Computational simulation of the dependence of the austenitic grain size on the deformation behavior of TRIP steels

Iwamoto, Takeshi; Tsuta, Toshio

doi:10.1016/s0749-6419(99)00079-0

Cited by 105 publications

(55 citation statements)

References 16 publications

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Section: Introductionmentioning

confidence: 69%

“…The grain size was found to have a strong effect on the transformation behavior of austenitic grains, and two contradictory conclusions could be found on this grain size effect in the previous research (Somani et al, 2009;Huang et al, 2011;Iwamoto and Tsuta, 2000;Shi et al, 2010b). Somani et al (2009) and Huang et al (2011) reported that martensite transformation could be enhanced significantly by ultra-fined austenite grains in 301LN stainless steel, which was contrary to the common observations that smaller austenite grains are more stable against transformation (Iwamoto and Tsuta, 2000;Shi et al, 2010b). Other factors, such as strain rate, temperature and stress triaxiality, were also found to have strong influences on TRIP effect: (i) at the low strain rate range (<1/s), TRIP effect happens at earlier strain for higher strain rate, while the maximum volume fraction of martensite decreases with increasing strain rate (Das and Tarafder, 2009;Lee et al, 2014;Prüger et al, 2014;Zaera et al, 2014); (ii) TRIP effect is suppressed with increasing temperature at the low temperature range (77-332 K) (Prüger et al, 2014;Zaera et al, 2014;Lebedev and Kosarchuk, 2000); (iii) increasing stress triaxiality intensifies TRIP effect (Lebedev and Kosarchuk, 2000;Jacques et al, 2007).…”

Section: Introductionmentioning

confidence: 88%

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Dynamic shear response and evolution mechanisms of adiabatic shear band in an ultrafine-grained austenite–ferrite duplex steel

Yuan

Bian

Jiang

et al. 2015

Mechanics of Materials

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a b s t r a c tThe dynamic properties of an intercritically annealed 0.2C5Mn steel with ultrafine-grained austenite-ferrite duplex structure were studied under dynamic shear loading. The formation and evolution mechanisms of adiabatic shear band in this steel were then investigated using interrupted experiments at five different shear displacements and the subsequent microstructure observations. The dynamic shear plastic deformation of the 0.2C5Mn steel was observed to have three stages: the strong linear hardening stage followed by the plateau stage, and then the strain softening stage associated with the evolution of adiabatic shear band. High impact shear toughness was found in this 0.2C5Mn steel, which is due to the following two aspects: the strong linear strain hardening by martensite transformation at the first stage, and the suppressing for the formation of shear band by the continuous deformation in different phases through the proper stress and strain partitioning at the plateau stage. The evolution of adiabatic shear band was found to be a two-stage process, namely an initiation stage followed by a thickening stage. The shear band consists of two regions at the thickening stage: a core region and two transition layers. When the adjoining matrix is localized into the transition layers, the grains are refined along with increasing fraction of austenite phase by inverse transformation. However, when the transition layers are transformed into the core region, the fraction of austenite phase is decreased and almost disappeared due to martensite transformation again. These interesting observations in the core region and the transition layers should be attributed to the competitions of the microstructure evolutions associated with the non-uniformly distributed shear deformation and the inhomogeneous adiabatic temperature rise in the different region of shear band. The 0.2C5Mn TRIP steel reported here can be considered as an excellent candidate for energy absorbers in the automotive industry.

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Section: Introductionmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 88%

Dynamic shear response and evolution mechanisms of adiabatic shear band in an ultrafine-grained austenite–ferrite duplex steel

Yuan

Bian

Jiang

et al. 2015

Mechanics of Materials

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“…A natureza da interação dos micromecanismos de deformação plástica, na estrutura metaestável dos aços inoxidáveis austeníticos à baixa temperatura, é complexa e, na realidade, pode depender, também, de parâmetros não pesquisados nesse trabalho, como: tipo de carregamento, taxa de deformação, densidade inicial de discordâncias, energia de falha de empilhamento, textura, tamanho de grão [Nagy et alii, 2004], [Iwamoto, Tsuta, 2000].…”

Section: Discussionunclassified

Comportamento plástico do aço inoxidável austenítico em baixa temperatura

Antunes

2007

Rem: Rev. Esc. Minas

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ResumoEnsaios de tração uniaxiais foram empregados para deformar aços inoxidáveis austeníticos do tipo 304, em diferentes temperaturas abaixo da ambiente (de 77 K a 300 K). A relação entre a estabilidade da austenita e o encruamento, em função da temperatura de teste, é discutida quanto à transformação martensítica induzida por deformação e ao deslizamento de discordâncias na austenita. Em curvas tensão-deformação que assumem a equação de Ludwik σ = σ o + kε n , na qual σ é a tensão verdadeira e ε a elongação plástica verdadeira, um modo conveniente para analisar o encruamento é por meio do diagrama log dσ / dε versus log ε. O aspecto significativo é a variação da taxa de encruamento dσ / dε com a elongação plástica verdadeira nas diferentes temperaturas. As mudanças no comportamento do encruamento motivando até três estágios de deformação são associadas a diferentes processos microestruturais. A transformação martensítica pode ser considerada como um processo de deformação que compete com o processo usual de deslizamento. A investigação desses estágios, na região plás-tica, produz uma referência qualitativa de como diferentes fatores, tais como o grau de deformação, temperatura e composição química da austenita, afetam a transformação austenita-martensita. Palavras-chaves:

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“…Stringfellow et al [14] extended this model by including stress into the probability function. The model was further developed by Tanaka and Iwamoto [12,[15][16][17][18][19][20]. The amount of shear band formation is related to plastic strain by…”

Section: Strain Induced Martensite Formationmentioning

confidence: 99%

“…[15] and other studies by the same group used the flow stress relations given below. The model was extended to include effect of grain size on austenite hardening in [23].…”

Section: Mechanical Properties Of Two-phase Materialsmentioning

confidence: 99%

Models for Forming Simulations of Metastable Austenitic Stainless Steel

Lindgren¹

2004

AIP Conference Proceedings

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Abstract. Simulation of forming of metastable austenitic stainless steels requires evolution equations for martensite formation due to plastic straining as a part of the constitutive model. The material properties may then be estimated based on phase composition and the properties of the individual phases. This study is part of a work where different models for this phase transformation as well as the plastic deformation behavior of the material are evaluated.

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Computational simulation of the dependence of the austenitic grain size on the deformation behavior of TRIP steels

Cited by 105 publications

References 16 publications

Dynamic shear response and evolution mechanisms of adiabatic shear band in an ultrafine-grained austenite–ferrite duplex steel

Dynamic shear response and evolution mechanisms of adiabatic shear band in an ultrafine-grained austenite–ferrite duplex steel

Comportamento plástico do aço inoxidável austenítico em baixa temperatura

Models for Forming Simulations of Metastable Austenitic Stainless Steel

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