Characteristics of retained austenite in TRIP steels with bainitic ferrite matrix

Zhang, Mingya; Fang, Zhu; Duan, Zhengtao; Shi-cheng, MA

doi:10.1007/s11595-011-0379-x

Cited by 10 publications

(5 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…According to Zhang et al, austenite stabilization required a minimum carbon content of 1.0 wt%. [ 24 ] QT180 exhibits a high product of strength and elongation (PSE), achieving a TS of 1281 MPa and a TEL of 16.2%.…”

Section: Resultsmentioning

confidence: 99%

Effect of Quenching Temperature on the Strengthening Mechanism of Low‐Carbon Microalloyed Quenching and Partitioning Steel

Chu

Chen

Liu

et al. 2022

steel research int.

View full text Add to dashboard Cite

Herein, the microstructures of the low‐carbon microalloyed quenching and partitioning (Q–P) steels are multiphase with ferrite (F), martensite (M), and retained austenite (RA) at different quenching temperatures (QTs), i.e., 140, 180, 240, and 300 °C. The volume fraction of fresh martensite (FM) increases from 8.6% to 61.4%, but the tempered martensite (TM) decreases from 49.7% to 0% with the QT increase. Meanwhile, the size of the precipitates (Nb, Ti)C tends to increase, whereas the fraction of the precipitates decreases first and then increases. With the increase of the QT, the yield strength (YS) decreases, the tensile strength (TS) increases, and the elongation first increases and then decreases. Additionally, the strengthening mechanism of Q–P steel is quantitatively analyzed in terms of F, M, RA, and precipitation strengthening. This study shows that F makes the same contribution to YS for the tested steels. The major strengthening mechanism of the Q–P steel is contributed by M, which accounts for about 43.7% to 56.0% of total YS. RA greatly influences the plasticity of Q–P steel and provides little to YS. With an increase in QT, the precipitation strengthening values first decrease and then increase.

show abstract

Section: Resultsmentioning

confidence: 99%

Effect of Quenching Temperature on the Strengthening Mechanism of Low‐Carbon Microalloyed Quenching and Partitioning Steel

Chu

Chen

Liu

et al. 2022

steel research int.

View full text Add to dashboard Cite

show abstract

“…Por outro lado, uma excessiva estabilidade da austenita também poderia dimunir a capacidade do material em sofrer transformação martensítica induzida por deformação o que reduz o alongamento do material [12]. Alguns autores [13,14] Da Tabela 3 observa-se que o maior nível de absorção de energia poderia ser obtido para um material estampado a quente e o menor para um material sometido a processo de HSQP. No entanto os valores são muito próximos entre eles, e se destaca como a perda do limite de resistência, no tratramento HSQP, pode ser compensada por seu maior alongamento, o que permite obter valores de absorção de energia próximos aos demais tratamentos.…”

Section: Figuraunclassified

“…Os resultados obtidos dos ensaios mecânicos dos corpos tratados por Q, QP, HS e HSQP, apresentaram comportamentos diferentes, sendo que os resultados da amostra temperada (Q) apresentou os maiores níveis de resistência (88% de martensita e ~9% de ferrita) e, a amostra submetida ao processo combinado de estampagem a quente, seguida por têmpera e partição (HSQP) apresentou os maiores resultados de alongamento, 16,8% (~30% de ferrita e 7,4 de austenita retida). Os resultados da concentração em carbono na austenita para as amostras particionadas estiveram na faixa (entre 1,0 e 1,5%) do sugerido por alguns autores [13,14] para um melhor desempenho para o efeito TRIP.…”

Section: Conclusõesunclassified

Avaliação Das Propriedades Mecânicas Para Um Aço Trip Submetido Aos Processos De Têmpera E Partição E Estampagem a Quente

