Indian Journal of Science and Technology

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Study on Dual-Phase Structure of AISI4140 Steel


Affiliations
1 Department of Mechanical and Manufacturing Engineering, Manipal Institute of Technology, Manipal University, Manipal – 576104, Karnataka, India
 

Heat treatment is a combination of heating and cooling operations, implemented to a metal or alloys in solid state that will produce desired properties. All basic heat treating processes for steel involve the complete or partial transformation or decomposition of austenite. The nature and appearance of these transformation products determine the physical and mechanical properties of given steel. The present work intended to produce a dual-phase structure in medium carbon low alloy Steel (AISI4140) and experimentally investigating the effects of pretreatments (annealing, normalizing) on austenitisation and hence dual-phase properties of AISI4140 steel. Experimental investigation shows considerable positive effect of initial room temperature structure on the characterization of the heat treated dual phase steel. Annealed dualphase steel has more hardness as compared to normalized dual-phase steel. The dual-phase steel (ferrite-bainite) formed with normalizing as pretreatment has got better impact resistance.

Keywords

AISI4140, Annealing, Dual-Phase (Ferrite-Bainite), Normalizing.
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  • Study on Dual-Phase Structure of AISI4140 Steel

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Authors

B. M. Gurumurthy
Department of Mechanical and Manufacturing Engineering, Manipal Institute of Technology, Manipal University, Manipal – 576104, Karnataka, India
S. S. Sharma
Department of Mechanical and Manufacturing Engineering, Manipal Institute of Technology, Manipal University, Manipal – 576104, Karnataka, India
M. C. Gowri Shankar
Department of Mechanical and Manufacturing Engineering, Manipal Institute of Technology, Manipal University, Manipal – 576104, Karnataka, India
Romit Walia
Department of Mechanical and Manufacturing Engineering, Manipal Institute of Technology, Manipal University, Manipal – 576104, Karnataka, India
Tanishq Agarwal
Department of Mechanical and Manufacturing Engineering, Manipal Institute of Technology, Manipal University, Manipal – 576104, Karnataka, India

Abstract


Heat treatment is a combination of heating and cooling operations, implemented to a metal or alloys in solid state that will produce desired properties. All basic heat treating processes for steel involve the complete or partial transformation or decomposition of austenite. The nature and appearance of these transformation products determine the physical and mechanical properties of given steel. The present work intended to produce a dual-phase structure in medium carbon low alloy Steel (AISI4140) and experimentally investigating the effects of pretreatments (annealing, normalizing) on austenitisation and hence dual-phase properties of AISI4140 steel. Experimental investigation shows considerable positive effect of initial room temperature structure on the characterization of the heat treated dual phase steel. Annealed dualphase steel has more hardness as compared to normalized dual-phase steel. The dual-phase steel (ferrite-bainite) formed with normalizing as pretreatment has got better impact resistance.

Keywords


AISI4140, Annealing, Dual-Phase (Ferrite-Bainite), Normalizing.



DOI: https://doi.org/10.17485/ijst%2F2016%2Fv9i33%2F128186