凝固应力法测试铸造铝硅合金枝晶搭接点研究
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摘要
以Al-Si-Mg合金为研究对象,采用双热电偶法和动态凝固应力测试法测试Al-Si-Mg合金的枝晶搭接点温度。结果表明,采用双热电偶法测得Al-Si-Mg合金枝晶搭接点温度为603.8℃,采用动态凝固应力法测得粗杆和细杆中Al-7Si-0.5Mg合金枝晶搭接点温度分别为615.2℃和607.6℃,两种方法测得结果基本一致。因此,动态凝固应力法测试铸造合金枝晶搭接点是可行的。
The dendrite coherency point of Al-Si-Mg alloy was tested by double thermocouples method and dynamic solidifying stress method.The results show that the temperature of dendrite coherency point is 603.8 ℃ by double thermocouples method,measured dynamic stress method of solidification thick and thin rods of Al-Si7-0.5 Mg alloy dendrite take contact temperature of 615.2 ℃ and 607.6 ℃,respectively.The results of the two methods are basically consistent.Therefore,the dynamic solidification stress method is feasible to test the casting alloy dendrite coherency point.
The dendrite coherency point of Al-Si-Mg alloy was tested by double thermocouples method and dynamic solidifying stress method.The results show that the temperature of dendrite coherency point is 603.8 ℃ by double thermocouples method,measured dynamic stress method of solidification thick and thin rods of Al-Si7-0.5 Mg alloy dendrite take contact temperature of 615.2 ℃ and 607.6 ℃,respectively.The results of the two methods are basically consistent.Therefore,the dynamic solidification stress method is feasible to test the casting alloy dendrite coherency point.
引文
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[23]Chen Rui,Shi Yu-feng,Xu Qing-yan,et al.Effect of cooling rate on solidification parameters and microstructure of Al-7Si-0.3Mg-0.15Fe alloy[J].Transactions of Nonferrous Metals Society of China,2014,24:1645-1652.
[2]姜云峰,廖恒成,孙国雄,等.Sr对Al-13%Si合金共晶凝固冷却曲线特征温度的影响[J].铸造,2006,55(10):933-936.
[3]Shabestari S G,Ghoncheh M H.Investigation on the Effect of Cooling Rate on Hot Tearing Susceptibility of Al2024 Alloy Using Thermal Analysis[J].Metallurgical and Materials Transactions B2015,46(6):2438-2448.
[4]Dahle A K,Tondel P A,Paradies C J,et al.Effect of Grain Refinement on the Fluidity of Two Commercial Al-Si Foundry Alloys[J]Metallurgical and Materials Transactions A,1996,27:2305-2313
[5]Farahany S,Idris M H,Ourdjini A,et al.Evaluation of the effect of grain refiners on the solidification characteristics of an Sr-modified ADC12 die-casting alloy by cooling curve thermal analysis[J]Journal of Thermal Analysis and Calorimetry,2015,119:1593-1601.
[6]Malekan M,Naghdali S,Abrishami S,et al.Effect of cooling rate on the solidification characteristics and dendrite coherency point of ADC12 aluminum die casting alloy using thermal analysis[J]Journal of Thermal Analysis and Calorimetry,2016,124:601-609
[7]Veldman NLM,Dahle AK,Stjohn DH,et al.Dendrite coherency of Al-Si-Cu alloys[J].Metallurgical and Materials Transactions A2001,32(1):147-155.
[8]李建峰,李金山,寇宏超,等.熔体处理对A357合金枝晶搭接点的影响[J].中国有色金属学报,2006,16(3):470-475.
[9]王英杰,贾泮江,姚惟斌.铸造铝合金热分析技术研究[J].航空材料学报,2000,20(3):44-48.
[10]Stangeland A,Asbj rn M O,yvind Nielsen,et al.Development of thermal strain in the coherent mushy zone during solidification of aluminum alloys[J].Metallurgical and Materials Transactions A2004,35(9):2903-2915.
[11]Djurdjevic M B,Sokolowski J H,Odanovic Z.Determination of dendrite coherency point characteristics using first derivative curve versus temperature[J].Journal of Thermal Analysis and Calorimetry,2012,109(2):875-882.
[12]Ahmad R,Asmael MBA.Influence of Lanthanum on Solidification,Microstructure,and Mechanical Properties of Eutectic Al-Si Piston Alloy[J].JMEPEG,2016,25:2799-2813.
[13]MALEKAN M,SHABESTARI SG.Effect of Grain Refinement on the Dendrite Coherency Point during Solidification of the A319 A-luminum Alloy[J].Metallurgical and Materials Transactions A,2009,40:3196-3203.
[14]CAO G,KOU S.Hot Tearing of Ternary Mg-Al-Ca Alloy Castings[J].Metallurgical and Materials Transactions A,2006,37:3647-3663.
[15]肖柯则,宝音.应力框中动态应力的研究[J].铸造,1981,30(4):12-15.
[16]张家锋,康进武,柳百成.铸件凝固过程的应力动态测量方法[J].铸造,2007,56(9):960-962.
[17]钟鼓,吴永福,邹纯,等.挤压铸造高强韧AlSiMgMn合金的组织和性能[J].特种铸造及有色合金,2017,37(12):1277-1282.
[18]赵国荣,蒋文明,樊自田.浇注温度和机械振动对消失模型壳铸造ZL101A合金组织性能的影响[J].特种铸造及有色合金,2018,38(2):186-189.
[19]王强,李言祥.热分析在Al-Si合金熔体细化及变质效果测评方面的应用[J].材料科学与工艺,2001,9(2):215-218.
[20]安阁英.铸件形成理论[M].北京:机械工业出版社,1990.
[21]Djurdjevic M B,Huber G,Odanovic Z.Synergy between thermal analysis and simulation[J].Journal of Thermal Analysis and Calorimetry,2013,111(2):1365-1373.
[22]Xu Rongfu,Zheng Hongliang,Guo Fengxiang,et al.Effect of Silicon Concentration on the Dendrite Coherency Point in Al-Si Binary Alloys[J].Transactions of the Indian Institute of Metals,2014,67(1):95-100.
[23]Chen Rui,Shi Yu-feng,Xu Qing-yan,et al.Effect of cooling rate on solidification parameters and microstructure of Al-7Si-0.3Mg-0.15Fe alloy[J].Transactions of Nonferrous Metals Society of China,2014,24:1645-1652.