Influence of Titanium on dry sliding Wear Behaviour of Sintered P/M low Alloy Steel (Fe-C-W)

Abstract

Powder metallurgy (P/M) manufacturing process is one of the rapidly emerging fields and has extended the applications in aerospace, automotive, manufacturing industries replacing all traditional methods of metal forming operations because of its less energy consumption, maximum material utilization, low relative material wastage, low capital cost. The mechanical properties is mainly depends on the final density of sintered P/M alloys. The typical microstructure characteristics of sintered steel represent an important parameter affecting their wear behaviour. The present research work pertains to the study of dry sliding wear characteristics of sintered P/M Fe-1%C-1%W-1%Ti low alloy steel with different densities (85%, 90%, 95%), as they find several applications in manufacturing industries, particularly in automobile industries. These components usually face workingconditions involving abrasion, rolling and sliding, making it important to study the wear phenomenon. The wear behavior of the as-sintered preforms were studied under dry conditions on pin-on disc arrangement (ASTM G99) against EN 38 steel disc of Hardness HRC 60 with a sliding speed of 2 m/s and at a normal loads of 30, 50, 70N respectively. Wear mechanism of the worn out surfaces and microstructure of sintered P/M alloy steel has been characterized using both optical microscopy and SEM. Ferritic-pearlite microstructure are revealed from the as-sintered P/M alloy steels. Wear rate increases gradually with increase in porosity with respect to applied load. The main wear mechanism in the Ti alloyed P/M steel seems to be delamination wear in the higher load and oxidation wear at lower load. Failure by a delamination process is clearly indicated by the shape of the debris particles.

A Cold-Pressing Method Combining Axial and Shear Flow of Powder Compaction to Produce High-Density Iron Parts

“…The shown porosity of the preforms can influence positively on heat and wear resistance, tensile strength (~30% by analyzed data) of the final product [76][77][78][79][80][81][82]. It should be noted that ultimate stress tensile was pre-estimated by true-stress true-strain tensile test and fitting curves for bulk specimens obtained by equations shown in [65] and the Ludwik equation [83].…”