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王建国,刘东,王海平,杨艳慧,付宝全,杜刚,王新.GH4169合金晶界δ相析出的动力学分析[J].稀有金属材料与工程(英文),2019,48(4):1148~1154.[Wang Jian Guo,LIU Dong,WANG Haiping,YANG Yanhui,FU Baoquan,DU Gang and WANG Xin.Kinetics of δ phases precipitated at grain boundaries during aging of GH4169 superalloy[J].Rare Metal Materials and Engineering,2019,48(4):1148~1154.]
Kinetics of δ phases precipitated at grain boundaries during aging of GH4169 superalloy
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Received:September 07, 2017  Revised:October 30, 2017
DOI:
Key words: GH4169 alloy, δ phase morphology, grain boundary curvature,
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目)
Author NameAffiliation
Wang Jian Guo,LIU Dong,WANG Haiping,YANG Yanhui,FU Baoquan,DU Gang and WANG Xin  
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Abstract:
      GH4169 alloy is a Ni-Fe based superalloy which is used as the critical component in areoengine. The evolution of δ phase has highly influence on the hot working process, microstructure evolution and performance. In this paper, GH4169 alloy which are solution treated and deformed at high temperature were conducted on aging treatment to investigate the morphology and precipitation mechanisms of δ phases. The volume fraction of δ phases increases with the Nb element content. The peak temperature for δ phases precipitation is 920℃ which is not influenced by the content of Nb element. The nucleation rate and volume fraction of δ phases increases with the decreasing of average grain size. Otherwise, the size of δ phases decreasing with average grain size. Low angle grain boundaries within grains promote the precipitation of δ phases intergranular. The critical barrier and critical radius decreases with the radius of vurvature. Otherwise, the nucleation rate of δ phases increases with the increasing of curvature. The distribution morphologies of δ phases precipitated at grain boundary are similar to needles, sawtoothes and fish tails.