The influence of thickness of CrN coating on the durability of hot forging dies
Tóm tắt
This article presents results which enabled the determination of the role of CrN coating and the influence of its thickness on the effectiveness of hybrid layer “nitrided layer / CrN coating” in the process of increasing the durability of forging dies. Dies coated with hybrid layers “nitrided layer / CrN coating” with various CrN coating thickness were — after different maintenance periods — subjected to metallographic testing, 3D shape testing and SEM analysis. Hardness distribution was also determined. The obtained results revealed that for all tested dies, independently from CrN coating thickness, the main mechanisms of their destruction was mechanical and thermal fatigue, and plastic deformation. It has been shown that the main role of CrN coating in the hybrid layer ”nitrided layer / PVD coating” is to counteract a high temperature influence the source of which is forging on die material. In order to do so the CrN coating should be characterized by a considerably lower thermal conductivity coefficient to steel and low hardness so that it can efficiently resist fatigue processes in the forging process. Based on testing conducted by means of the sin
2
φ method, it was revealed that internal stresses are vitally important for CrN coating for fatigue resistance of hybrid layer ”nitrided layer / CrN coating” during the forging process.
Tài liệu tham khảo
Prengel H.G., Pfouts W.G., Santhanan A.T., State of art in the hard coatings for carbide cutting tools, Surface and Coatings Technology 102 (1998) 183
Lim C.Y.H., Lau P.P.T., Lim S.C., Work material and the effectiveness of coated tools, Surface and Coatings Technology 146–147 (2001) 298
Merlo A.M., The contribution of surface engineering to the product performance in the automotive industry, Surface and Coatings Technology 174–175 (2003) 21
Kula P., Surface engineering, Publisher: Technical University by Lodz (2000) ISBN 83-87198-96-X (in Polish)
Hogmmark S., Jacobson S., Larsson M., Design and evaluation of tribological coatings, Wear 246 (2000) 20
Donet C., Erdemir A., Historical developments and new trends in tribological and solid lubricant coatings, Surface and Coatings Technology 180–181 (2004) 76
Mattox D.M., Ion plating — past, present and future, Surface and Coatings Technology 133–134 (2000) 517
Sato T., Sugai K., Ueda S. Matsunami K., Yasuoka M., Development of a hybrid coating process as an advanced surface modification for cutting tools and moulds, Surface and Coatings Technology 169–170 (2003) 45
Gorokhovsky V., et.al., Tribological performance of hybrid filtered arc-magnetron coatings. Part II: Tribological properties characterization, Surface and Coatings Technology 201 (2007) 6228
Matthews A., Leyland A., Hybrid techniques in surface engineering, Surface and Coatings Technology, 71 (1995) 88
Celis J.P., Drees D., Huq M.Z., Wu P.Q., De Bonte M., Hybrid processes — a versatile technique to match process requirements and coating needs, Surface and Coatings Technology, 113 (1999) 165
Yerokhin A.L., Leyland A., Tsotsos C., Wilson A.D. et al., Duplex surface treatments combining plasma electrolytic nitrocarburising and plasma immersion ion assisted deposition, Surface and Coatings Technology 142–144 (2001) 1129
Walkowicz J., Smolik J., Bertrand C, loncea A., Durability of hot forging dies after duplex treatment, Materials Engineering 5 (2005) 281 (in Polish)
Smolik J., Walkowicz J., Tacikowski J., Analysis of wear mechanisms of hot forging tools coated with different composites obtained by duplex treatment method, Proceedings of 3nd COST 516 Tribology Symposium, Eibar, Spain, 18–19.05.2000, Edited by: A. Igartua & A. Alberdi, Fundacion TEKNIKER, Otaola20, 20600 Eibar, Spain, ISBN 84-699-2557-1, 192
Walkowicz J., Smolik J., Miernik K., Bujak J., Modern technologies of increasing tools and machines parts durability, Maintenance Problems 31 (1998) 51 (in Polish)
Panjan P., Urankar I., Navinšek B., Terèlj M., et a l., Improvement of hot forging tools with duplex treatment, Surface and Coatings Technology 151–152 (2002) 505
Navinšek B., Panjan P., Urankar I., Crahte P., et al., Improvement of hot working processes with PVD coatings and duplex treatment, Surface and Coatings Technology 142–144 (2001) 1148
Ma S., Xu K., Jie W., Plasma nitrided and TiCN coated H13 steel by pulsed dc PECVD and its application for hot working dies, Surface and Coatings Technology 191 (2005) 201
Walkowicz J., Smolik J., Bertrand C, loncea A., Application of two stage duplex processes to surface treatment of hot forging dies, Problemy Eksploatacji 2 (2005) 83 (in Polish)
Mazurkiewicz A., Smolik J., Walkowicz J., Effectiveness of industry application of surface treatment technology, Maintenance Problems 3 (2004) 267 (in Polish)
Suchanek J., Smolik J., Walkowicz J., Gulde M., et al., Increase of hot forging tools life-time by duplex treatment, Acta Metallurgica Slovaca 11 (2005) 178
Walkowicz J., Smolik J., Tacikowski J., Optimization of nitrided case structure in composite layers created by duplex treatment on the basis of PVD coating adhesion measurement, Surface and Coatings Technology, 116–119 (1999)370–379
Smolik J., Walkowicz J., Tacikowski J., Influence of the structure of the composite: nitrided layer / PVD coating on the durability of tools for hot-working, Surface and Coatings Technology, 125 (2000) 134–140
Li X. F., Effects of an elastic substrate on the inter-facial adhesion of thin films, Surface and Coatings Technology 200 (2006) 5003
Ma S., Xu K., He J., Parametric effects of residual stress in pulsed d.c. plasma enhanced CVD TiN coatings, Surface and Coatings Technology 142–144 (2001)1023
Katamis T.Z., Chen M., Skolianos S., Chambers B.V., Effect of residual stresses on the strength, adhesion and wear resistance of SiC coatings obtained by plasma-enhanced chemical vapour deposition on low alloy steel, Surface and Coatings Technology 70 (1994)43
Teixeira V., Residual stress and cracking in thin PVD coatings, Vacuum 64 (2002) 393