Acetylene Flow Rate as a Crucial Parameter of Vacuum Carburizing Process of Modern Tool Steels

• Autorzy: Rokicki P. , Dychton K.

Identyfikatory

DOI

10.1515/amm-2016-0324

• Języki publikacji: EN

Abstrakty

EN

Carburizing is one of the most popular and wide used thermo-chemical treatment methods of surface modification of tool steels. It is a process based on carbon diffusive enrichment of the surface material and is applied for elements that are supposed to present higher hardness and wear resistance sustaining core ductility. Typical elements submitted to carburizing process are gears, shafts, pins and bearing elements. In the last years, more and more popular, especially in highly advanced treatment procedures used in the aerospace industry is vacuum carburizing. It is a process based on chemical treatment of the surface in lower pressure, providing much higher uniformity of carburized layer, lower process cost and much lesser negative impact on environment to compare with conventional carburizing methods, as for example gas carburizing in Endo atmosphere. Unfortunately, aerospace industry requires much more detailed description of the phenomena linked to this process method and the literature background shows lack of tests that could confirm fulfilment of all needed requirements and to understand the process itself in much deeper meaning. In the presented paper, authors focused their research on acetylene flow impact on carburized layer characteristic. This is one of the most crucial parameters concerning homogeneity and uniformity of carburized layer properties. That is why, specific process methodology have been planned based on different acetylene flow values, and the surface layer of the steel gears have been investigated in meaning to impact on any possible change in potential properties of the final product.

Słowa kluczowe

EN

vacuum carburizing; heavily-loaded gears; thermo-chemical treatment; microstructure

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2016
• Tom: Vol. 61, iss. 4
• Strony: 2009--2012
• Opis fizyczny: Bibliogr. 12 poz., rys., wykr.

Twórcy

autor

Rokicki P.

• Rzeszow University of Technology, Research and Development Laboratory for Aerospace Materials, Rzeszow, Poland

autor

Dychton K.

• Rzeszow University of Technology, Research and Development Laboratory for Aerospace Materials, Rzeszow, Poland

Bibliografia

• [1] A. Nowotnik, P. Rokicki, G. Mrówka-Nowotnik, J. Sieniawski Dynamic precipitation of nickel-based superalloys undergoing severe deformation below the solvus temperature, Int. Journal of Materials Research 106, 7 (2015).
• [2] N. M. Ryzhov, A. E. Smirnov, R. S. Fakhurtdinov, Control of Carbon Saturation of the Diffusion Layer in Vacuum Carburizing of Heat-Resistant Steels, Material Science and Heat Treatment 46, 7-8 (2004).
• [3] N. M. Ryzhov, R. S. Fakhurtdinov, A. E. Smirnov, L. P. Fomina, Analysis of Methods of Carburizing of Gears from Heat-Resistant Steels, Material Science and Heat Treatment 52 (2010).
• [4] N. M. Ryzhov, A. E. Smirnov, R. S. Fakhurtdinov, L. M. Mulyakaev, V. I. Gromov, Special Features of Vacuum Carburizing of Heat-Resistant Steel in Acetylene, Material Science and Heat Treatment 46, 5-6 (2004).
• [5] K. Dychton, P. Rokicki, A. Nowotnik, M. Drajewicz, J. Sieniawski, Process temperature effect on surface layer of vacuum carburized lowalloy steel gears, Solid State Phenomena 227 (2015).
• [6] N. Koebel, Application of Instrumentation to Achieve Precision Carburizing, Journal of Heat Treatment 1, 2 (1979).
• [7] Y. P. Usatyi, E. N. Marmer, S. G. Murovannaya, F. A. Palei, L. I. Volkova, Vacuum Carburizing of Steel 18KhGT, Metal Sci. Heat Treat. 19-11 (1977).
• [8] S. N. Tsepov, Characteristic Features of Carburizing of Steel During Vacuum Carburizing, Metal Sci. Heat Treat. 21-8 (1979).
• [9] D. Paun, M. Cojocaru, V. Mihailov, Mathematical Modeling of the Influence of Main Carburizing Thermochemical Treatment Parameters on the Surface Hardness of Parts Made of MSRR 6009 steel, Surface Engineering and Applied Electrochemistry 48, 3 (2012).
• [10] T. Turpin, J. Dulcy, M. Gantois, Carbon Diffusion and Phase Transformations During Gas Carburizing of High-Alloyed Stainless Steels: Experimental Study and Theoretical Modeling, Metallurgical and Materials Transformations A 36 (2005).
• [11] K. Tanaka, H. Ikehata, H. Takamiya, H. Mizuno, Calculation of Microstructure in Vacuum Carburizing Incorporating Kinetics Modeling of Grain-Boundary Cementite, ISIJ International 52, 1 (2012).
• [12] M. E. Williams, A Practical Approach to Carburizing Process Determination, Journal of Heat Treating 2, 1 (1981).