ISSN 2594-5327
51th Congresso anual — Vol. 52 , num. 1 (1997)
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Abstract
Diffusion coatings have been used increasingly to improve surface properties of several machine components for tribological applications. In this investigation, the abrasive wear of various diffusion coatings used in the manufacture of several hydraulic cylinders has been studied. These coatings, developed by three different nitrocarburizing processes—namely salt-bath, gas, and plasma nitrocarburizing—were conducted on five various steel substrates: St 52-3, Ck 45, 42 CrMo 4, 30 CrNiMo 8, and X 20 Cr 13. The thickness of the compound layers and their porosity were measured using optical microscopy. The structure of compound layers was characterized using an X-ray diffractometer, and their surface roughness by a stylus profilometer. The surface hardness measurements and hardness profiles were made according to the Vickers principle. The simulation of the real abrasive wear of the hydraulic cylinders was carried out using a pin-on-table machine. The operating mechanisms during the wear process were evaluated using scanning electron microscopy. It was found that the nitrocarburizing processes used have improved the abrasion resistance of all tested coating–substrate combinations. In general, the abrasive wear rate decreases as the hardness and thickness of the compound layer is increased. The most improved coated specimens in terms of improved abrasion resistance were the salt-bath and gas nitrocarburized specimens of the substrate X 20 Cr 13, whereas plasma nitrocarburized specimens of the substrates St 52-3 and Ck 45 showed the least improvement.
Diffusion coatings have been used increasingly to improve surface properties of several machine components for tribological applications. In this investigation, the abrasive wear of various diffusion coatings used in the manufacture of several hydraulic cylinders has been studied. These coatings, developed by three different nitrocarburizing processes—namely salt-bath, gas, and plasma nitrocarburizing—were conducted on five various steel substrates: St 52-3, Ck 45, 42 CrMo 4, 30 CrNiMo 8, and X 20 Cr 13. The thickness of the compound layers and their porosity were measured using optical microscopy. The structure of compound layers was characterized using an X-ray diffractometer, and their surface roughness by a stylus profilometer. The surface hardness measurements and hardness profiles were made according to the Vickers principle. The simulation of the real abrasive wear of the hydraulic cylinders was carried out using a pin-on-table machine. The operating mechanisms during the wear process were evaluated using scanning electron microscopy. It was found that the nitrocarburizing processes used have improved the abrasion resistance of all tested coating–substrate combinations. In general, the abrasive wear rate decreases as the hardness and thickness of the compound layer is increased. The most improved coated specimens in terms of improved abrasion resistance were the salt-bath and gas nitrocarburized specimens of the substrate X 20 Cr 13, whereas plasma nitrocarburized specimens of the substrates St 52-3 and Ck 45 showed the least improvement.
Keywords
nitrocarburizing, abrasion resistance, hydraulic cylinders, diffusion coatings, surface hardness
nitrocarburizing, abrasion resistance, hydraulic cylinders, diffusion coatings, surface hardness
How to cite
AlRubaie, Kassim S.; Steinmeier, Frank; Pohl, Michael.
A Comparative Study on Abrasion Performance of Nitrocarburized Steels for Hydraulic Cylinders,
p. 4197-4219.
In: 51th Congresso anual,
São Paulo, Brasil,
1997.
ISSN: 2594-5327, DOI 10.5151/2594-5327-C00268-4197-4219
