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Structure-Property Correlation of Quenching and Partitioning Heat Treated Silicon-Manganese Steel

  • Palaksha Pilar AcharyaEmail author
  • Ravishankar Bhat
Original Paper


The present investigation deals with the effect of varying quenching and partitioning parameters on microstructure and mechanical properties of American Iron and Steel Institute 9255 steel. The specimens were fully austenitised at 900 C for 45 min and then quenched at 190 C and followed by partitioning at various temperatures 280, 320, 360 and 400 C and partitioning times 15, 30, 45, 60 and 90 min for each temperature. Post heat treatment includes microstructural analysis that was carried out by using scanning electron microscope (SEM) along with electron back scattered diffraction (EBSD) and x-ray diffraction (XRD) and then correlated to the mechanical properties i.e. tensile properties and hardness of the steel. Results indicate that the specimens quenched at 190 C and partitioned over a temperature range 280 to 400 C generates multiphase microstructures containing major fraction of martensitic structure (lath and plate-type), transitional ε-carbides in tempered martensite matrix and retained austenite (RA) for all the conditions. At higher partitioning temperatures i.e. 360 and 400 C reveals some bainitic ferrite laths along with martensite and RA. Superior tensile strength, % elongation and modulus of toughness values of 1860 MPa, 12% and 207 MJ/m3 respectively was attained at partitioning time of 15 min at 280 C.


Quenching and partitioning Microstructure and mechanical properties Transitional ε-carbides Tempered-martensite Retained austenite Bainitic ferrite laths 



Martensite start


Martensite finish


Bainite start


Bainite finish


Martensite fraction


Quench temperature


Volume fraction of retained austenite


Integrated intensity of ferrite/martensite


Integrated intensity of austenite


Carbon content in retained austenite


Lattice parameter of austenite


Bragg angle for austenite


Lath Martensite


Plate Martensite



American Iron and Steel Institute


American Society for Testing and Materials


Quenching and Partitioning


Quenching and Tempering


Advanced High Strength Steel


Transformation Induced Plasticity


Optical Emission Spectrometer


Field Electron and Ion


Field Emission Gun


Scanning Electron Microscope


Energy Dispersive X-ray Spectroscopy


Electron Back Scattered Diffraction


Orientation Image Microscopy


X-ray Diffraction


Constrained-Carbon Paraequilibrium


Retained Austenite


Tempered Martensite


Lower Bainite


Upper Bainite


Yield Strength


Ultimate Tensile Strength


EL Percentage Elongation


Modulus of Toughness


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Authors gratefully acknowledge Steelmart, Mumbai, India for providing us this specific grade of steel as per our requirement. We thank Gwasf quality castings Mangaluru, India regarding Optical Emission Spectrometry analysis. We are thankful to National Institute of Technology Karnataka, Surathkal, India for providing us necessary facilities to carry out this investigation. We also express our sincere thanks to Prof. Indradev Samajdhar, Indian Institute of Technology Bombay for extending us the EBSD facility.

Compliance with Ethical Standards

Disclosure statement

No potential conflict of interest was reported by the authors.


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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.Department of Metallurgical and Materials EngineeringNational Institute of Technology KarnatakaSurathkalIndia

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