单晶高温合金螺旋选晶器选晶行为的模拟和试验研究
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摘要
通过试验和模拟的方法分析了选晶器引晶段的晶粒组织演化规律和不同情况下等温线的形态分布,以及倾斜等温线下晶粒竞争生长的过程,同时研究了螺旋段的选晶行为。结果表明,引晶段的不同高度具有不同的组织形态,引晶段主要靠晶粒间的竞争生长作用优化晶粒取向,不同形态的等温线下晶粒的优先生长方向不同。螺旋段主要靠螺旋通道对枝晶生长的几何约束选择晶粒,确保只有一个晶粒进入型腔生长成为单晶组织。
The grain structure evolution of the starter block and morphology of the isotherm under different conditions were simulated and experimented as well as the process of grain growth under the inclined isotherm.And the grain selection behavior in spiral block was investigated.The results reveal that the different heights of the starter block present different structural morphology.The starter block mainly optimizes the grain orientation by the competition between grains,and the preferential growth directions of the grains under different isotherms are different.The spiral block mainly selects the grain by the geometric constraint of the spiral channel on the dendrite growth,ensuring that only one grain entering the cavity and growing into a single crystal structure.
The grain structure evolution of the starter block and morphology of the isotherm under different conditions were simulated and experimented as well as the process of grain growth under the inclined isotherm.And the grain selection behavior in spiral block was investigated.The results reveal that the different heights of the starter block present different structural morphology.The starter block mainly optimizes the grain orientation by the competition between grains,and the preferential growth directions of the grains under different isotherms are different.The spiral block mainly selects the grain by the geometric constraint of the spiral channel on the dendrite growth,ensuring that only one grain entering the cavity and growing into a single crystal structure.
引文
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[2]ZHANG X L,ZHOU Y Z,HAN Y Y.Dendritic growth pattern and dendritic network distortion in the platform of a Ni-based superalloy[J].Journal of Materials Science&Technology,2014,30(3):223-228.
[3]MENG X B,LI J G,JIN T.Evolution of grain selection in spiral selector during directional solidification of nickel-base superalloys[J].Journal of Materials Science&Technology,2011,27(2):118-126.
[4]REZAEI M,KERMANPUR A,SADEGHI F.Effects of withdrawal rate and starter block size on crystal orientation of a single crystal Ni-based superalloy[J].Journal of Crystal Growth,2018,485:19-27.
[5]马德新.高温合金叶片单晶凝固技术的新发展[J].金属学报,2015,51(10):1 179-1 190.
[6]LI C H,WEI C,ZHANG R L.Effects of directional solidification parameters and crystal selector on microstructure of single crystal of Ni-base superalloys[J].Journal of Central South University,2018,25(1):1-8.
[7]SZELIGA D P,KUBIAK K,MOTYKA M,et al.Directional solidification of Ni-based superalloy castings:Thermal analysis[J].Vacuum,2016,131,327-342.
[8]YANG C B,LIU L,NING L,et al.Orientation characteristics of single crystal superalloys with different preparation methods[J].Rare Metal Materials and Engineering,2017,46(4):912-916.
[9]WANG N,LIU L,GAO S F,et al.Simulation of grain selection during single crystal casting of a Ni-base superalloy[J].Journal of Alloys and Compounds,2014,586:220-229.
[10]ZHANG R L,CHEN L N,LI C H,et al.Influence of spiral crystal selector on crystal orientation of single crystal superalloy[J].Transactions of Nonferrous Metals Society of China,2012,22(5):1 092-1 095.
[11]张璞.CAFE模型模拟研究螺旋选晶器几何参数对选晶的影响[D].太原:中北大学,2016.
[12]王柠,刘林,高斯峰,等.镍基单晶高温合金螺旋选晶过程的数值模拟[J].稀有金属材料与工程,2013,42(12):2 558-2 562.
[13]崔锴,许庆彦,于靖,等.高温合金叶片定向凝固过程中辐射换热的计算[J].金属学报,2007,43(5):465-471.
[14]YANG X L,DONG H B,WANG W,et al.Microscale simulation of stray grain formation in investment cast turbine blades[J].Materials Science&Engineering,2004,A386(1):280-289.
[15]LI Y F,LIU L,HUANG T W,et al.Multi-scale characterization of stray grain in the platform of nickel-base single crystal turbine blade[J].Vacuum,2016,131:181-187.
[16]张航,许庆彦,孙长波,等.单晶高温合金螺旋选晶过程的数值模拟与实验研究Ⅰ·引晶段[J].金属学报,2013,49(12):1 508-1 520.
[17]张航,许庆彦,孙长波,等.单晶高温合金螺旋选晶过程的数值模拟与实验研究Ⅱ·螺旋段[J].金属学报,2013,49(12):1 521-1 531.