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Sharma, S. S.
- Study on Dual-Phase Structure of AISI4140 Steel
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Authors
Affiliations
1 Department of Mechanical and Manufacturing Engineering, Manipal Institute of Technology, Manipal University, Manipal – 576104, Karnataka, IN
1 Department of Mechanical and Manufacturing Engineering, Manipal Institute of Technology, Manipal University, Manipal – 576104, Karnataka, IN
Source
Indian Journal of Science and Technology, Vol 9, No 33 (2016), Pagination: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.Full Text
- Study of Wear Behavior and Mechanical Mixed Layer on Artificial Aged Al6061 Composite Reinforced with B4C Particles
Abstract Views :190 |
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Authors
Affiliations
1 Department of Mechanical and Manufacturing Engineering, Manipal Institute of Technology, Manipal University, Karnataka – 576104, IN
1 Department of Mechanical and Manufacturing Engineering, Manipal Institute of Technology, Manipal University, Karnataka – 576104, IN
Source
Indian Journal of Science and Technology, Vol 9, No 12 (2016), Pagination:Abstract
Present study emphases on the enhancement in hardness and wear resistance of Al6061 composite reinforced with boron carbide particles of various weight percentage (2, 4 and 6) in peak aged condition during artificial aging. The effect of artificial aging treatment with different aging temperatures of 100, 150 and 200ᴼC was also investigated. Presence of B4C particles in Al6061 alloy accelerating the aging process and thus attain higher strength. These particles provide more sites for the nucleation of fine precipitates. These fine precipitates anchor lattice strain to deform the matrix to increase hardness and wear resistance of materials. The combined effect of B4C and artificial aging at lower temperature shows improvement in hardness by 150-175% and wear resistance by 100% due to the precipitation of secondary solute rich phase of alloying elements and dislocation mobility hindrance. Tribolayer or mechanically mixed layer was observed due to the transfer of material from rotating disc surface to the wear surface of composite, which is believed to be effect of friction and oxidation on iron particles. The results were correlated with the unreinforced Al6061 alloy. The analysis of the unreinforced alloy worn sample surface doesn't show presence of iron in the mechanically mixed layer.Keywords
Al6061 Alloy, Age Hardening, Boron Carbide (B4C), Mechanically Mixed Layer (MML)Full Text