Deformation induced martensite in an AISI 301LN stainless steel: characterization and influence on pitting corrosion resistance

Abreu, Hamilton Ferreira Gomes de; Carvalho, Sheyla Santana de; Neto, Pedro de Lima; Santos, Ricardo; Freire, V. N.; Silva, P. M. O.; Tavares, Sérgio Souto Maior

doi:10.1590/s1516-14392007000400007

Cited by 95 publications

(32 citation statements)

References 13 publications

(17 reference statements)

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“…Este equipamento é utilizado para avaliar as propriedades magnéticas dos materiais, como magnetização e permeabilidade magnética [4]. Para realização do teste, a amostra é fixada em uma haste que está presa a uma cabeça vibratória e faz a amostra vibrar a uma frequência fixa.…”

Section: Magnetômetro De Amostra Vibrante (Vsm)unclassified

“…No papel de fase endurecedora, a martensita promove o aumento da resistência mecânica como desejado, porém, dependendo da quantidade presente, o material pode experimentar uma queda significativa na tenacidade, sendo em alguns casos um problema. Alguns pesquisadores observaram através da difração de raios X que a transformação martensítica ocasionada pelo trabalho a frio gera tanto martensita ε, HC e paramagnética, quanto martensita α', CCC e ferromagnética, sendo esta última a forma presente em deformações acima de 10% [4]. Assim, torna-se viável a aplicação de técnicas que explorem as propriedades magnéticas das fases para caracterização do material e seu grau de deformação.…”

Section: Introductionunclassified

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Caracterização Magneto-Óptica De Aço Inoxidável Austenítico Deformado a Frio

Silva¹,

Silva²,

Pacheco³

et al. 2017

Anais Do Enemet - Encontro Nacional De Estudantes De Engenharia Metalúrgica, De Materiais E De Minas

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ResumoOs aços inoxidáveis são materiais utilizados em ramos da indústria que demandam além de boa resistência à corrosão, elevada resistência mecânica. As ligas inoxidáveis austeníticas geralmente são submetidas ao trabalho a frio visando seu endurecimento, uma vez que não são endurecíveis via tratamento térmico. Devido à deformação plástica, pode ocorrer a transformação da austenita em martensita para algumas classes de aços. Esta transformação, dependendo da fração de fase transformada pode levar à redução da tenacidade. O foco deste trabalho está, portanto, na identificação e quantificação da martensita em amostras deformadas. Para isto, corpos de prova de aço austenítico AISI 321 foram deformados mediante laminação a frio e caracterizados pelo magnetômetro de amostra vibrante (VSM) e pela técnica Bitter modificada ao ferrofluido. Os resultados exibiram a fácil formação de martensita no aço e uma abordagem muito eficaz para revelar esta fase nas imagens de microscopia ótica. Com os valores de saturação magnética provenientes do VSM foi possível estimar a fração volumétrica da martensita para cada condição de deformação. Palavras-chave: Aços inoxidáveis; Ferrofluido; Laminação; Transformação martensítica. MAGNETO-OPTIC CHARACTERIZATION FOR AUSTENITIC STAINLESS STEEL AFTER COLD WORK AbstractStainless steels are materials used in many industry sectors that require good corrosion resistance as well as high mechanical strength. The austenitic stainless steels usually are submitted to cold working steps, in order to harden the material, since they are not hardened by heat treatment. Because of the plastic deformation, it may occur microestructural transformations from austenite to martensite in some classes of steels. Such transformations can lead to loss of thoughness depending on the fraction of the transformed phase. The purpose of this study relies on the identification and quantification of the martensite present in deformed samples. To make it possible, some samples of an austenitic steel AISI 321 were deformed through cold rolling and characterized by the Vibrating Sample Magnetometer (VSM) and the Bitter ferrofluid modified technique. The results exhibited an easy formation of martensite in the steel and an effective approach to reveal that phase in the optical microscopy. With the magnetic saturation values obtained from the VSM it was possible to estimate the volumetric fraction of martensite for each deformation condition.

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Section: Magnetômetro De Amostra Vibrante (Vsm)unclassified

Section: Introductionunclassified

Caracterização Magneto-Óptica De Aço Inoxidável Austenítico Deformado a Frio

Silva¹,

Silva²,

Pacheco³

et al. 2017

Anais Do Enemet - Encontro Nacional De Estudantes De Engenharia Metalúrgica, De Materiais E De Minas

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“…Moreover, the degree of martensitic transformation is both temperature and strain dependent [12][13][14][15][16][17][18][19]. An increase in the degree of cold work will assist the transformation, whereas an increase in the temperature exhibits the opposite effect [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Correlation between Fatigue Crack Growth Behavior and Fracture Surface Roughness on Cold-Rolled Austenitic Stainless Steels in Gaseous Hydrogen

Chen

Tsay

et al. 2018

Metals

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Austenitic stainless steels are often considered candidate materials for use in hydrogencontaining environments because of their low hydrogen embrittlement susceptibility. In this study, the fatigue crack growth behavior of the solution-annealed and cold-rolled 301, 304L, and 310S austenitic stainless steels was characterized in 0.2 MPa gaseous hydrogen to evaluate the hydrogenassisted fatigue crack growth and correlate the fatigue crack growth rates with the fracture feature or fracture surface roughness. Regardless of the testing conditions, higher fracture surface roughness could be obtained in a higher stress intensity factor (∆K) range and for the counterpart cold-rolled specimen in hydrogen. The accelerated fatigue crack growth of 301 and 304L in hydrogen was accompanied by high fracture surface roughness and was associated with strain-induced martensitic transformation in the plastic zone ahead of the fatigue crack tip.

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“…Numbers of researcher have carried on the extensive studied on the relationship between DIMT and chemical compositions, suggesting their own kinetics equations for describing DIMT [1][2][3][4][5][6][7][8][9]. Although considerable knowledge base is available for austenitic stainless steel in general, the understanding developed for 301 stainless steel system with nitrogen effect is still lack [1,23]. Investigations are therefore necessary for better understanding on the topic.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nitrogen on Deformation-Induced Martensitic Transformation in an Austenitic 301 Stainless Steels

Jeon

Chang

2017

Metals

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Abstract:The effect of nitrogen on deformation-induced martensitic transformation (DIMT) in metastable 301 austenitic stainless steel has been studied based on the inelastic deformation theory. DIMT is regarded here as continuous relaxation process of internal strain energy accumulated during inelastic deformation. Using the kinetics equation based on the inelastic deformation theory the relationship between the volume fraction of transformed martensite and inelastic strain for DIMT has been successfully verified with the parameter representing the stability of austenite. The addition of nitrogen is experimentally found to increase austenite stability and the critical inelastic strain below which any DIMT is not observed to occur and to decrease the saturation volume fraction of α' martensite. On the other hand, DIMT has been analyzed with its effect on stress-strain curve shape and mechanical properties in relation to the addition of nitrogen. The characteristic transition from sigmoidal to parabolic curve shape in stress-strain response has disappeared with the addition of nitrogen.

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Deformation induced martensite in an AISI 301LN stainless steel: characterization and influence on pitting corrosion resistance

Cited by 95 publications

References 13 publications

Caracterização Magneto-Óptica De Aço Inoxidável Austenítico Deformado a Frio

Caracterização Magneto-Óptica De Aço Inoxidável Austenítico Deformado a Frio

Correlation between Fatigue Crack Growth Behavior and Fracture Surface Roughness on Cold-Rolled Austenitic Stainless Steels in Gaseous Hydrogen

Effect of Nitrogen on Deformation-Induced Martensitic Transformation in an Austenitic 301 Stainless Steels

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