Transformation-induced plasticity (TRIP) effect is the outstanding mechanism of austenitic stainless steel. It plays an important role in increasing formability of the steel due to higher local strain hardening during deformation. In order to better understand forming behavior of this steel grade, the strain-induced martensitic transformation of the 304 stainless steel was investigated. Uniaxial tensile tests were performed at different temperatures for the steel up to varying strain levels. Stress–strain curves and work hardening rates with typical TRIP effect characteristics were obtained. Metallographic observations in combination with X-ray diffraction method were employed for determining microstructure evolution. Higher volume fraction of martensite was found by increasing deformation level and decreasing forming temperature. Subsequently, micromechanics models based on the Mecking–Kocks approach and Gladman-type mixture law were applied to predict amount of transformed martensite and overall flow stress curves. Hereby, individual constituents of the steel and their developments were taken into account. Additionally, finite element (FE) simulations of two representative volume element (RVE) models were conducted, in which effective stress–strain responses and local stress and strain distributions in the microstructures were described under consideration of the TRIP effect. It was found that flow stress curves calculated by the mixture law and RVE simulations fairly agreed with the experimental results. The RVE models with different morphologies of martensite provided similar effective stress–strain behavior, but unlike local stress and strain distributions, which could in turn affect the strain-induced martensitic transformation.
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July 2017
Research-Article
Prediction of Stress–Strain Curves of Metastable Austenitic Stainless Steel Considering Deformation-Induced Martensitic Transformation
T. Kumnorkaew,
T. Kumnorkaew
Department of Mechanical Engineering,
Faculty of Engineering,
Rajamangala University of Technology
Krungthep,
2 Nanglinji Road,
Tungmahamek, Sathorn,
Bangkok 10120, Thailand
Faculty of Engineering,
Rajamangala University of Technology
Krungthep,
2 Nanglinji Road,
Tungmahamek, Sathorn,
Bangkok 10120, Thailand
Search for other works by this author on:
V. Uthaisangsuk
V. Uthaisangsuk
Department of Mechanical Engineering,
Faculty of Engineering,
King Mongkut's University of
Technology Thonburi,
126 Pracha Uthit Road,
Bang Mod, Thung Khru,
Bangkok 10140, Thailand
e-mail: vitoon.uth@kmutt.ac.th
Faculty of Engineering,
King Mongkut's University of
Technology Thonburi,
126 Pracha Uthit Road,
Bang Mod, Thung Khru,
Bangkok 10140, Thailand
e-mail: vitoon.uth@kmutt.ac.th
Search for other works by this author on:
T. Kumnorkaew
Department of Mechanical Engineering,
Faculty of Engineering,
Rajamangala University of Technology
Krungthep,
2 Nanglinji Road,
Tungmahamek, Sathorn,
Bangkok 10120, Thailand
Faculty of Engineering,
Rajamangala University of Technology
Krungthep,
2 Nanglinji Road,
Tungmahamek, Sathorn,
Bangkok 10120, Thailand
V. Uthaisangsuk
Department of Mechanical Engineering,
Faculty of Engineering,
King Mongkut's University of
Technology Thonburi,
126 Pracha Uthit Road,
Bang Mod, Thung Khru,
Bangkok 10140, Thailand
e-mail: vitoon.uth@kmutt.ac.th
Faculty of Engineering,
King Mongkut's University of
Technology Thonburi,
126 Pracha Uthit Road,
Bang Mod, Thung Khru,
Bangkok 10140, Thailand
e-mail: vitoon.uth@kmutt.ac.th
1Corresponding author.
Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received April 26, 2016; final manuscript received November 22, 2016; published online March 23, 2017. Assoc. Editor: Antonios Kontsos.
J. Eng. Mater. Technol. Jul 2017, 139(3): 031002 (9 pages)
Published Online: March 23, 2017
Article history
Received:
April 26, 2016
Revised:
November 22, 2016
Citation
Kumnorkaew, T., and Uthaisangsuk, V. (March 23, 2017). "Prediction of Stress–Strain Curves of Metastable Austenitic Stainless Steel Considering Deformation-Induced Martensitic Transformation." ASME. J. Eng. Mater. Technol. July 2017; 139(3): 031002. https://doi.org/10.1115/1.4035623
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