Indian Journal of Science and Technology

Abstract

Objectives: To increase the corrosion resistant property of C60 steel so that it can sustain high temperature corrosion at high temperature applications. Methods: The Friction Stir Processing (FSP) was done on C60 steel with tungsten carbide tool under three different rotational speeds 200 rpm, 400 rpm, 600 rpm, feed rate of 40 mm/min with plunge depth of 1 mm. Findings: The behavior of Friction Stir Processed (FSP) C60 steel for hot corrosion was studied in the salt environment at 900°C for 50 cycles; every cycle consisted of heating at 900°C for 1 hour followed by 20 min of cooling in air at room temperature. The weight change per unit area was reported after each cycle for bare and friction stir processed samples, to access the corrosion kinetics. EBSD, SEM/EDS, optical microscopy analyses techniques were used to characterize corroded samples. Improvements: FSPed samples were found to offer high corrosion resistance to bare steel; this may be due to presence of dense protective scale as a result of refined grains. The process can be used for various applications of automobiles and for material surface treatment.

Keywords: Friction Stir Process, Grain Refinement, Hot Corrosion