TY - JOUR
T1 - Wear Performance under Dry and Lubricated Conditions of Post Boriding Heat Treatment in 4140 Steel
AU - Morón, R. C.
AU - Arellano-Ortiz, G. A.
AU - Rodríguez-Castro, G. A.
AU - Meneses-Amador, A.
AU - Cruz-Ramírez, A.
AU - Méndez-Méndez, J. V.
AU - Campos-Silva, I.
N1 - Funding Information:
Instituto Politécnico Nacional (Grant No. 20201322; Funder ID: 10.13039/501100003069).
Publisher Copyright:
© 2021 American Society of Mechanical Engineers (ASME). All rights reserved.
PY - 2021/2/1
Y1 - 2021/2/1
N2 - The tribological performance of borided, post borided heat-Treated and uncoated 4140 steel, under dry and lubricated conditions, was studied. The boriding process was conducted by powder-pack method at 900 °C with 1 h of exposure time. After boriding, a heat treatment (quenching and tempering) was conducted to obtain a hardened core microstructure of the 4140 borided steel. The tribological tests were performed with an Al2O3 ball of 6.35 mm of diameter, setting sliding distances of 25, 50, and 100 m. The loads used were 20 and 40 N in dry and lubricated conditions, respectively. Overall samples, the coefficient of friction was reduced around five times when lubricant was used, in comparison to dry tests. After 100 m of sliding distance, it was observed that the wear resistance increased around ten times with boriding. The dry results showed that borided (B) exhibited better wear-rate kB = 7.06 × 10-7 mm3 N-1 m-1 than borided and heat-Treated (BHT) kBHT = 9.93 × 10-7 mm3 N-1 m-1, attributed to its higher hardness. Nevertheless, the lubricated results showed that the surface characteristics of BHT improved its wear resistance kBHT = 5.25 × 10-8 mm3 N-1 m-1 over kB = 1.68 × 10-7 mm3 N-1 m-1 of borided only, because it permitted a better adsorption of the lubricant.
AB - The tribological performance of borided, post borided heat-Treated and uncoated 4140 steel, under dry and lubricated conditions, was studied. The boriding process was conducted by powder-pack method at 900 °C with 1 h of exposure time. After boriding, a heat treatment (quenching and tempering) was conducted to obtain a hardened core microstructure of the 4140 borided steel. The tribological tests were performed with an Al2O3 ball of 6.35 mm of diameter, setting sliding distances of 25, 50, and 100 m. The loads used were 20 and 40 N in dry and lubricated conditions, respectively. Overall samples, the coefficient of friction was reduced around five times when lubricant was used, in comparison to dry tests. After 100 m of sliding distance, it was observed that the wear resistance increased around ten times with boriding. The dry results showed that borided (B) exhibited better wear-rate kB = 7.06 × 10-7 mm3 N-1 m-1 than borided and heat-Treated (BHT) kBHT = 9.93 × 10-7 mm3 N-1 m-1, attributed to its higher hardness. Nevertheless, the lubricated results showed that the surface characteristics of BHT improved its wear resistance kBHT = 5.25 × 10-8 mm3 N-1 m-1 over kB = 1.68 × 10-7 mm3 N-1 m-1 of borided only, because it permitted a better adsorption of the lubricant.
KW - boundary lubrication
KW - dry friction
KW - friction
KW - sliding
KW - surface layers
KW - surface treatments
UR - http://www.scopus.com/inward/record.url?scp=85101784556&partnerID=8YFLogxK
U2 - 10.1115/1.4047789
DO - 10.1115/1.4047789
M3 - Artículo
AN - SCOPUS:85101784556
SN - 0742-4787
VL - 143
JO - Journal of Tribology
JF - Journal of Tribology
IS - 2
M1 - 021702
ER -