Abstract
A two-stage surface treatment of steel is described. During the first stage, a steel surface is coated with an Fe–14% Ni electrodeposit having an initial hardness of 300–400 HV. Subsequently, the microstructure and hardness of the coatings are modified by thermal and thermochemical treatment. The annealing at temperatures between 500 and 1000 °C leads to the diffusion of carbon from the substrate to the coating and an increase in coating hardness after cooling. In some cases, the enrichment of coating in carbon is enhanced by applying an external source of carbon and nitrogen. As an example, carburizing and carbonitriding in solid media are presented. Owing to a difference in the temperature of the α–γ phase transformation between the steel substrate and the Fe–Ni coating, the thermal treatment is conducted at a coexistence of α–γ or γ–γ diffusion couples. This allows us to obtain the various microstructure and depth-profiles of hardness across the coating thickness and the adjacent region of the substrate. Some benefits of the proposed surface treatment are discussed.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
F. Czerwinski, H. Li, F. Megret, J. A. Szpunar, A. Clark and U. Erb, Scripta Mater. 37 (1997) p. 1967.
K. N. Strafford, P. K. Datta and J. S. Gray, “Surface Engineering Practice, Process, Fundamentals and Applications in Corrosion and Wear” (Ellis Horwood, New York 1990) p. 399.
M. P. Mielkow, “Coatings for the Automotive Industry” (Publ. Transport, Moscow 1971).
F. Czerwinski, Thin Solid Films 280 (1996) 199.
F. Czerwinski and Z. Kedzierski, J. Mater. Sci. 32 (1997) 2957.
W. H. Safranek, “The Properties of Electrodeposited Metals and Alloys” (Elsevier, Amsterdam 1974).
A. D. Roming and J. I. Goldstein, Metall. Trans. 11 (1980) 1151.
F. Czerwinski, J. Electroch. Soc. 143 (1996) 3327.
G. Krauss, “Physical Metallurgy and Heat Treatment of Steel”, in “Metals Handbook Desk Edition” (ASM, Materials Park 1985).
T. Bell, Heat Treat. Metals 2 (1975) p. 39.
H. D. Merchant and O. B. Girin, in “Electrochemical Synthesis and Modification of Materials”, edited byP. Andricacos et al., (MRS, Pittsburgh, PA 1997) p. 433.
F. Czerwinski, A. Zielinska-lipiec and J. A. Szpunar, in “Textures of Materials-ICOTOM-11”, edited byZ. Liang et al. (International Academic Publishers, Beijing 1996) p. 1132.
K. Kondo, T. Murakami, F. Czerwinski and K. Shinohara, ISIJ Int. 37 (1997) 140.
F. Czerwinski, K. Kondo and J. A. Szpunar, in “Electrochemical Synthesis and Modification of Materials”, edited byP. Andricacos et al., (MRS, Pittsburgh, PA 1997) p. 445.
P. Shewmon, “Diffusion in Solids” (TMS, Warrendale, PA 1989).
R. W. Hertzberg, “Deformation and Fracture Mechanics of Engineering Materials” (Wiley, New York 1976).
H. Kanayama and A. Ichihara, Kawasaki Steel Tech. Rep. 7 (1983) 9.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Czerwinski, F. Diffusion annealing of Fe–Ni alloy coatings on steel substrates. Journal of Materials Science 33, 3831–3837 (1998). https://doi.org/10.1023/A:1004639101022
Issue Date:
DOI: https://doi.org/10.1023/A:1004639101022