定向凝固工艺对DZ466高温合金显微组织的影响
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摘要
研究凝固工艺(抽拉速率、模壳保温温度)对DZ466合金铸态组织的影响。结果表明:定向凝固过程中,随着抽拉速率的增加或型壳温度的升高,一次枝晶间距逐渐减小,γ′相尺寸减小,碳化物尺寸减小;随着抽拉的进行,散热效率下降,一次枝晶间距增大,γ′相尺寸增大;在1520℃/1530℃的壳温下,以8 mm/min的速率抽拉,可以获得细小的枝晶组织和γ′相组织,有利于提高合金的性能。
The influences of withdrawal rate and mold heater zone temperature during high rate solidification(HRS) on the microstructures were investigated. As the results, the primary dendritic spacing, the size of γ′ phase particles and carbides are decreased with the increase of the withdrawal rate or mold heater zone temperature. As the withdrawing goes on, the primary dendritic spacing and the size of γ′ phase particles are increased, and the heat emission efficiency of HRS process is decreased.The results show that fine dendrite and γ′ phase can be achieved with the withdrawal of 8 mm/min and mold heater zone temperature of 1520 ℃/1530 ℃, which is benefit to improve the properties of DZ466 alloy.
The influences of withdrawal rate and mold heater zone temperature during high rate solidification(HRS) on the microstructures were investigated. As the results, the primary dendritic spacing, the size of γ′ phase particles and carbides are decreased with the increase of the withdrawal rate or mold heater zone temperature. As the withdrawing goes on, the primary dendritic spacing and the size of γ′ phase particles are increased, and the heat emission efficiency of HRS process is decreased.The results show that fine dendrite and γ′ phase can be achieved with the withdrawal of 8 mm/min and mold heater zone temperature of 1520 ℃/1530 ℃, which is benefit to improve the properties of DZ466 alloy.
引文
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[10]张剑,骆宇时,赵云松,等.一种低密度镍基单晶高温合金的组织与性能研究[J].航空材料学报,2011,31(增刊1):90-93.(ZHANG J,LUO Y S,ZHAO Y S,et al.The research of microstructure and property of a low density nikel base single crystal[J].Journal of Aeronautical Materials,2011,31(Suppl 1):90-93.)
[11]WHITESELL H S,OVERFELT R A.Influence of solidification variables on the microstructure,macrosegregation,and porosity of directionally solidified Mar-M247[J].Materials Science and Engineering:A,2001,318(1/2):264-276.
[12]ZHANG J,LU J G,JIN T,et al.Effect of solidification parameters on the microstructure and creep property of a single crystal Ni-base superalloy[J].Journal of Materials Science and Technology,2010,26(10):889-894.
[13]肖旋,高慈,秦学智,等.抽拉速率对定向凝固DZ483合金的微观组织及力学性能的影响[J].中国有色金属学报,2013,23(10):2808-2816.(XIAO X,GAO C,QIN X Z,et al.Effects of withdrawal rate on microstructures and mechanical properties of directionally solidified DZ483 superalloy[J].The Chinese Journal of Nonferrous Metals,2013,23(10):2808-2816.)
[2]史麟观.对世界先进船用燃气轮机的认识与展望[J].国外舰船工程,2002(1):18-24.(SHI L G.The understanding and outlook of the world advanced marine gas turbine[J].International Ship Engineering,2002(1):18-24.)
[3]郭建亭.高温合金材料学(上册)[M].北京:科学出版社,2008:3-16.(GUO J T.Materials science and engineering for superalloys(I)[M].Beijing:Science Press,2008:3-16.)
[4]葛丙明,刘林,张胜霞,等.抽拉速率对定向凝固叶片状DZ125高温合金微观组织的影响[J].金属学报,2011,47(11):1470-1476.(GE B M,LIU L,ZHANG S X,et al.Influence of withdrawal rate on microstructures of blade solidified DZ125superalloy[J].Acta Metallurgical Sinica,2011,47(11):1470-1476.)
[5]熊继春,李嘉荣,韩梅,等.浇注温度对DD6单晶高温合金凝固组织的影响[J].材料工程,2009(2):43-46.(XIONG J C,LI J R,HAN M,et al.Effects of pouring temperature on the solidification microstructure of single crystal superalloy DD6[J].Journal of Materials Engineering,2009(2):43-46.)
[6]葛丙明,刘林,张军,等.凝固参数对DZ125合金叶片类试棒微观组织和性能的影响[J].稀有金属材料与工程,2012,41(5):840-846.(GE B M,LIU L,ZHANG J,et al.Influence of solidification parameters on the microstructure and properties of DZ125 superalloy castings[J].Rare Metal Materials and Engineering,2012,41(5):840-846.)
[7]刘忠元,李建国,傅恒志.凝固速率对定向凝固合金DZ22技晶臂间距和枝晶偏析的影响[J].金属学报,1995,31(7):329-332.(LIU Z Y,LI J G,FU H Z.Dendritic arm of spacing and microsegregation of directionally solidified superalloyDZ22 at various solidification rates[J].Acta Metallurgical Sinica,1995,31(7):329-332.)
[8]SHENG L Y,GUO J T,TIAN Y X,et al.Microstructure and mechanical properties of rapidly solidified Ni AlCr(Mo)eutectic alloy doped with trace Dy[J].Journal of Alloys and Compounds,2009,475(1/2):730-734.
[9]刘维维,唐定中.抽拉速率对DD6单晶高温合金凝固组织的影响[J].材料工程,2006(1):16-18.(LIU W W,TANG D Z.Effect of withdrawing rate on solidification microstructure of single crystal superalloy DD6[J].Journal of Materials Engineering,2006(1):16-18.)
[10]张剑,骆宇时,赵云松,等.一种低密度镍基单晶高温合金的组织与性能研究[J].航空材料学报,2011,31(增刊1):90-93.(ZHANG J,LUO Y S,ZHAO Y S,et al.The research of microstructure and property of a low density nikel base single crystal[J].Journal of Aeronautical Materials,2011,31(Suppl 1):90-93.)
[11]WHITESELL H S,OVERFELT R A.Influence of solidification variables on the microstructure,macrosegregation,and porosity of directionally solidified Mar-M247[J].Materials Science and Engineering:A,2001,318(1/2):264-276.
[12]ZHANG J,LU J G,JIN T,et al.Effect of solidification parameters on the microstructure and creep property of a single crystal Ni-base superalloy[J].Journal of Materials Science and Technology,2010,26(10):889-894.
[13]肖旋,高慈,秦学智,等.抽拉速率对定向凝固DZ483合金的微观组织及力学性能的影响[J].中国有色金属学报,2013,23(10):2808-2816.(XIAO X,GAO C,QIN X Z,et al.Effects of withdrawal rate on microstructures and mechanical properties of directionally solidified DZ483 superalloy[J].The Chinese Journal of Nonferrous Metals,2013,23(10):2808-2816.)
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