两道次成形过程中拉伸速度及热处理对2A12-O铝合金晶粒尺寸的影响
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摘要
目的研究铝合金2A12材料在两道次变形过程中拉伸量、拉伸速度及热处理参数对材料晶粒尺寸的影响规律。方法进行了2A12-O铝合金板的"预拉伸-退火-再拉伸-淬火"两道次成形过程。当两次拉伸量相等,总拉伸量不大于20%时,研究了拉伸速度、退火温度、淬火保温时间与试验后晶粒尺寸的关系。结果在拉伸总量较小的情况下,拉伸速度和各热处理参数对材料最终晶粒尺寸的影响较大;当拉伸总量增大到某临界值时,拉伸速度和热处理参数的影响明显减小,各参数下的晶粒尺寸在总拉伸量相同的情况下趋于一致。结论获得了拉伸总量、拉伸速度、退火温度和淬火保温时间等成形及热处理参数对2A12-O铝合金板材晶粒尺寸的影响规律,为该材料成形及热处理过程中的晶粒尺寸控制提供了依据。
The paper aims to study the effects of tensile amount, tensile speed and heat treatment parameters on the grain size of 2 A12 aluminium alloy during two-step deformation. Through the two-step forming process of prestretching-annealing-poststretching-quenching, the relationship between the grain size and the parameters of tensile speed, annealing temperature, holding time of quenching was studied when the tensile amounts of the two deforming steps were equal and the total tensile amount was not more than 20%. When the total tensile amount was small, the tensile speed and heat treatment parameters had great influence on the final grain size of the material. And when the total tensile amount was increased to a certain critical value, the influence of the parameters was obviously reduced, and the grain size under each parameter tended to be the same when the total tensile amount was the same. The effects of forming and heat treatment parameters on the grain size of 2 A12-O aluminum alloy sheet are obtained. It provides a basis for grain size control of aluminium alloy sheet during forming and heat treatment.
The paper aims to study the effects of tensile amount, tensile speed and heat treatment parameters on the grain size of 2 A12 aluminium alloy during two-step deformation. Through the two-step forming process of prestretching-annealing-poststretching-quenching, the relationship between the grain size and the parameters of tensile speed, annealing temperature, holding time of quenching was studied when the tensile amounts of the two deforming steps were equal and the total tensile amount was not more than 20%. When the total tensile amount was small, the tensile speed and heat treatment parameters had great influence on the final grain size of the material. And when the total tensile amount was increased to a certain critical value, the influence of the parameters was obviously reduced, and the grain size under each parameter tended to be the same when the total tensile amount was the same. The effects of forming and heat treatment parameters on the grain size of 2 A12-O aluminum alloy sheet are obtained. It provides a basis for grain size control of aluminium alloy sheet during forming and heat treatment.
引文
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[3]王昆,万敏,华程,等.铝合金拉形粗晶临界预应变曲线的建立及应用[J].北京航空航天大学学报,2013,39(4):508-511.WANG Kun,WAN Min,HUA Cheng,et al.Determination and Application of Coarse-grain Critical Pre-strain Curve to Aluminum Alloy Stretch Forming[J].Journal of Beijing University of Aeronautics and Astronautics,2013,39(4):508-511.
[4]李小强,李东升,周贤宾,等.预变形对LY12铝合金板热处理后晶粒度的影响[J].材料科学与工艺,2010,18(2):238-241.LI Xiao-qiang,LI Dong-sheng,ZHOU Xian-bin,et al.Effect of Predeformation on the Grain Size of LY12Aluminum Alloy Sheet after Heat Treatment[J].Materials Science and Technology,2010,18(2):238-241.
[5]龙江.Al6061板材冷轧与再结晶退火试验研究及材料微观参数对表面粗糙度演变的影响[D].重庆:重庆大学,2016.LONG Jiang.Experimental Study of Cold Rolling and Recrystallization Annealing for Al6061 Sheet and the Influence of Microscopic Material Parameters on the Surface Roughness Evolution[D].Chongqing:Chongqing University,2016.
[6]李丁,刘旭东.蒙皮零件拉伸粗晶的控制研究[J].航空制造技术,2011(18):81-83.LI Ding,LIU Xu-dong.Research of Controlling Coarse-Grain of Stretching Skin Part[J].Aeronautical Manufacturing Technology,2011(18):81-83.
[7]游中厚,黄勇胜,吴瑞豪.改善飞机前侧壁蒙皮表面橘皮研究[J].航空工程与维修,2001(6):46-47.YOU Zhong-hou,HUANG Yong-sheng,WU Rui-hao.AStudy of Orange-like Routhness on Front Side on Airplane[J].Aviation Engineering&Maintenance,2001(6):46-47.
[8]李念奎,凌杲,聂波.铝合金材料及其热处理技术[M].北京:冶金工业出版社,2012.LI Nian-kui,LING Gao,NIE Bo.Aluminum Alloy and the Heat Treatment Technology[M].Beijing:Metallurgical Industry Press,2012.
[9]SUN Z C,YIN J L,YANG H.Microstructure Evolution and Microhardness of 7075 Aluminum Alloy during Heat Treatment by Considering Hot Deformation History[J].Advanced Materials Research,2013,699:851-858.
[10]刘义伦,羿九火,杨大炼,等.固溶温度对7075铝合金组织及高周疲劳性能的影响[J].金属热处理,2016,41(3):1-7.LIU Yi-lun,YI Jiu-huo,YANG Da-lian,et al.Effects of Solution Temperature on Microstructure and High Cycle Fatigue Performance of 7075 Aluminum Alloy[J].Heat Treatment of Metals,2016,41(3):1-7.
[11]郑欣.退火温度对Al-4.2Cu-1.4Mg合金的微观结构和力学性能的影响[J].金属热处理,2012,37(11):99-102.ZHENG Xin.Effect of Annealing Temperature on Microstructure and Mechanical Properties of Al-4.2Cu-1.4Mg Aluminum Alloy[J].Treatment of Metals,2012,37(11):99-102.
[12]马冬威,王敏,胡志华.固溶处理对7A09铝合金组织和力学性能的影响[J].金属热处理,2014(1):38-41.MA Dong-wei,WANG Min,HU Zhi-hua.Effects of Solid Solution Treatment on Microstructure and Mechanical Properties of 7A09 Aluminum Alloy[J].Heat Treatment of Metals,2014(1):38-41.
[13]毛卫民,赵新兵.金属的再结晶与晶粒长大[M].北京:冶金工业出版社,1994.MAO Wei-min,ZHAO Xin-bing.Recrystallizing and Grain Growth of Metals[M].Beijing:Metallurgical Industry Press,1994.