Diffusion mechanism and rules of nickel on surface of low carbon steel

doi:10.13251/j.issn.0254-6051.2023.05.020

Abstract

Abstract: Nickel/low carbon steel surface composites were successfully prepared by means of aqueous solution electrodeposition+high temperature solid diffusion method. The diffusion mechanism of nickel on the surface of low carbon steel was studied. The diffusion rules of nickel on the surface of low carbon steel at different temperatures were obtained by using Den Broeder method. The results show that high temperature solid diffusion annealing realizes the metallurgical combination of nickel deposit layer and low carbon steel. Nickel atoms mainly diffuse along the grain boundary of low carbon steel, and its diffusion inhibits the growth of grains. Carbon, silicon, manganese, sulfur and phosphorus atoms have little influence on the diffusion of nickel atoms. The solid state diffusion rule of nickel atom on surface of the low carbon steel is D_Ni=-3.53×10^-21T⁴+1.75×10^-17T³ -3.22×10^-14T²+2.60×10^-11T -7.81×10^-9. During solid state diffusion at 973-1373 K, the average interdiffusion coefficient of nickel atoms increases first, then decreases and then increases with the increase of temperature. The crystal structure has a great influence on the diffusion of nickel atoms, and the diffusion speed of nickel atoms in the body centered cubic crystal structure is obviously higher than that in the face centered cubic crystal structure.

Key words: nickel/low carbon steel surface composite, interdiffusion coefficient, diffusion mechanism, diffusion rules

CLC Number:

TB331

Zhang Shixian, Xu Mingyue, Zhao Xiaoping, Li Yungang. Diffusion mechanism and rules of nickel on surface of low carbon steel[J]. Heat Treatment of Metals, 2023, 48(5): 121-128.

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