Research On The Formation Mechanics Of Cast Iron Surface Layer Infiltrated Chromium By Similarity Principle

The object of the thesis is to apply similarity principle to the field of material surface alloy strengthening technology, to find farther essential law in the field. The thesis also analyzes the main element chromium which makes wear resistant role in cast iron surface layer infiltrated chromium by fixed quantity and qualitative method. Similarity principle which combines mathematics analysis with experimentalmethod is the theory to guide experience. The procedure of the model research method guided by similarity principle is to derive similarity criterion by equation analyzing or dimension analyzing and to derive relational expressions of similarity criterion by experiment. The author firstly calculates the minimum formation theory temperature of the alloy layers which inosculates better with experiment conclusion in the thesis and provides the reliable theory base for cast infiltrating technology.The thesis firstly applies computer programme technology to analyze chromium content in the alloy layers by fixed quantity, and builds up the mathematical model of cast iron infiltrate layers chromium content variation curve. The thesis firstly applies infiltrating-surface renew theory to research the fusion layer chromium content variation of the alloy layers by qualitative method , and firstly applies cellular material diffusion theory to research chromium content variation of torch brazing layer and sinter-roasting layer by qualitative method,and proves that the explanation effect of the two theories is more acceptable. The work provides the reliable theory method for realizing the formation mechanics of cast iron surface ally layers and industry application.