Wear behaviour of nitrogen-implanted AISI 420 martensitic stainless steel

Peng

Surface and Coatings Technology

et al. 2016

Nitrogen ions with different energy of 30 keV and 50 keV and dose of 5×10 16 , 5×10 17 and 1×10 18 cm -2 were implanted into the surface of AISI 420 martensitic stainless steel. The micro topography, roughness, friction coefficient, wear loss, hardness, as well as the chemical composition were investigated. Mounds and craters were found on the ion implanted surfaces, indicating increases in the roughness. However, very little changes in friction coefficient were detected after implantation. Nitrogen ions implantation on AISI 420 significantly improved the nanohardness, and the value of 16.2 GPa at the depth of 17.3 nm was about 2.3 times as hard as the untreated samples at the same depth when the implant energy and dose were 50 keV and 5×10 16 cm -2 , respectively. The wear loss of the implanted samples was less than that of untreated ones, and an optional dose of 5×10 17 cm -2 could be used for the wear resistance improvement. XPS results demonstrated that chromium nitrides were produced during ion implantation, which possibly contributes to the improvements of the hardness and wear resistance. The N 1s core spectra showed that nitrogen oxides was found in the samples with higher implantation dose, which had counteraction for the improvements of the hardness. 2

supporting

confidence: 86%

“…Few published works have been reported on surface modification of AISI 420 with ion implantation especially beam ion implantation [12]. And there is also little research on evaluation of the surface properties of AISI 420 with different implantation conditions which include energy and dose.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen ion implantation on the mechanical properties of AISI 420 martensitic stainless steel

Peng

Surface and Coatings Technology

et al. 2016

“…Plasma nitriding is considered an effective technique, in association with other treatments, for improving the tribological properties of these materials. During the 1990s, Offate et al, 1 Sun et al 2 and Tarassov and Kulubaev 3 analysed the wear behaviour and the distorted subsurface structure under different plasma nitriding and tribological conditions. Later, Alphonsa et al, 4 Kim et al 5 and Figueroa et al, 6 among others, characterised the plasma nitriding microstructure for different initial conditions and mixtures of gases present in the chamber.…”

Section: Introductionmentioning

confidence: 99%

Sliding behaviour of ion nitrided AISI 420 stainless steel

Tuckart

Insausti

Forlerer

et al. 2005

Surface Engineering

This paper provides an analysis of the influence of thermal and surface treatments on sliding wear of AISI 420 stainless steel. The specimens were separated into three batches. One was left in the as-received condition for comparison purposes. The other two were subjected to austenitising, oil quenching and tempering at 673 K. One of them was also plasma nitrided under an atmosphere of 25%N2 and 75%H2, at a temperature of 673 K. All the specimens were tested under different normal loads and pure dry sliding conditions. The wear affected surface and subsurface were studied by means of scanning electron microscopy, and phase identification was determined with X-ray diffraction; changes in contact conditions during tests were analysed; initial and final surface roughness were measured. During the tests, surface temperature and friction coefficients were recorded.

“…The same material for friction pairs might not be an optimum choice, which can lead to poor tribological performance. Nevertheless, such a choice could be used to effectively reveal wear mechanisms for the nitrided layer [16]. Sliding velocities were 0.2 and 1.6 m s -1 , respectively.…”

Section: Methodsmentioning

confidence: 99%

A Study of Friction and Wear Behavior of Nitrided Layer on 2cr13 Steel in Vacuum

Yang

Liu

et al. 2010

Tribol Lett

Tribological characteristics and wear mechanisms of gas-nitrided layer on a 2Cr13 steel in vacuum were investigated using a pin-on-disk type tribometer under self-mating dry sliding conditions with various normal loads and sliding velocities. The wear mechanisms involved were investigated by microscopic observations of the worn surfaces, the wear debris, and the corresponding cross sections. Experimental results show that for both sliding velocities of 0.2 and 1.6 m s -1 , friction forces are relatively stable in the case of lower loads (B50 N), whereas become unstable and show high fluctuations under higher loads ([50 N). Wear mechanisms of the nitrided layer in vacuum are different for the lower and the higher sliding velocities. In the former case, mild abrasive wear dominates. In the latter case, a transition takes place from mild adhesive wear to severe adhesive or even delamination wear, with increasing normal load from 10 to 90 N.