半固态6061合金流变铸-锻成形及组织均匀性
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摘要
采用分析软件测定了6061合金的冷却曲线,并对不同温度下合金的初生固相率进行了测试。利用H1F100型伺服驱动压力机及杯型试验模具,进行了半固态6061合金流变铸-锻成形,研究了合金温度、成形压力、上型温度、保持时间等工艺参数对半固态6061合金成形性的影响,探讨了工艺参数及热处理对半固态6061合金流变铸-锻成形件组织均匀性的影响。结果表明,在一套模具内,完成半固态铸造和半固态锻造即半固态铸-锻成形是可行的;合金温度在645℃,上型温度为300℃,下型温度为350℃,成形比压为105 MPa,保持时间为0~4s时,可得到组织均匀的试件。
The cooling curve of 6061 alloy was determined by analysis software,and primary solid fraction was tested at different temperatures.Using H1F100 servo press and cup type test mold,the 6061 semisolid alloy rheological casting-forging forming was carried out.Influences of parameters,such as alloy temperature,forming pressure,upper mould temperature,holding time,on the formability of semi-solid 6061 alloy were researched.The influences of technological parameters and heat treatment on microstructure uniformity of rheological casting-forging semi-solid 6061 alloy were discussed.The results show that,the semi-solid casting and semi-solid forging as well semi-solid casting-forging are feasible within a set of mold.The uniform microstructure in the alloy can be obtained at 645℃,the upper mould temperature of 300 ℃,the down mould temperature of 350 ℃,forming specific pressure of 105 MPa,and duration 0sto 4s.
The cooling curve of 6061 alloy was determined by analysis software,and primary solid fraction was tested at different temperatures.Using H1F100 servo press and cup type test mold,the 6061 semisolid alloy rheological casting-forging forming was carried out.Influences of parameters,such as alloy temperature,forming pressure,upper mould temperature,holding time,on the formability of semi-solid 6061 alloy were researched.The influences of technological parameters and heat treatment on microstructure uniformity of rheological casting-forging semi-solid 6061 alloy were discussed.The results show that,the semi-solid casting and semi-solid forging as well semi-solid casting-forging are feasible within a set of mold.The uniform microstructure in the alloy can be obtained at 645℃,the upper mould temperature of 300 ℃,the down mould temperature of 350 ℃,forming specific pressure of 105 MPa,and duration 0sto 4s.
引文
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[3]LL T,FRIEDRICH B,HUFSCHMIDT M,et al.Evaluation and modelling of chemical segregation effects for thixoforming processing[J].Adv.Eng.Mater.,2003,5(3):156-160.
[4]KANG C G,JUNGIALS H K.A study on solutions for avoiding liquid segregation phemena in thixoforming process:Part I.Constitutive modelling and finite element method simulations for die design[J].Metall.Mater.Trans.,2001,B32(1):119-127.
[5]HUFSCHMIDT M,MODIGELL M,PETERA J.Modelling and simulation of forming processes of metallic suspensions under n-isothermal conditions[J].Journal of Newtonian Fluid Mechanics,2006,134(1-3):16-26.
[6]SEO P K,KIM D U,KANG C G.The effect of the gate shape on the microstructural characteristic of the grain size of Al-Si alloy in the semi-solid die casting process[J].Mater.Sci.Eng.,2007,A445-446:20-30.
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