Optimisation of Laser Process Parameter on Laser Transformation Hardening of AISI440C

Anil Kumar Jain; A.V. Alias; Abhay Kumar Jha; Parameshwar Prasad Sinha

doi:10.4028/www.scientific.net/MSF.710.203

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HomeMaterials Science ForumMaterials Science Forum Vol. 710Optimisation of Laser Process Parameter on Laser...

Optimisation of Laser Process Parameter on Laser Transformation Hardening of AISI440C

Abstract:

High yield strength and good wear resistance of hypereutectic steels in hardened and tempered condition made them attractive to manufacture rotating parts of mechanical systems. However, they suffered with poor corrosion, owing to high carbon content. The need for a material with improved strength, wear resistance and corrosion resistance for bearing application resulted in the design of a new steel having 17 wt.% Cr, up to 0.75 wt.% Mo and 1 wt.% C, which was christened as 440C. This martensitic grade of stainless steel was surface hardened by laser transformation hardening (LTH) technique using Pulsed Nd: YAG laser. Optimised process parameter could result in 300 µm thick hardened layer consisted of martensite, retained austenite and fine carbide with an average hardness of 540 VHN, while it was about 220 VHN in the core. Laser process parameter like energy/power density, pulse width, scanning speed and overlap ratio were responsible in influencing the microstructural constituents, hardness achievable and in turn dictates the wear resistance capability of the material. Experimental results such as temperature distribution, depth of hardening have been verified analytically. A reasonable agreement between the theoretical and experimental measurements was obtained. This paper highlights the details of experimental work.

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Periodical:

Materials Science Forum (Volume 710)

Pages:

203-207

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.710.203

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Online since:

January 2012

Authors:

Anil Kumar Jain, A.V. Alias, Abhay Kumar Jha, Parameshwar Prasad Sinha

Keywords:

Laser Transformation Hardening (LTH), Martensitic Steel, Wear Resistance

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References

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