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陈仕奇,逯峙,王广欣.气雾化镍基高温合金粉体的过冷度和显微组织特征[J].稀有金属材料与工程(英文),2018,47(12):3604~3609.[Shiqi Chen,Zhi Lu and Guangxin Wang.Undercooling and Microstructure of Gas Atomized Ni-based Superalloy Powders[J].Rare Metal Materials and Engineering,2018,47(12):3604~3609.]
Undercooling and Microstructure of Gas Atomized Ni-based Superalloy Powders
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Received:April 28, 2017  Revised:July 14, 2017
Key words: Atomization  Powder  Undercooling  Ni-based alloy
Foundation item:国家自然科学基金项目,河南省教育厅项目
Author NameAffiliation
Shiqi Chen,Zhi Lu and Guangxin Wang  
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      Atomization is an effective approach to obtain fine and spherical alloy powders. Undercooling is a important factor that can affect the property of powders during atomization. In this paper, the effects of powder size and cooling rate on the undercooling and microstructure of powders were investigated in the paper, and the relation between powder size, cooling rate and the undercooling was obtain through DSC. The result show that a small powder size and a low cooling rate will result in a large undercooling. Meanwhile, it was found that when the undercooling is large, the dendrite arm spacing of particles decrease. The smaller the powder size, the proportion of cellular grains increase, and the grain size of the powders will be even fine.