The process characteristics of heat treatment of aluminum alloy auto body sheet and the working principle of air cushion furnace were introduced.The process position and irreplaceable role of air cushion furnace in th...The process characteristics of heat treatment of aluminum alloy auto body sheet and the working principle of air cushion furnace were introduced.The process position and irreplaceable role of air cushion furnace in the aluminum alloy auto body sheet production was pointed out after the difficulty and key points in the whole production process of auto body sheet were studied.Then the development process of air cushion furnace line of aluminum alloy sheet was reviewed,summarized and divided to two stages.Based on the research of air cushion furnace,the key technology of it was analyzed,then the key points on process,equipment and control models of air cushion furnace for aluminum alloy auto body sheet in future were put forward.With the rapid development of automotive industry,there will be certainly a new upsurge of research and application of air cushion furnace for heat treatment of aluminum alloy auto body sheet.展开更多
The effect of pre-aging treatment on the tensile properties,formability and microstructures of 2036 aluminum alloy for automobile body sheets were investigated through the tensile tests,DSC analysis and TEM observatio...The effect of pre-aging treatment on the tensile properties,formability and microstructures of 2036 aluminum alloy for automobile body sheets were investigated through the tensile tests,DSC analysis and TEM observation. The results show that the alloy was softened,which was pre-aged at 180 ℃ within 20 min and then natural aging,namely T4P. However,the yield strength decreases first and then rises. The yield strength of the alloy after T4P(10 min) reach the minimal 202.3 MPa,but the elongation and strain hardening exponent arrive at the maximum,25.5% and 0.26 respectively,which can improve its formability effectively. In the early stage of T4P,GP zones dissolve,and generate some θ″ nuclei,so that the strengthening effect is restrained during the natural aging following the pre-aging. With the increment of pre-aging time,the θ″ phases are formed. The number of the θ″ phases grows,and the strength increases sharply during the paint-bake treatment. In contrast with the 6000 series aluminum alloy for automobile body sheets,the paint-bake hardenability of the 2036 alloy is lower and its yield strength before the paint bake is accordingly higher,which will add the difficulty of forming for the sheet.展开更多
文摘The process characteristics of heat treatment of aluminum alloy auto body sheet and the working principle of air cushion furnace were introduced.The process position and irreplaceable role of air cushion furnace in the aluminum alloy auto body sheet production was pointed out after the difficulty and key points in the whole production process of auto body sheet were studied.Then the development process of air cushion furnace line of aluminum alloy sheet was reviewed,summarized and divided to two stages.Based on the research of air cushion furnace,the key technology of it was analyzed,then the key points on process,equipment and control models of air cushion furnace for aluminum alloy auto body sheet in future were put forward.With the rapid development of automotive industry,there will be certainly a new upsurge of research and application of air cushion furnace for heat treatment of aluminum alloy auto body sheet.
基金Projects (2005-12) supported by the State Key Laboratory of Advanced Design and Manufacture for Vehicle Body Open Foundation of China
文摘The effect of pre-aging treatment on the tensile properties,formability and microstructures of 2036 aluminum alloy for automobile body sheets were investigated through the tensile tests,DSC analysis and TEM observation. The results show that the alloy was softened,which was pre-aged at 180 ℃ within 20 min and then natural aging,namely T4P. However,the yield strength decreases first and then rises. The yield strength of the alloy after T4P(10 min) reach the minimal 202.3 MPa,but the elongation and strain hardening exponent arrive at the maximum,25.5% and 0.26 respectively,which can improve its formability effectively. In the early stage of T4P,GP zones dissolve,and generate some θ″ nuclei,so that the strengthening effect is restrained during the natural aging following the pre-aging. With the increment of pre-aging time,the θ″ phases are formed. The number of the θ″ phases grows,and the strength increases sharply during the paint-bake treatment. In contrast with the 6000 series aluminum alloy for automobile body sheets,the paint-bake hardenability of the 2036 alloy is lower and its yield strength before the paint bake is accordingly higher,which will add the difficulty of forming for the sheet.
