The effect of working distances on the formation of TiC composite surface hardening using TIG melting technique

Md Idriss, A. N. and Maleque, Md. Abdul and Afiq, A (2021) The effect of working distances on the formation of TiC composite surface hardening using TIG melting technique. In: 5th International Conference on Mechanical, Automotive and Aerospace Engineering 2021 (ICMAAE'21), 22 - 23 June 2021, Virtual. (Unpublished)

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Abstract

Hardening surface layer with and without adding reinforcing material can be achieved by rapid solidification on the top substrate area via high energy input fusion. In this work, the TIG torch heat input at 1344 J/mm is fused at 0.5 mm and 1.5 mm of working distances to incorporate the preplaced TiC particulates on the surface of AISI 4340 low alloy steel. Results pertaining to the microstructural features, melt pool sizes, defects, topographies and microhardness were investigated using the optical microscope, scanning electron microscope and Vickers microhardness tester. The results showed that the heat loss through the arc column at 1.5 mm of working distance resulted small melt pool geometry and poor dissolution of TiC particulates. Narrowing this gap to 0.5 mm increases heating that made more precipitation of TiC whilst minimizing those the undissolved particulates. The surface engulfed with TiC of 0.5 mm near the arc source produced microhardness ranging from 800 HV to 1500 HV. The work suggested that heat fusion can be enhanced by marginal working distance whilst saving the energy to melt instead of increasing the used voltage, current, decreasing scanning speed or by preheating, post heating or adding fluxes shielding with special shielding gasses.

Item Type:	Conference or Workshop Item (Slide Presentation)
Subjects:	T Technology > T Technology (General) > T11.95 Industrial directories T Technology > TN Mining engineering. Metallurgy > TN600 Metallurgy T Technology > TN Mining engineering. Metallurgy > TN799.5 Nonmetallic minerals T Technology > TP Chemical technology > TP200 Manufacture and use of chemicals T Technology > TS Manufactures > TS200 Metal manufactures. Metalworking
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering Kulliyyah of Engineering > Department of Manufacturing and Materials Engineering
Depositing User:	Prof Dr. Md Abdul Maleque
Date Deposited:	28 Jun 2021 10:53
Last Modified:	28 Jun 2021 10:53
URI:	http://irep.iium.edu.my/id/eprint/90440

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