辊底式淬火炉淬火工艺对7075铝合金板材力学性能及板形的影响  

Effect of quenching process of roller hearth furnace on mechanical properties and shape of 7075 aluminum alloy sheet

作　　者：覃秋慧 韦昌 陈小玲[1] 马英义 QIN Qiu-hui;WEI Chang;CHEN Xiao-ling;MA Ying-yi(Guangxi Alnan Aluminum Inc.,Nanning 530031,China;Guangxi Liu Zhou Yinhai Aluminum Co.,Ltd.,Liuzhou 545006,China)

机构地区：[1]广西南南铝加工有限公司,广西南宁530031 [2]广西柳州银海铝业股份有限公司,广西柳州545006

出　　处：《轻合金加工技术》2020年第9期27-32,共6页Light Alloy Fabrication Technology

基　　金：广西科技重大专项(桂科AA17204012);广西创新驱动发展专项资金项目(桂科AA17202007)。

摘　　要：为提高7075-T6铝合金板材(4 mm^7 mm厚)的力学性能,同时保证板材淬火后的板形,在实际大生产中调整辐底式淬火炉的淬火工艺参数,开发出高压区淬火工艺。试验结果表明:淬火冷却速度对7075铝合金时效后的力学性能的影响比固溶保温时间的大,因为高压区淬火后,板材转移时间缩短,冷却速度提高,因而室温时的过饱和固溶度增加,为时效做好了组织准备,最终明显提高了板材的力学性能。缩短保温时间后仍可保证板材力学性能控制在合理范围内。通过调节上下水压大小及上下压差,淬火后保证板材具有良好的板形。In order to improve the mechanical properties and guarantee the shape of 4 mm-7 mm thick sheet of 7075-T6 aluminum alloy,quenching parameters of roller hearth furnace were adjusted in practical production.As a result,a quenching process in the high pressure zone were developed.The results show that quench cooling rate has more influence on mechanical properties after aging than solution holding time does.After quenching in the high pressure zone,the transfer time is shortened,the cooling rate is increased,and the supersaturated solid solubility at room temperature is increased,which makes full preparation for aging in microstructure,and finally improves the mechanical properties of the sheet.The mechanical properties are still within a reasonable range after reducing holding time.Meanwhile,the shape is guaranteed by adjusting water pressures and their difference between top and bottom.

关 键 词：辊底式淬火炉 7075铝合金 淬火冷却速度 力学性能 板形 

分 类 号：TG166.3[金属学及工艺—热处理]