Effect of Heat Input on Microstructure, Friction and Wear Properties of Fe-Cr-B-C Coating on AISI 1020 Surface Coated by PTA Method

Year 2017, Volume: 12 Issue: 2, 43 - 52, 01.10.2017

Turan Gürgenç , Cihan Özel

Abstract

In
this study, low carbon steel AISI 1020 surface was coated in different heat
inputs with (%-wt.) 70FeCrC-30FeB ferro alloy powder mixture by using plasma
transferred arc (PTA) welding method. The microstructure of the coating layers
were investigated by using optical microscope (OM), scanning electron
microscope (SEM),     X-ray diffraction
(XRD) and energy dispersive X-ray (EDS). The dry sliding wear and friction
properties were determined using a block-on-disc type wear test device. Wear
tests were performed at 19.62 N, 39.24 N, 58.86 N load and the sliding distance
of 900 m. The results were show that coated samples were consisted of mostly M₇C₃
(M=Cr, Fe) carbide, (Cr, Fe)B, FeB and Fe₂B boride. It was seen that
the dendrites were growth with increasing heat input. The highest average microhardness
value was measured 1096 HV on sample coated with low heat input. It was
determined that the sample with the highest wear resistance was the sample
coated by the low heat input.

Keywords

PTA welding, AISI1020, Fe-Cr-B-C coating, Wear, Friction

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