The authors simulated the industrially used continuous annealing conditions to process dual phase (DP) steels by using a custom designed annealing simulator. Sixty-seven percentage of cold rolled steel sheets was subjected to different processing routes, including the conventional continuous annealing line (CAL), intercritical annealing (ICA), and thermal cycling (TC), to investigate the effect of change in volume fraction, shape, and spatial distribution of martensite on tensile deformation characteristics of DP steels. Annealing parameters were derived using commercial software, including thermo-calc, jmat-pro, and dictra. Through selection of appropriate process parameters, the authors found out possibilities of significantly altering the volume fraction, morphology, and grain size distribution of martensite phase. These constituent variations showed a strong influence on tensile properties of DP steels. It was observed that TC route modified the martensite morphology from the typical lath type to in-grain globular/oblong type and significantly reduced the martensite grain size. This route improved the strength–ductility combination from 590 MPa–33% (obtained through CAL route) to 660 MPa–30%. Finally, the underlying mechanisms of crack initiation/void formation, etc., in different DP microstructures were discussed.
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April 2018
Research-Article
Effect of Tailoring Martensite Shape and Spatial Distribution on Tensile Deformation Characteristics of Dual Phase Steels
B. Ravi Kumar,
B. Ravi Kumar
Materials Science and Evaluation (MSE),
CSIR-National Metallurgical Laboratory,
Jamshedpur 831007, India
e-mail: ravik@nmlindia.org
CSIR-National Metallurgical Laboratory,
Jamshedpur 831007, India
e-mail: ravik@nmlindia.org
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Vishal Singh,
Vishal Singh
Mechanical Engineering Department,
Indus International University,
Una 174301, India
e-mail: vishalraizada57@gmail.com
Indus International University,
Una 174301, India
e-mail: vishalraizada57@gmail.com
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Tarun Nanda,
Tarun Nanda
Mechanical Engineering Department,
Thapar University,
Patiala 147004, India
e-mail: tarunnanda@thapar.edu
Thapar University,
Patiala 147004, India
e-mail: tarunnanda@thapar.edu
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Nimai Halder,
Nimai Halder
Engineering Division,
CSIR-National Metallurgical Laboratory,
Jamshedpur 831007, India
e-mail: nimai@nmlindia.org
CSIR-National Metallurgical Laboratory,
Jamshedpur 831007, India
e-mail: nimai@nmlindia.org
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T. Venugopalan
T. Venugopalan
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B. Ravi Kumar
Materials Science and Evaluation (MSE),
CSIR-National Metallurgical Laboratory,
Jamshedpur 831007, India
e-mail: ravik@nmlindia.org
CSIR-National Metallurgical Laboratory,
Jamshedpur 831007, India
e-mail: ravik@nmlindia.org
Vishal Singh
Mechanical Engineering Department,
Indus International University,
Una 174301, India
e-mail: vishalraizada57@gmail.com
Indus International University,
Una 174301, India
e-mail: vishalraizada57@gmail.com
Tarun Nanda
Mechanical Engineering Department,
Thapar University,
Patiala 147004, India
e-mail: tarunnanda@thapar.edu
Thapar University,
Patiala 147004, India
e-mail: tarunnanda@thapar.edu
Manashi Adhikary
Nimai Halder
Engineering Division,
CSIR-National Metallurgical Laboratory,
Jamshedpur 831007, India
e-mail: nimai@nmlindia.org
CSIR-National Metallurgical Laboratory,
Jamshedpur 831007, India
e-mail: nimai@nmlindia.org
T. Venugopalan
1Corresponding author.
Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received April 24, 2017; final manuscript received August 5, 2017; published online September 13, 2017. Assoc. Editor: Hareesh Tippur.
J. Eng. Mater. Technol. Apr 2018, 140(2): 021002 (11 pages)
Published Online: September 13, 2017
Article history
Received:
April 24, 2017
Revised:
August 5, 2017
Citation
Ravi Kumar, B., Singh, V., Nanda, T., Adhikary, M., Halder, N., and Venugopalan, T. (September 13, 2017). "Effect of Tailoring Martensite Shape and Spatial Distribution on Tensile Deformation Characteristics of Dual Phase Steels." ASME. J. Eng. Mater. Technol. April 2018; 140(2): 021002. https://doi.org/10.1115/1.4037659
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