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金属学报  2014, Vol. 50 Issue (4): 463-470    DOI: 10.3724/SP.J.1037.2013.00404
  论文 本期目录 | 过刊浏览 |
激光立体成形GH4169合金再结晶过程中的界面和晶体取向演化*
刘奋成1), 林鑫2), 余小斌1), 黄春平1), 黄卫东2)
1) 南昌航空大学轻合金加工科学与技术国防重点学科实验室, 南昌 330063
2) 西北工业大学凝固技术国家重点实验室, 西安 710072
EVOLUTION OF INTERFACE AND CRYSTAL ORIENTATION OF LASER SOLID FORMED GH4169 SUPERALLOY DURING RECRYSTALLIZATION
LIU Fencheng 1), LIN Xin 2), YU Xiaobin 1), HUANG Chunping 1), HUANG Weidong 2)
1) National Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063
2) State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072
全文: PDF(4059 KB)   HTML
摘要: 

利用电子背散射衍射技术, 对激光立体成形GH4169镍基高温合金沉积态试样以及1100 ℃保温5和30 min水淬后试样的显微组织、晶界特点和晶体取向等进行了分析. 结果表明, 再结晶过程中随晶粒尺寸得到细化的同时, 各晶粒的晶体取向逐渐变得随机, 消除了沉积态材料中原本存在的各向异性, 合金的界面特点也发生变化, 大角度晶界数量逐渐增多, 且再结晶后期<111>60°孪晶界大量出现, 占总界面体积分数的44%, 孪晶的形成对激光立体成形GH4169合金的晶粒细化起了很重要的作用; 再结晶形核机制在再结晶初期以原始晶界的亚晶形核和晶界弓出机制为主, 孪晶相关的晶粒细化机制是再结晶后期晶粒细化的重要机制.

关键词 激光立体成形GH4169合金再结晶界面晶体取向    
Abstract:The dynamic-load mechanical of laser solid forming (LSF) GH4l69 Ni-based superalloy is influenced by the coarse columnar grains formed in LSF processing and then its application in jet engines like turbine disks is limited. The previous study showed that the grain structure of the LSF GH4l69 superalloy can be refined by recrystallization processing during post heat treatment. In this work, the microstructure, interface and crystal orientation of the as-deposited and heat treated LSF GH4169 superalloy samples were investigated by EBSD analysis. It was found that the crystal orientations of grains become more randomly organized as the grain structure of the LSF GH4169 superalloy was refined by heat treatment and the holding time of heat treatment was increased. Subsequently, microstructural anisotropy existed in the as-deposited samples was disappeared in the heat treated samples and the fraction of high angle grain boundary was increased greatly. < 111> 60° twin crystal boundary was presented during the later period of recrystallization and the volume fraction of the twin crystal boundary reached up to 44%. This indicated that the formation of twin crystal boundary during static recrystallization of LSF GH4169 samples played an important role in the refinement of grain structure. Sub-grain and grain-boundary migration nucleation were the main nucleation mechanisms at the beginning of the recrystallization and nucleation related to twin was one of the most important mechanisms in the later period of the recrystallization.
Key wordslaser solid forming    GH4169 superalloy    recrystallization    interface    crystal orientation
收稿日期: 2013-07-11     
ZTFLH:  TG146.4  
基金资助:*国家自然科学基金项目51201087和51165038, 江西省自然科学基金项目20132BAB216013, 西北工业大学凝固技术国家重点实验室开放基金项目SKLSP201306和SKLSP201225, 江西省教育厅科学技术研究项目GJJ13493, 南昌航空大学科研启动基金项目EA201203072资助
Corresponding author: LIU Fencheng, Tel: (0791)83863023, E-mail: fencheng999@163.com   
作者简介: 刘奋成, 男, 1981年生, 博士

引用本文:

刘奋成, 林鑫, 余小斌, 黄春平, 黄卫东. 激光立体成形GH4169合金再结晶过程中的界面和晶体取向演化*[J]. 金属学报, 2014, 50(4): 463-470.
LIU Fencheng ), LIN Xin ), YU Xiaobin ), HUANG Chunping ), HUANG Weidong ). EVOLUTION OF INTERFACE AND CRYSTAL ORIENTATION OF LASER SOLID FORMED GH4169 SUPERALLOY DURING RECRYSTALLIZATION. Acta Metall Sin, 2014, 50(4): 463-470.

链接本文:

https://www.ams.org.cn/CN/10.3724/SP.J.1037.2013.00404      或      https://www.ams.org.cn/CN/Y2014/V50/I4/463

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