TY - JOUR T1 - Surface improvement of 42CrMo4 low alloy steel via nitrocarburization and electroless Ni-P plating: enhancing the surface hardness AU - Varol, Temel AU - Yıldız, Uğur Temel AU - Day, Burak Berk AU - Kandemir, Büşra AU - Alptekin, Furkan AU - Günaçar, Ahmet Fuat PY - 2024 DA - June Y2 - 2024 JF - The International Journal of Materials and Engineering Technology JO - TIJMET PB - Necip Fazıl YILMAZ WT - DergiPark SN - 2667-4033 SP - 18 EP - 21 VL - 7 IS - 1 LA - en AB - This investigation endeavors to enhance the surface characteristics of 42CrMo4 low alloy steel, a material of considerable prominence within the defense industry, and particularly in the context of handgun production. The augmentation is pursued through the implementation of nitrocarburization and electroless Ni-P plating processes. Commencing with 42CrMo4 steel samples characterized by an initial hardness of 303.4±12.3 HV0.1, the specimens underwent a meticulous nitrocarburization procedure. The resultant nitrocarburized surface was subject to characterization via microhardness measurements adhering to the DIN 50190 standard, revealing pertinent hardness and diffusion depth values of 566 HV0.1 and 132.60 µm, respectively. The electroless Ni-P plating was executed over a 45-minute duration at 90⁰C, employing proprietary chemicals. Post-plating, the samples underwent heat treatment at 250⁰C for durations of 4 and 8 hours, strategically designed to optimize the hardness of the electroless Ni-P plating. Coating thickness and microhardness assessments were conducted leveraging a metallurgical microscope and a Vickers hardness tester. Observed coating thicknesses ranged from 10.91 µm to 14.81 µm. The initial hardness of the electroless Ni-P plating, as measured, stood at 563±33 HV0.01. Subsequent heat treatments at 250⁰C for 4 and 8 hours resulted in an appreciable augmentation of the coating hardness to 715±24 HV0.01 and 852±42 HV0.01, respectively. In summation, the electroless Ni-P plating process manifested a notable elevation in the initial hardness of 42CrMo4 low alloy steel from 303.4±12.3 HV0.1 to 852±42 HV0.01 on the surface. Concurrently, the nitrocarburization process engendered a gradual decline in hardness from 566 HV0.1 to core hardness, spanning a distance of 132.60 µm from the surface. This symbiotic integration results in a composite structure characterized by a resilient and wear-resistant surface superimposed with a subsurface conducive to sustaining the hardened coating. KW - Materials Science KW - Nitrocarburization KW - Electroless Ni-P Plating KW - Surface Hardness KW - Steel CR - Boßlet, J., Kreutz, M., Tenifer-QPQ-Verfahren, Mannheim, Durferrit GmbH, 2017 CR - Babul, T., Nakonieczny, A., Senatorski, J., Structure and properties of nitrocarburized diffusion layers generated on high-speed steels. J. of Materi Eng and Perform, 2003, 12, 696–700 CR - Elhadj, G., Tahar, H.M., Djebaili, H., Effect of salt bath nitriding on surface roughness behaviour of AISI 4140 steel, Acta Metallurgica Slovaca, 2017, 23(1): 45-54 CR - Du, H., Somers, M.A.J., Agren, J. Microstructural and compositional evolution of compound layers during gaseous nitrocarburizing, Metall Mater Trans A, 2000, 31, 195–211 CR - Lampe, T., Eisenberg, S., Laudien G., Compound Layer Formation During Plasma Nitriding and Plasma Nitrocarburising, Surface Engineering, 1993, 9(1):69-76 CR - Totten, G.E., Steel heat Treatment; Metallurgy and Technologies 2. edition, 2006 CR - Fares, M.L., Touhami, M., Belaid, M., Bruyas, H. Surface characteristics analysis of nitrocarburized (Tenifer) and carbonitrided industrial steel AISI 02 types, Surface and Interface Analysis, 2009, 41, 179 – 186 CR - Sohi, M.H., Ebrahimi, M., Raouf, A.H., Mahboubi, F., Comparative study of the corrosion behaviour of plasma nitrocarburised AISI 4140 steel before and after post-oxidation, Materials & Design, 2010, 31(9): 4432-4437 CR - Brenner, A., Riddel, G.E., Nickel Plating on Steel by Chemical Reduction, Journal of Research of the National Bureau of Standards, 1946, 37(1):3134 CR - Schlesinger, M., and Paunovic, M., Modern Electroplating., 5th ed. Hoboken N.J: Wiley, 2010 CR - Loto, C.A., Electroless Nickel Plating – A Review, Silicon, 2016, 8, 177–186 CR - Bernasconi, R., Natale, G.V., Levi, M., Magagnin, L. Electroless plating of NiP and Cu on polylactic acid and polyethylene terephthalate glycol-modified for 3D printed flexible, Journal of The Electrochemical Society, 2016, 163(9):D526 CR - Garcia, A., Berthelot, T., Viel, P., Mesnage, A., Jégou, P., Nekelson, F., Roussel, S., Palacin, S., ABS Polymer Electroless Plating through a One-Step Poly(acrylic acid) Covalent Grafting, ACS Applied Materials & Interfaces, 2010, 2(4):1177-1183 CR - Avelar-Batista, J.C., Spain, E., Letch, M., Housden, J., Beechey, R., Improvements on the wear resistance of high thermal conductivity Cu alloys using an electroless Ni–P coating prior to PVD deposition, Surface and Coatings Technology, 2006, 201(7):4052-4057 CR - Anijdan, S.H., Sabzi, M., Zadeh, M.R., Farzam, M., The Effect of Electroless Bath Parameters and Heat Treatment on the Properties of Ni-P and Ni-P-Cu Composite Coatings. Materials Research-ibero-american Journal of Materials, 2018, 21 CR - DIN EN 10083-3 Steels for quenching and tempering- Part 3: Technical delivery conditions for alloy steels English Version of DIN EN 10083-3:2007-01, DIN Deutsches Institut für Normung e.V., Berlin Germany, 2007 CR - DIN 50190-3, Hartetiefe warmebehandelter Teile, Ermittung der Nitrierharteteife, DIN Deutsches Institut für Normung e.V., Berlin, Germany, 1979 CR - Doan, V., Kusmic, D., Pospíchal, M., Tran, Q., Nguyen, V., Friction and Wear Behaviour of 42CrMo4 Steel Treated by Tenifer, Hard Chrome and Plasma Nitriding Technologies. Manufacturing Technology, 2017, 17, 168-174 CR - Apachitei, I., Duszczyk, J., Katgerman, L., Overkamp, P.J.B., Electroless Ni–P Composite Coatings: The Effect of Heat Treatment on the Microhardness of Substrate and Coating, Scripta Materialia, 1998, 38(9): 1347-1353 CR - Baudrand, D.W., Electroless Nickel Plating, Surface Engineering, Vol 5, ASM Handbook, Edited By. Cotell, C.M., Sprague, J.A., F.A., Smidt, Jr., ASM International, 1994, 290–310 UR - https://dergipark.org.tr/en/pub/tijmet/issue//1403290 L1 - https://dergipark.org.tr/en/download/article-file/3592638 ER -