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Tribological Performance of Boronized,Nitrided, and Normalized AISI 4140 Steel against Hydrogenated Diamond-Like Carbon-Coated AISI D2 Steel
Authors:Akshay A Joshi  Santosh S Hosmani  Jayshri Dumbre
Affiliation:1. Department of Metallurgy &2. Materials Science, College of Engineering, Pune (COEP), Shivaji Nagar, Pune 411005, Maharashtra, India;3. Advanced Materials &4. Process Technology Center, Global Research &5. Development, Crompton Greaves Ltd., Mumbai, India
Abstract:In the current work, AISI 4140 steel was pack-boronized at 950°C for 3 h and gas-nitrided at 550°C for 72 h. All specimens used in this work were prepared from the same steel bar. A 3-µm-thick diamond-like carbon (DLC) coating (a-C:H) was deposited on the AISI D2 high-carbon, high-chromium, cold-worked tool steel by a plasma-assisted chemical vapor deposition technique. Normalized, boronized, and nitrided steel pins were tested against DLC-coated AISI D2 steel at various normal loads (15, 30, 60, and 80 N) for 1,000 and 3,000 m sliding distance in ambient air. Specific wear rate of all pins decreased with increasing load, and a similar trend was observed for the coefficient of friction (COF). Microscopic and energy-dispersive spectroscopic (EDS) analysis confirmed the role of the transfer layer for a low COF with increasing load. At all loads, the specific wear rate of boronized pins was lower than that of the nitrided and normalized pin specimens. Boronized pins showed a specific wear rate in the range of 0.27 × 10?8 to 0.44 × 10?8 mm3/Nm and the COF was about 0.1.
Keywords:Boronizing  DLC Coating  Nitriding  Tribology  Pin on Disc Test  AISI 4140 Steel
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