Effect of Heat Treatment Temperature on the Microstructure, Wear and Friction of Ni–Nb–V Alloyed Manganese Steel


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Ayadi S., Hadji A., Kaleli E. H.

International Journal of Metalcasting, sa.-, ss.1-14, 2024 (SCI-Expanded)

Özet

The focus of this work is the effect of heat treatment temperature

upon the microstructure, hardness, wear and friction

of high manganese steel produced in an industrial

setting. The obtained steels were subjected to two heat

treatments, one at 1050 C and the other at 1100 C followed

by water quenching. The microstructures were characterized

by optical microscopy and scanning electron

microscopy equipped with an energy-dispersive spectrometer.

Rockwell C hardness and Vickers microhardness were

also measured. Wear behavior in dry conditions was investigated

under a load of 300 N using pin-on-disk method.

Tribological behavior in boundary lubricated conditions

under a load of 60 N at high temperature (100 C) was

studied using a custom-made reciprocating tribometer by

measuring the mass loss and the friction coefficient. A 5W-40

engine oil was used as lubricant. Atomic force microscopy

(AFM) analysis and roughness 2D and 3D of the tested

samples were measured. The obtained results showed that in

the as-cast state, the added elements favored the formation of

simple or complex inter- and intragranular carbides. In the

heat-treated state, the microstructure of the examined steels

consists of retained austenite, martensite and precipitates.

Increasing of heat treatment temperature increases the rate

of the formed martensite. Formation of secondary carbides

and increasing of martensite amount led to the improvement

of hardness and wear resistance.