The Study Of Metallurgy Transmission Process Of The Cast Iron Infiltrated Chromium

With the rapid development of modern industry, the application of strengthening in manufacture is becoming more and more attentive . Compared with other surface intensification methods, Cast-in-place surface alloying has been more and more noticed by people because it is a low-cost , simple and convenient technique which is with a distinct advantage. About this technique , it has been developing very quickly. Especially, on the research of wear resistance people have applied it in production practice. Because some other causes , some industrial products produced still have serious problems ,such as the instabilities of surface alloying layer, inclusions and gas porosities. Moreover, in the its theoretic research field has there not been systematic theory so far. These have deterred the technology development that will be applied in industrial product.In view of above reasons, we have studied the cast-in-surface alloying technique again. Though analyzing technical factors that have effect on cast infiltration quality of product, we have devised a cream test that may testified the cast-in-palace surface alloying technique we have mapped out. Under controlling technique factors, we have produced high quality chromizing cast-infiltration layer .In the process, we have founded an idealistic mathematic model,depicted temperature field cure and analysed heat transfer course too. What' s more, we have estimated and testified the lowest sintering temperature of casting infiltration outer layer. By observing and analyzing the casting test piece, we have found a metallurgical integrating layer that is made up of chromizing cast-iron alloy layer. Though analyzing the infiltration layer, we divide it into fusion layer, brazing layer and heat-agglomerating layer. Relying on energy spectrum analysis and metallographic examination, we have studied and analyzed the spreading the quality course and forming mechanism of the above every layer. At last, we come to that the forming mechanism of chroming alloy layer of cast iron infiltrated chromium depends on intensive heat transfer and quality transmission between molten cast iron and shaped alloy block.