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Friction wear resistance of 42CrMo4 surface layer after low-pressure ferritic nitrocarburising (FNC)

Pawęta S., Pietrasik R., Wołowiec-Korecka E.

Archives of Materials Science and Engineering

2024

Vol. 129, nr 1

24--30

Purpose: The work aimed to assess the performance properties of layers produced using the low-pressure ferritic nitrocarburising technology, in particular wear resistance under friction conditions. The assessment has been made in relation to analogous elements subjected only to heat treatment (hardening with tempering). Design/methodology/approach: The material for the tests consisted of two groups of friction pairs (5 friction pairs in each group) made of 42CrMo4 steel. The 42CrMo4 steel has been heat-treated (hardening at 880°C in oil, tempering at 570°C for 2 hours). Half of the samples have been subjected to low-pressure ferritic nitrocarburising at 560°C for 6 hours. The friction test has been conducted according to the PN-75/M-04308 standard for 2 minutes at a load of 445 N. Findings: The test results showed that the elements after ferritic nitrocarburising had almost twice the surface hardness (662 HV1) than the control group (339 HV1). The average weight wear of the heat-treated and ferritic nitrocarburised elements has been 0.011 g, with an average wear in the control group of 1.022 g. The average friction coefficient in the heat-treated and ferritic nitrocarburised friction pairs was 0.188, while in the heat-treated only pairs, it was 0.358. The Man-Whitney U test has shown that the differences between the average weight wear and the average friction coefficient values are significant (p<0.05). Research limitations/implications: The paper investigates the effect of low-pressure ferritic nitrocarburising technology on the surface layer of steel materials. Practical implications: Low-pressure ferritic nitrocarburising technology shows the potential for practical applications in industrial reality at a level at least equivalent to those currently used worldwide. Originality/value: It is the first known publication on the effect of low-pressure ferritic nitrocarburising technology on the performance properties of the surface layer of elements improved by this method.