汽车用5182铝合金热变形行为及加工图研究
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摘要
在Gleeble-3800热模拟机上采用等温压缩实验研究了5182铝合金在变形温度为573 K～723 K、应变速率为0. 01 s-1～10 s~(-1)、真应变为0～0. 69条件下的高温流变应力行为,建立了5182铝合金热变形的本构方程和热加工图。结果表明:5182铝合金在热变形时,其流变应力呈现出稳态流变特征,随变形温度的升高而降低,随应变速率的增加而增大,但在应变速率ε·≥1 s~(-1)高应变速率下,则出现动态软化现象;可以采用包含Z参数的双曲正弦函数关系来描述5182铝合金高温变形时的流变应力行为;最佳的热变形区域为变形温度400℃～420℃、应变速率0. 01 s~(-1)～0. 1 s~(-1)。
The flow stress behavior of 5182 aluminum alloy under hot compression deformation,in the temperature range of 573 K-723 K,strain rates of 0. 01 s~(-1)-10 s~(-1) and true strains of 0-0. 69,was investigated by hot compression deformation with Gleeble-3800 thermal simulator. The constitutive equation and thermal processing diagram of thermal deformation of 5182 aluminum alloy were established. The result shows that when the 5182 aluminum alloy is hot deformed,its flow stress exhibits steady-state rheological characteristics,decreases with the increase of deformation temperature,and increases with the increase of strain rate. But at high strain rate ε·≥1 s~(-1),dynamic softening occurs. The hyperbolic sinusoidal function relationship with Z parameters can be used to describe the flow stress behavior of 5182 aluminum alloy during high temperature deformation. The best thermal deformation region is at deformation temperature 400℃-420℃ C and strain rate 0. 01 s~(-1)-0. 1 s~(-1).
The flow stress behavior of 5182 aluminum alloy under hot compression deformation,in the temperature range of 573 K-723 K,strain rates of 0. 01 s~(-1)-10 s~(-1) and true strains of 0-0. 69,was investigated by hot compression deformation with Gleeble-3800 thermal simulator. The constitutive equation and thermal processing diagram of thermal deformation of 5182 aluminum alloy were established. The result shows that when the 5182 aluminum alloy is hot deformed,its flow stress exhibits steady-state rheological characteristics,decreases with the increase of deformation temperature,and increases with the increase of strain rate. But at high strain rate ε·≥1 s~(-1),dynamic softening occurs. The hyperbolic sinusoidal function relationship with Z parameters can be used to describe the flow stress behavior of 5182 aluminum alloy during high temperature deformation. The best thermal deformation region is at deformation temperature 400℃-420℃ C and strain rate 0. 01 s~(-1)-0. 1 s~(-1).
引文
[1]林启权,张辉,彭大暑,等.5182铝合金热压缩变形流变应力[J].湘潭大学自然科学学报,2002,24(3):84-88.
[2]李娜,王宁.拉环用5182铝合金扁铸锭热轧流变分析[J].有色金属加工,2012,41(6):18-21.
[3]孟繁平.5182合金成分优化研究[J].铝加工,2015,(3):30-34.
[4]王孟君,周威,任杰,等.汽车用5182铝合金的温拉伸成形性能[J].中南大学学报,2010,41(3):936-939.
[5]单云,吴斌.AA5182-O铝合金成形性能的研究[J].南昌大学学报,2015,37(1);52-55.
[6]吴凯,韩维群,张铁军,等.2A12铝合金的热压缩行为及热加工图[J].金属热处理,2017,42(4):12-17.
[7]金滨辉.汽车车身用5182铝合金板组织与性能研究[D].北京有色金属研究总院,2013.
[8]YOUNGBUM L,HYUKSHIN D,KYUNG P,et al.Effect of annealing temperature on microstructures and mechanical properties of a 5083 Al alloy deformed at cryogenic temperature[J].Srcipta mteralia,2004,51:355-359.
[9]WU B,LI M Q,MA D W.The flow behavior and constitutive equations in isothermal compression of 7050aluminum alloy[J].Materials Science and Engineering A,2012,542:79-87.
[10]GRONOSTAJSKI Z.The constitutive equations for FEM analysis[J].Journal of Materials Processing Technology,2000,106:40-44.
[11]晏井利,孙扬善,薛烽,等.纯Mg的蠕变行为研究[J].金属学报,2008,44(11):1354.
[2]李娜,王宁.拉环用5182铝合金扁铸锭热轧流变分析[J].有色金属加工,2012,41(6):18-21.
[3]孟繁平.5182合金成分优化研究[J].铝加工,2015,(3):30-34.
[4]王孟君,周威,任杰,等.汽车用5182铝合金的温拉伸成形性能[J].中南大学学报,2010,41(3):936-939.
[5]单云,吴斌.AA5182-O铝合金成形性能的研究[J].南昌大学学报,2015,37(1);52-55.
[6]吴凯,韩维群,张铁军,等.2A12铝合金的热压缩行为及热加工图[J].金属热处理,2017,42(4):12-17.
[7]金滨辉.汽车车身用5182铝合金板组织与性能研究[D].北京有色金属研究总院,2013.
[8]YOUNGBUM L,HYUKSHIN D,KYUNG P,et al.Effect of annealing temperature on microstructures and mechanical properties of a 5083 Al alloy deformed at cryogenic temperature[J].Srcipta mteralia,2004,51:355-359.
[9]WU B,LI M Q,MA D W.The flow behavior and constitutive equations in isothermal compression of 7050aluminum alloy[J].Materials Science and Engineering A,2012,542:79-87.
[10]GRONOSTAJSKI Z.The constitutive equations for FEM analysis[J].Journal of Materials Processing Technology,2000,106:40-44.
[11]晏井利,孙扬善,薛烽,等.纯Mg的蠕变行为研究[J].金属学报,2008,44(11):1354.