Echeverri¹,

Nishikawa²,

Goldenstein³

et al. 2018

ABM Proceedings

View full text Add to dashboard Cite

ResumoO aumento das exigências para reduzir o consumo de combustível e aumentar a segurança dos passageiros tem estimulado o desenvolvimento da nova geração de aços de alta resistência. Esses objetivos tornam-se atingíveis com a redução do peso dos componentes de aço do veiculo, pelo uso de chapas mais finas e resistentes, mas não menos dúcteis. Com esse propósito, no presente trabalho pretendeu-se analisar os efeitos de diferentes rotas de processamento: estampagem a quente, têmpera e partição e o inovador processo que combina a deformação a quente com a têmpera e partição. Os ciclos térmicos foram projetados para obter a maior fração de austenita retida, além de ferrita e martensita. Para cada amostra tratada, amostras de tração de tamanho reduzido foram extraídas de amostras previamente tratadas em simulador termomecânico avançado Gleeble 3S50. A microestrutura foi analisada por microscopia óptica e eletrônica de varredura. Com o novo processo combinado acredita-se que seja possível atingir uma boa associação de propriedades para a nova geração de aços de alta resistência pela transformação da austenita retida metaestável em martensita induzida por deformação, contribuindo para a absorção de energia durante impacto. Palavras-chave: Estampagem a Quente; Têmpera e Partição, aço TRIP. EVALUATION OF THE MECHANICAL PROPERTIES OF A TRIP-STEEL TREATED BY QUENCHING AND PARTITIONING AND HOT STAMPING PROCESSES AbstractIncreased requirements for low fuel consumption and improved safety in the automotive industry have stimulated the development of new generations of high strength steels. To reduce fuel consumption, weight reduction of the steel car body is required by using thinner and therefore stronger but not less ductile materials. With this purpose, the present work aims to analyze the effect of different processing routes: hot stamping, quenching and partitioning and a novel combined process of hot stamping and quenching and partitioning. The thermal cycles have been designed in order to obtain the maximum fraction of retained austenite combined with ferrite and martensite after the process. From each heat treated specimen, subsize tensile specimens were extracted from the samples previously treated in an advanced thermomechanical simulator Gleeble 3S50. The microstructure was analyzed by optical and SEM. The newly developed combined process is believed to be a promising heat treatment for the new generation of AHSS, given that metastable retained austenite is beneficial due to occurrence of TRIP phenomenon during deformation, contributing to impact energy absorption.

show abstract

“…Yao used SEM combined with deep learning based image processing to characterize the nanoscale pore structure of rock debris (Yao et al, 2022). Scholars have also used SEM to observe and analyze the microstructure of solid/oil well cement stone (Li et al, 2016;Zhang et al, 2013;Song et al, 2017;Song et al, 2020). Munawar used optical polarization microscopy in transmission mode to document the whole-rock mineralogy, diagenetic relationships, porosity characteristics and clay occurrences in the pores of these samples (Munawar et al, 2018a).…”

Section: Introductionmentioning

confidence: 99%

Research on micro/nano scale 3D reconstruction based on scanning electron microscope

Dong,

Jia,

Qin

et al. 2024

Front. Energy Res.

View full text Add to dashboard Cite

Scanning electron microscopy (SEM) has an important application in the petroleum field, which is often used to analyze the microstructure of reservoir rocks, etc. Most of these analyses are based on two-dimensional images. In fact, SEM can carry out micro-nano scale three-dimensional measurement, and three-dimensional models can provide more accurate information than two-dimensional images. Among the commonly used SEM 3D reconstruction methods, parallax depth mapping is the most commonly used method. Multiple SEM images can be obtained by continuously tilting the sample table at a certain Angle, and multiple point clouds can be generated according to the parallax depth mapping method, and a more complete point clouds recovery can be achieved by combining the point clouds registration. However, the root mean square error of the point clouds generated by this method is relatively large and unstable after participating in point clouds registration. Therefore, this paper proposes a new method for generating point clouds. Firstly, the sample stage is rotated by a certain angle to obtain two SEM images. This operation makes the rotation matrix a known quantity. Then, based on the imaging model, an equation system is constructed to estimate the unknown translation parameters, and finally, triangulation is used to obtain the point clouds. The method proposed in this paper was tested on a publicly available 3D SEM image set, and the results showed that compared to the disparity depth mapping method, the point clouds generated by our method showed a significant reduction in root mean square error and relative rotation error in point clouds registration.

show abstract

Characteristics of retained austenite in TRIP steels with bainitic ferrite matrix

Cited by 10 publications

References 16 publications

Effect of Quenching Temperature on the Strengthening Mechanism of Low‐Carbon Microalloyed Quenching and Partitioning Steel

Effect of Quenching Temperature on the Strengthening Mechanism of Low‐Carbon Microalloyed Quenching and Partitioning Steel

Avaliação Das Propriedades Mecânicas Para Um Aço Trip Submetido Aos Processos De Têmpera E Partição E Estampagem a Quente

Research on micro/nano scale 3D reconstruction based on scanning electron microscope

Contact Info

Product

Resources

About