Thermodiffusion chromizing of austenitic steels
A mechanism is suggested for the formation of coatings by diffusion metallization.
On the basis of the distribution of nickel , measurements of the thickness of the coating, and examination of the microstructure it was found that the coatings consist of a built up diffusion layer and a diffusion layer proper. The thickness of the built up layer was 32 μ on steel Kh18N9 and 35 μ on steel KhN35VT coated at 1100° for 10 h, and the thickness of the diffusion layer proper was 88 and 25 μ respectively.
The distribution of nickel in the chromium coating on austenitic steels is due to diffusion of nickel from the depth of the sample into the built-up layer.
The use of burnishing after chromizing reduces the surface roughness and increases surface hardness.
KeywordsMicrostructure Nickel Chromium Surface Roughness Diffusion Layer
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