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

  • Palaksha Pilar Acharya
  • Ravishankar Bhat
Original Paper
  • 18 Downloads

Abstract

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.

Keywords

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

Nomenclatures

Ms

Martensite start

Mf

Martensite finish

Bs

Bainite start

Bf

Bainite finish

fm

Martensite fraction

Tq

Quench temperature

Vγ

Volume fraction of retained austenite

Iα

Integrated intensity of ferrite/martensite

Iγ

Integrated intensity of austenite

Cγ

Carbon content in retained austenite

aγ

Lattice parameter of austenite

𝜃γ

Bragg angle for austenite

ML

Lath Martensite

MP

Plate Martensite

Abbreviations

AISI

American Iron and Steel Institute

ASTM

American Society for Testing and Materials

Q&P

Quenching and Partitioning

Q&T

Quenching and Tempering

AHSS

Advanced High Strength Steel

TRIP

Transformation Induced Plasticity

OES

Optical Emission Spectrometer

FEI

Field Electron and Ion

FEG

Field Emission Gun

SEM

Scanning Electron Microscope

EDX

Energy Dispersive X-ray Spectroscopy

EBSD

Electron Back Scattered Diffraction

OIM

Orientation Image Microscopy

XRD

X-ray Diffraction

CCE

Constrained-Carbon Paraequilibrium

RA

Retained Austenite

TM

Tempered Martensite

LB

Lower Bainite

UB

Upper Bainite

YS

Yield Strength

UTS

Ultimate Tensile Strength

%

EL Percentage Elongation

MT

Modulus of Toughness

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Notes

Acknowledgements

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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