Effects of chemical composition, rolling and cooling conditions on the amount of martensite/austenite (M/A) constituent formation in low carbon bainitic steels

Wang, Shyi-Chin; Yang, Jer−Ren

doi:10.1016/0921-5093(92)90361-4

Cited by 53 publications

(13 citation statements)

References 8 publications

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“…Upon cooling the austenite will transform to hard MA regions [2]. Although MA has been widely studied in recent decades, the effect of cooling rate on its volume fraction remains ambiguous [2]; where some research has shown that increased cooling rate will increase fraction of MA [3,4], while other work suggests a decrease in MA with increase of cooling rate [5][6][7]. Gonzalez et al reported an increase in MA percentage with increased cooling rate for X80 pipe steel during heat treatment [8].…”

Section: Introductionmentioning

confidence: 99%

Influence of martensite-austenite (MA) on impact toughness of X80 line pipe steels

Huda

Midawi

Gianetto

et al. 2016

Materials Science and Engineering: A

109

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Section: Introductionmentioning

confidence: 99%

Influence of martensite-austenite (MA) on impact toughness of X80 line pipe steels

Huda

Midawi

Gianetto

et al. 2016

Materials Science and Engineering: A

109

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“…Subsequently, high densities of substructure and dislocation (deformation bands) are generated in the austenite when the rolling is conducted in the non-recrystallized austenite region [29]. During the following continuous cooling process, the deformed austenite transforms into ferrite continuously, and the retained austenite is further carbon-enriched and fully stabilized until the transformation becomes thermodynamically impossible [30]. Finally, part of the carbon-enriched retained austenite could transform to martensite and the retained austenite would coexist with the martensite, making the so-called M/A constituent [31].…”

Section: Effect Of Finish Rolling Temperature On Microstructure Evolumentioning

confidence: 99%

Effect of Finish Rolling Temperature on the Microstructure and Tensile Properties of Nb–Ti Microalloyed X90 Pipeline Steel

Guo

Fan

Wang

et al. 2016

Metals

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Abstract:The relationship between microstructure and tensile properties of an Nb-Ti microalloyed X90 pipeline steel was studied as a function of finish rolling temperature using a Gleeble 3500 simulator, an optical and scanning electron microscope, electron back scattered diffraction (EBSD), a transmission electron microscope (TEM) and X-ray diffraction. The results indicate that the microstructure is primarily composed of non-equiaxed ferrite with martensite/austenite (M/A) constituent dispersed at grain boundaries for the specimens with different finish rolling temperatures. With a decrease in the finish rolling temperature, the yield strength increases, following a significant increase in the grain refinement strengthening contribution and dislocation strengthening contribution, although the precipitation strengthening contribution decreases. The increasing yield ratio (YR) shows that the strain hardening capacity declines as a result of the microstructure evolution when decreasing the finish rolling temperature.

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“…Outro fato que corrobora com essa hipótese é a presença do constituinte MA (martensita-austenita) nas microestruturas simuladas com encharque a 780°C através do HDPS, conforme mostrado na figura 4. Isso se deve potencialmente a dois fatores: (1) formação de austenita no interior dos grãos de ferrita diante da elevada temperatura de encharque e (2) o teor de manganês reduzindo a atividade do carbono no interior da austenita, retardando as transformações martensítica e bainítica e promovendo a formação do constituinte MA [7,8]. As microestruturas obtidas a partir das simulações com encharque a 740°C via HDPS, possuem aspecto tipicamente bifásico, conforme a figura 4.…”

Section: Caracterização Microestruturalunclassified

EFEITO DOS PARÂMETROS DE RECOZIMENTO CONTÍNUO NA MICROESTRUTURA E PROPRIEDADES MECÂNICAS DE UM AÇO REVESTIDO POR IMERSÃO A QUENTE DA CLASSE DE RESISTÊNCIA DE 800 Mpa

Guimarães¹,

Cetlin²,

Rocha³

et al. 2017

Anais Do Seminário De Laminação E Conformação

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ResumoNeste trabalho avaliou-se o efeito de diferentes ciclos térmicos na microestrutura e propriedades mecânicas de um aço Dual Phase revestido por imersão a quente, da classe de resistência de 800 MPa, a partir de simulações em escala piloto no equipamento HDPS (Hot Dip Process Simulator), ensaios dilatométricos, tração à temperatura ambiente e flangeamento. Nas simulações de recozimento contínuo foram experimentadas duas temperaturas de encharque no recozimento intercrítico (740°C e 780°C) e três temperaturas de patamar isotérmico no resfriamento rápido (610°C, 560°C e 510°C). A caracterização microestrutural evidenciou que a temperatura de encharque de 740°C não foi suficiente para dissolução completa dos carbonetos formados na laminação a quente, resultando em frações reduzidas de segundo constituinte. Com isso, o limite de resistência mínimo de 800 MPa não foi alcançado. Além disso, os resultados de ductilidade e flangeamento se mostraram aquém dos obtidos nas simulações com encharque a 780°C. Nas simulações com temperatura de encharque a 780°C e isotérmicas de 510°C e 560°C no resfriamento rápido foi atendido o limite de resistência mínimo, com capacidade de expansão de furo ligeiramente superior à obtida nas simulações com encharque a 740°C. Palavras-chave: Aços avançados de alta resistência; Dual phase; Recozimento contínuo. EFFECT OF CONTINUOUS ANNEALING PARAMETERS ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF A HOT DIP GALVANIZED STEEL OF THE 800 MPa STRENGTH CLASS AbstractIn this work was evaluated the effect of different thermal cycles on the microstructures and mechanical properties of a hot dip galvanized Dual Phase steel, class 800 MPa, from simulations in laboratory scale with the equipment HDPS (Hot Dip Process Simulator), dilatometric test, tensile test and flanging test. In the continuous annealing simulations were tested two soaking temperature (740°C and 780°C) and three isothermal temperatures in the rapid cooling (610°C, 560°C and 510°C). Microstructural characterization showed that the soaking temperature at 740°C was not enough for the complete dissolution of carbides, resulting in lower fractions of the second constituent. Thus, the minimum tensile strength was not reached. Furthermore, the ductility and flanging were lower compared to soaking temperature at 780°C. In the thermal cycles at 780°C and isothermal temperature at 510°C and 560°C in the rapid cooling the minimum tensile strength was reached, hole expansion was slightly higher compared to soaking temperature at 740°C.

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Effects of chemical composition, rolling and cooling conditions on the amount of martensite/austenite (M/A) constituent formation in low carbon bainitic steels

Cited by 53 publications

References 8 publications

Influence of martensite-austenite (MA) on impact toughness of X80 line pipe steels

Influence of martensite-austenite (MA) on impact toughness of X80 line pipe steels

Effect of Finish Rolling Temperature on the Microstructure and Tensile Properties of Nb–Ti Microalloyed X90 Pipeline Steel

EFEITO DOS PARÂMETROS DE RECOZIMENTO CONTÍNUO NA MICROESTRUTURA E PROPRIEDADES MECÂNICAS DE UM AÇO REVESTIDO POR IMERSÃO A QUENTE DA CLASSE DE RESISTÊNCIA DE 800 Mpa

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