Strain induced martensitic transformation of Fe–20Cr–5Mn–0.2Ni duplex stainless steel during cold rolling: Effects of nitrogen addition

Choi, Jae Yeon; Ji, Jung Hoon; Hwang, Sangwon; Park, Kyung‐Tae

doi:10.1016/j.msea.2011.04.038

Cited by 98 publications

(51 citation statements)

References 17 publications

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“…The fracture toughness, 3) precipitation of nitrides with heat treatment, 4) and improvement of mechanical properties using stressinduced martensitic transformation of the γ phase 5,6) have been reported for lean duplex stainless steels. Herrera et al 5) investigated duplex stainless steel with α and γ volume fractions of 37% and 63%, respectively, from a Fe-19.9Cr-0.42Ni-0.16N-4.79Mn-0.11C-0.46Cu-0.35Si steel.…”

Section: Introductionmentioning

confidence: 97%

Effects of Temperature and Strain Rate on Tensile Properties of a Lean Duplex Stainless Steel

et al. 2014

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Effects of temperature and strain rate on tensile properties in a lean duplex stainless steel S32101 were investigated. The 0.2% proof stress and tensile strength increase with a decrease in the temperature and an increase in the strain rate. The uniform elongation decreased with an increase in the strain rate. In the temperature dependence on uniform elongation, it increased from 273 K to 283 K and indicated the maximum uniform elongation at 258 K. This is closely associated with TRIP effect because austenite is transformed to stress-induced martensite at temperatures below 283 K from the x-ray diffraction experiments. The stress-induced transformation behavior at 258 K, at which the maximum uniform elongation was obtained, had things in common with the case of metastable austenitic stainless steels. When the tensile properties were compared between the S32101 and the metastable austenitic stainless steels, the increase in the uniform elongation due to TRIP effect was almost the same. At low temperatures below about 250 K, the uniform elongations of the metastable austenitic steels were smaller than that of the S32101 because of the large amount of stress-induced martensite at small strains.KEY WORDS: lean duplex stainless steels; temperature; strain rate; TRIP; metastable austenitic stainless steels.

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Section: Introductionmentioning

confidence: 97%

Effects of Temperature and Strain Rate on Tensile Properties of a Lean Duplex Stainless Steel

et al. 2014

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“…Sabe-se que o tamanho de grão de uma estrutura de aço inoxidável duplex recozida depende fortemente do grau de deformação prévio e menos da temperatura de recozimento [16]. Na Figura 3, estão evidenciados os diferentes tipos de ferrita destacados por Choi et al [17]: em (1) tem-se uma ferrita fina com morfologia acicular nas interfaces de maclas de recozimento da austenita e em (2), tem-se a ferrita formada a partir dessas maclas, na forma de grãos alongados no sentido da laminação. Esse tipo de nucleação ocorre pelo fato dessas regiões macladas serem regiões de alta energia, se tornando sítios propícios para a formação de ferrita a partir da austenita durante o recozimento.…”

Section: Análise Microestrutural Do Estado De Entregaunclassified

Influência Da Taxa De Deformação Sobre O Comportamento Mecânico Em Tração Do Aço Inoxidável Duplex Uns S32304

Silva¹,

Magalhães²,

Faria³

et al. 2017

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

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ResumoDiferentes mecanismos podem atuar e governar a deformação plástica de uma liga metálica. Estes mecanismos são fortemente dependentes de características como composição química, estrutura cristalina e energia de falha de empilhamento. Com o objetivo de se avaliar o comportamento do aço inoxidável duplex UNS S32304 quando submetido a esforços trativos e considerando a importância desta informação durante a conformação mecânica, este trabalho estudou a influência da taxa de deformação sobre as principais propriedades mecânicas medidas no ensaio de tração. Para a realização deste estudo, corpos de prova de tração foram usinados a partir de chapas do referido aço laminado a frio com espessura final de 2,5mm. Cada conjunto de 3 corpos de prova foi submetido às taxas de deformação de 7x10 -4 s -1 , 7x10 -3 s -1 e 4x10 -2 s -1 . Por meio da análise dos resultados, observou-se uma diminuição na ductilidade e um aumento no limite de escoamento com o aumento da taxa de deformação. Entretanto, o limite de resistência não variou de forma significativa nas diferentes taxas estudadas. Palavras-chave: Aço inoxidável duplex; Taxa de deformação; Comportamento mecânico. STRAIN RATE EFFECTS ON MECHANICAL BEHAVIOR IN TENSILE TEST OF UNS S32304 DUPLEX STAINLESS STEEL AbstractDifferent mechanisms can act and control plastic strain in a metallic alloy. These mechanisms are strongly dependent of properties such as chemical composition, crystal structure and stacking fault energy. Aiming to evaluate the mechanical behavior of the UNS S32304 duplex stainless steel when subjected to tensile test, considering this information essential for successful forming processes, this work studied the influence of strain rate on the tensile properties of this alloy. For this purpose, tensile test specimens were machined from UNS S32304 cold rolled plates with the thickness of 2.5mm and each group of 3 specimens was subjected to the strain rates: 7x10 -4 s -1 , 7x10 -3 s -1 e 4x10 -2 s -1 . A decrease in ductility and an increase on the yield strength were observed with increasing strain rate. The tensile strength, however, did not vary significantly for the studied strain rates.

