Study On Deform Coordination Behavior In Hot Rolling Process Of Thin Stainless Steel Coated Plate Fabricated By Cold Gas Dynamic Spraying

The stainless steel composite plate had excellent performance of the two metals-coating and substrate, the price also had the incomparable advantage of pure stainless steel. It was paid more attention since developed, the preparation technology became the concern of researchers all over the world. At present, the preparation technology of stainless steel composite plate still had their own advantages and disadvantages, a variety of preparation methods coexisted, the stainless steel producers and researchers needed to work together to improve the existing technology and develop new preparat-ion method. The cold spraying technology had many characteristics, for example, low spraying temperture had little effect on substrate and spraying material, the equip-ment was simple, it had little influence on environment,it also can prepared large area coating and thick coating, the prepared coating can be processed.The stainless steel coating depositing on IF steel substrate by cold spraying technolog fabricated stainless steel/IF steel non thick composite plate, and then rolled the composite plate. Because the temperature strength of stainless steel was greater than IF steel’s, the deform coordination behavior between stainless steel and IF steel was the key and difficult problem of the stainless steel composite plate preparation.The dense304stainless steel coating material was fabricated by cold spraying technology. The hot deformation behavior of the cold sprayed304stainless steel coating material was investigated by the thermo-mechanical simulator. The influence of deformation conditions on deformation resistance, microstructure and microhard-nessthe were discussed. The results showed that deformation temperature was the major factor, deformation rate and reduction were the minor factors. The value of hot deformation activation energy was464.4KJ/mol under the deformation conditions.Simulating composite plate hot rolled deformation by thermo-mechanical simulator proved that the composite plate hot rolled technology was feasible, and the rolling temperature should be above1200℃. Analysising the influence of high temper-ature oxidation on the composite plate, when the temperture was1200℃or above, the oxidation of the stainless steel coating was very serious, insulation treatment of the composite plate should be noticed before rolling. Determining the rolling process to do the trial rolling. Integrated thermal simulation analysis, oxidation analysis and trial rolling result to ascertain the composite plate hot rolling process. By repeat rolling, the thick of the composite plate rolled from10mm to2.3mm, composite plate deformed coordination with no surface cracking.The analysis with rolled composite plate microstructure, microhardness, phase transition, mechanical property and deformation coordination explained reasons for rolling success at1230℃and rolling fail at other two trial rolling temperature.The composite plate rolled at1230℃, four times rolling and each reduction2mm, the stai-nless steel coating and the IF steel substrate deformed coordination without cracking.Cold Spraying+rolling technology was a new, environment friendly and high efficient composite plate preparation method. It had many advantages, such as good product quality, environmental protection, the thickness of the composite plate unrestricted and large-scale continuous production, but the rolling process need further research, the technology was still in the research and development stage. The subject had a very important significance for the development of cold spray technology for industrial application and preparation of stainless steel composite plate.