Studies On The Roll-forming And Properties Of Stainless Steel/Aluminum/Stainless Steel Laminated Sheet

With the development of economic, the requirement for resources increasingly augments and many kinds of natural resources are lacking. Composite materials need be exploitured to meet the requirement for economic resources, lighten weight, and improve the property of production such as stainless steel/aluminum (aluminum alloy)/ stainless steel. This combined smooth surface as well as light, cheap of stainless steel. Not only easy to clear and being corrode-resistance, but also economic rare the elements of chromium and nickel. Composite materials of stainless steel/aluminum (aluminum alloy)/ stainless steel will be promising in the fields of aviation, spaceflight, chemistry, medical treatment and food industry.In this paper, stainless steel/aluminum(aluminum alloys)/stainless steel sandwich sheet was produced by hot roll-bonding, and meanwhile the bonding process, properties and micro-structure of this material had been studied by means of SEM, OM et al. The results are illustrated as follows: Surface preparation before rolling has an important effect on the strength of bonding of laminated sheet. The bond strength of the laminated sheet treated with burnished method had the highest values, and the laminated sheet treated only with normal chemical method had the lowest strength. The roll-bonding temperatures and the first reduction had a fundamental effect on the properties of the laminated sheets. The laminated sheets had optimal properties when rolled at 500℃ with the first reduction of 40%. The annealing temperature had an important effect on the properties of the cladding sheets. The cladding sheets annealed at 420 ℃ had the best integrated properties. Increasing the heating temperature and annealing temperature (below 500℃) could enlarge the diffusion length of elements, which lead to improve the bond strength of sandwich sheet, and the higher the temperature was, the better the bondwas. The midst layer (aluminum) was restricted by the outer layer (stainless steel) because of small yield strength, large deforming and fast rate of flow. The stainless steel layer was subjected additional tension stress and the aluminum layer was subjected residual compression stress. According to many comparison experiments the result showed that the general formability of five-layer laminated sheets was higher that of sandwich sheet.