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“…To achieve this goal, it is necessary to investigate in detail the plastic deformation behavior of duplex stainless steels, such as their mechanical properties and strength-elongation balance. 1,4) A number of studies involving neutron and synchrotron x-ray diffractions have been carried out to investigate the deformation behavior of various steels and alloys. [5][6][7][8] Neutron and synchrotron x-ray diffraction measurements, because of their high penetration abilities, can help ascertain bulk strains in engineering materials.…”

Section: Introductionmentioning

confidence: 99%

“…When applied stress is removed after tensile deformation, a tensile residual stress is observed in the hard phase, and a compressive residual stress is observed in the soft phase. 4,5) Plastic deformability can also be investigated by stress partitioning between the [hkl] family grains in each phase or between the constituent phases. 5,10,11) Because the crystal structures of the α phase and γ phase are different in duplex stainless steels, tensile deformation behavior can be discussed from the standpoints of stress partitioning not only between the γ and α phases but also among [hkl] family grains at the constituent phases.…”

Section: Introductionmentioning

confidence: 99%

“…5,10,11) Because the crystal structures of the α phase and γ phase are different in duplex stainless steels, tensile deformation behavior can be discussed from the standpoints of stress partitioning not only between the γ and α phases but also among [hkl] family grains at the constituent phases. 4,5) In this study, we performed static tensile tests and in situ neutron diffraction experiments during tensile deformation as well as synchrotron radiation white x-ray diffraction experiments on a lean duplex stainless steel. The static tensile properties and work hardening behavior of the steel were discussed from the viewpoints of inhomogeneous plastic deformation between the α phase and γ phase or among [hkl]-oriented family grains based on the experimental results.…”

Section: Introductionmentioning

confidence: 99%

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Static Tensile Deformation Behavior of a Lean Duplex Stainless Steel Studied by In Situ Neutron Diffraction and Synchrotron Radiation White X-rays

et al. 2013

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To investigate the tensile deformation behavior of a lean duplex stainless steel (S32101) from the viewpoints of plastic deformability among phases or grains, we performed static tensile tests, in situ neutron diffraction, and white x-ray diffraction experiments at room temperature. In the static tensile tests, the S32101 steel displayed a larger uniform elongation and a better tensile strength-uniform elongation balance than a commercial SUS329J4L duplex stainless steel. A larger uniform elongation of S32101 is associated with the macroscopic work hardening behavior that a work hardening rate higher than the flow stress can maintain up until high true strains. From the experimental results of synchrotron radiation white x-ray diffraction experiments, the hard phase of S32101 was changed from the ferrite (α) phase to austenite (γ) one during tensile deformation. This led to a larger stress partitioning between the phases at the latter stage of deformation. From the experimental results of in situ neutron diffraction, it was found that the stress partitioning of the γ phase in the S32101 was the largest among the present results. Therefore, the larger work hardening rate of S32101 can be explained by the large stress partitioning of the γ phase, that between γ and α phases and γ volume fraction.

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Strain induced martensitic transformation of Fe–20Cr–5Mn–0.2Ni duplex stainless steel during cold rolling: Effects of nitrogen addition

Cited by 98 publications

References 17 publications

Effects of Temperature and Strain Rate on Tensile Properties of a Lean Duplex Stainless Steel

Effects of Temperature and Strain Rate on Tensile Properties of a Lean Duplex Stainless Steel

Influência Da Taxa De Deformação Sobre O Comportamento Mecânico Em Tração Do Aço Inoxidável Duplex Uns S32304

Static Tensile Deformation Behavior of a Lean Duplex Stainless Steel Studied by In Situ Neutron Diffraction and Synchrotron Radiation White X-rays

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