Particulate composite surface by TIG torch surfacing

• Main Author: Maleque, Md. Abdul
• Format: Conference or Workshop Item
• Language: English; English
• Published: 2017
• Subjects: T11.95 Industrial directories; TA401 Materials of engineering and construction; TN600 Metallurgy; TS200 Metal manufactures. Metalworking
• Online Access: http://irep.iium.edu.my/58107/2/ppt%20slide%20keynote%20speech%20AMCT17.pdf; http://irep.iium.edu.my/58107/4/Program%20book%20AMCT17.pdf; http://irep.iium.edu.my/58107/

The particulate composite surfaces have been developed in thick surface layers on a low alloy steels by preplacing different ceramic carbide particles into a shallow melt pool produced on a moving sample using traditional TIG torch melting technique. Surface layers ranging in thickness from 0.05 to 1.0 mm are formed, the thickness being determined by the process variables of heat input, particles feed rate and gas flow rate. Typical operating conditions employ TIG input energies, preplaced particle amount, gas flow rate and working distance. The composite surface was investigated by a diversity of techniques, including optical microscopy, scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), X-ray diffraction (XRD) and Microhardness testing. This paper discusses the types of surface morphology or structures which have been produced by preplacing ceramic particles on the substrate of low alloy steels and TIG melting/particle injection process (so called re-solidification process) and considers the effect upon these structures developed by different processing parameters which in turn change the mode of dissolution or particle reeling. Special consideration is given to the degree of hardness development on the particulate composite surface after re-solidification via TIG torch melting technique.