王 悦,许文勇,刘 娜,郑 亮,袁 华,李 周,张国庆.喷射成形GH738合金热变形特性及微观组织演变[J].稀有金属材料与工程,2018,47(3):878~883.[Wang Yue,Xu Wenyong,Liu Na,Zheng Liang,Yuan Hua,Li Zhou,Zhang Guoqing.Deformation Characteristic and Microstructure Evolution of Spray Formed GH738[J].Rare Metal Materials and Engineering,2018,47(3):878~883.]
喷射成形GH738合金热变形特性及微观组织演变
投稿时间:2016-02-24  修订日期:2016-06-20
中文关键词:  高温合金  GH738  喷射成形  热变形本构方程  动态再结晶
基金项目:国家973计划(2010CB631205);国家自然科学基金(51304177);国家科技支撑计划资助(2015BAE03B01)
中文摘要:
      在温度950~1200℃、应变速率0.13~6.5s-1及工程应变50%的条件下,利用Gleeble-3500TM热模拟试验机对喷射成形GH738合金进行热压缩试验,研究了合金的热流变行为并建立了流变本构关系,结合显微组织分析及统计技术研究了合金的组织演变情况。结果表明,流变应力随温度的升高和应变速率的减小而降低。合金热变形激活能为580.81kjmol-1。随着形变温度的升高,高位错密度处晶界弓出形核使晶界“锯齿”化并形成项链组织,在1100℃获得完全动态再结晶组织,随温度继续升高及应变速率的降低组织明显长大。
Deformation Characteristic and Microstructure Evolution of Spray Formed GH738
英文关键词:superalloy  GH738  spray forming  constitutive model  DRX
英文摘要:
      The hot flow behaviors and deformation model of spray formed superalloy GH738 were investigated using Gleeble-3500TM simulator at the temperature range of 950~1200℃, strain rate range of 0.13~6.5s-1 and reduction of 50%. The evolution of microstructure was studied by microscope and image analysis system. The results show that the flow stress decrease with increasing deformation temperature or decreasing strain rate. The hot deformation activation energy Q is 580.81kjmol-1. As the temperature increase, the necklace structures are obtained along the boundaries which are protuberated by the new recrystallized grains in the high dislocation-density serrated grain boundary zones. The structures show fully dynamic recrystallization characteristic at the temperature of 1100℃ while the higher temperature and the low strain rate forced the structure grown.
作者单位E-mail
王 悦 北京航空材料研究院先进高温结构材料重点实验室 kurt_hit@163.com 
许文勇 北京航空材料研究院先进高温结构材料重点实验室  
刘 娜 北京航空材料研究院先进高温结构材料重点实验室  
郑 亮 北京航空材料研究院先进高温结构材料重点实验室  
袁 华 北京航空材料研究院先进高温结构材料重点实验室  
李 周 北京航空材料研究院先进高温结构材料重点实验室  
张国庆 北京航空材料研究院先进高温结构材料重点实验室  
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