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,2019,48(4):1148~1154.[Wang Jian Guo,LIU Dong,WANG Haiping,YANG Yanhui,FU Baoquan,DU Gang,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.]
GH4169合金晶界δ相析出的动力学分析
投稿时间:2017-09-07  修订日期:2017-10-30
中文关键词:  GH4169合金,δ相形貌,晶界曲率,
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:
      通过对固溶态及变形态GH4169合金进行时效处理,采用SEM技术研究Nb元素含量、晶界曲率对合金中δ相体积分数及尺寸的影响,讨论了δ相在弯曲界面析出的动力学规律。结果表明:GH4169合金中δ相析出的体积分数随Nb元素含量的增加而增加,δ相析出的峰值温度为920℃且受Nb元素含量的影响较小。随试样平均晶粒尺寸的降低,δ相的形核率和体积分数增加,尺寸降低。小角度晶界可有效促进δ相在晶粒内部析出。随晶界曲率半径的降低,δ相形核的临界势垒和临界半径降低,晶界δ相的形核率增加。在晶界析出δ相分别呈长针状、锯齿状及鱼尾状分布。
Kinetics of δ phases precipitated at grain boundaries during aging of GH4169 superalloy
英文关键词:GH4169 alloy, δ phase morphology, grain boundary curvature,
英文摘要:
      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.
作者单位E-mail
王建国 西北工业大学材料学院 wjgnll@126.com 
刘东 西北工业大学材料学院  
王海平 西北工业大学材料学院  
杨艳慧 西北工业大学材料学院  
付宝全 西部超导材料科技股份有限公司  
杜刚 西部超导材料科技股份有限公司  
王新 山东泰山钢铁集团有限公司  
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