Effect of pulse on the surface properties of mild steel using TIG torch process

Ahmad Zubir, Muhammad Abu Huzaifah (2023) Effect of pulse on the surface properties of mild steel using TIG torch process. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Mild steel is a type of steel that is low in carbon content and has a relatively low tensile strength. It is also known as low-carbon steel or plain-carbon steel. This steel is widely used in various industries such as production of buildings, bridges, and other infrastructure. It is also used in the manufacturing of machinery and equipment, as well as in the automotive and aerospace industries. However, this material experienced wear and hardness failure during service. Therefore, a new development of surface modification has been introduced in this work by depositing the alumina powder into mild steel via TIG torch melting techniques. The process parameter for this works consists of pulse in the range from 1 to 10 pulse per second (PPS) and current from 80 A to 100 A. The hard surface layer produced from the surface modification was characterized using optical microscope, scanning electron microscopy (SEM), hardness tester, X-ray diffraction (XRD) and surface roughness tester. Based on the experimental results, it was found that the hard surface layer produced maximum hardness of 95.63 HRB with melt layer of 4.1 mm in sample processed under pulse of 1 PPS. The development of martensite structure contributes to the increment of hardness properties. It was found that the intermetallic compound of FeAl and FeO3 were detected from XRD result which indicating the existence of alumina particles in the hard surface layer. In overall, it can be demonstrated that this surface modification is capable to produce hard surface layer on mild steel with higher hardness and better surface roughness properties which can be used for wear application in various industries.

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