The Study On The Surface Hardness Of Deep Multicomponent Complex Diffusion In ZG1Cr18Ni9 Austenite Stainless Steel

In this paper, we have used chemical heat treatment of deep multicomponent complex diffusion, mainly chromizing and carburizing to improve ZGlCrl8Ni9 austenite stainless steel, and considered to use rare earth element which is rich in our own country and the complex diffusive reagents which contains W, Mo, Ni, Co and Mn, etc. At last we have carried out the complex heat treatment by paste smearing and coating, general diffusion at high temperature, spreading diffusion and tempering.We have discussed the correlation of technology of general diffusion, spreading diffusion and tempering with the metal phase, depth, hardness, wear resistance, corrosion resistance and corrosion-wear resistance of the diffusive layer. By observation of micro-structure and analysis of X-ray diffraction, in the process of general diffusion, at first, we can get Cr23C6 on the surface of the diffusive layer, and as the increase of time carbon content, we can get Cr7C3-. After general diffusing for 1150℃x 8h, from surface to interior, the structure of the complex diffused layer on the ZGlCrl8Ni9 substrate isA + (Cr.M)7C3 -->A + (Cr.M)7C3 + (Cr.M)23C6 -->A+(Cr.M)23C6 -->A.After general diffusion for 1150℃ X 8h, spreading diffusion for 1150℃ X 2h, then tempering at different temperature (250℃X In, 450℃x lh, 520℃x 4h), all of the depth of diffusive layer, hardness and wear resistance of ZGlCrl8Ni9 steel can reach or even exceed the demand of the technological index. On the base of the resources of our own country, we have successfully resolved the work to expose and replace the Japanese patent technology of the hardening on the Austenite stainless steel surface...