas Gerais, Grad Program Mech Engn, Antonio Carlos 6627 Campus Pampulha, BR-31270901 Belo Horizonte, MG, Brazil
[4] Nucl Technol Dev Ctr CDTN, Rua Mario Werneck 6627, BR-31270901 Belo Horizonte, MG, Brazil
[5] Univ Fed Rio Grande do Sul, Grad Program Mech Engn, Rua Sarmento Leite 425, BR-90046902 Porto Alegre, RS, Brazil
来源
SURFACE & COATINGS TECHNOLOGY | 2024年 / 487卷
关键词
Austenitic stainless steel; Deep rolling; a'-martensite; Geometrically necessary dislocations; Corrosion; SURFACE-ROUGHNESS; RESIDUAL-STRESS; PHASE-TRANSFORMATION; FATIGUE BEHAVIOR; STRAIN-RATE; BALL; DEFORMATION; TEMPERATURE; IMPROVEMENT; PARAMETERS;
D O I
10.1016/j.surfcoat.2024.131011
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The influence of deep rolling (DR) parameters (speed, number of passes and pressure) on the equivalent total strain, a'-martensite formation, ultra-microhardness, microstructure, and corrosion resistance of an AISI 304 austenitic stainless steel was investigated. The results showed that increasing DR speed led to less heterogeneous strain distributions and relatively high ultra-microhardness, despite an overall reduction in strain and a'-martensite content. This increase in hardness was related to the rise of geometrically necessary dislocations (GNDs) density, found to be one of the primary microstructural features influencing mechanical behavior under high DR speed. The increase in the number of passes elevated the intensity and depth of strain, leading to a 70% increase in the content of a'-martensite, ultra-microhardness, and producing severe grain refinement. The GNDs density decreased in the refined grain layer and increased sharply below it. Increased pressure induced similar results relative to the number of passes, with less impact. Improvement in the material properties is achieved through the interaction of parameters that result in an increase in the severity of the DR process, i.e, a reduction in speed and an increase in the number of passes and pressure. For severe DR conditions, the materials corrosion resistance in a 3.5% NaCl aqueous solution was significantly improved, with an increase of up to 2488% in the polarization resistance, as assesssed by electrochemical impedance spectroscopy. In potentiodynamic polarization tests, the corrosion potential increased from an average value of -0.274 to -0.14 V, and the corrosion current density decreased by approximately 300%.
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页数:22
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