于秋颖,兰博,张敏聪,林莺莺,方爽,孙兴.初始晶粒度对GH720Li合金等温热变形组织演变的影响[J].稀有金属材料与工程,2020,49(4):1227~1234.[Qiuying Yu,Bo Lan,Mincong Zhang,Yingying Lin,Shuang Fang,Xing Sun.The Influence of initial grain sizes on microstructure evolution during hot deformation for GH720Li superalloy[J].Rare Metal Materials and Engineering,2020,49(4):1227~1234.]
初始晶粒度对GH720Li合金等温热变形组织演变的影响
投稿时间:2018-12-27  修订日期:2019-03-18
中文关键词:  GH720Li合金  晶粒度  热变形  显微组织  再结晶
基金项目:国家自然科学基金资助(项目号51404222)
中文摘要:
      对三种不同初始晶粒度的锻态GH720Li合金的等温热变形组织演变行为进行研究。结果表明,细于ASTM 6.5级的晶粒度是最终获得均匀细小热变形晶粒组织的关键临界初始组织条件,而初始ASTM 10级以上晶粒度合金具有较宽的热加工窗口。初始晶粒度对流变行为的影响非常明显,晶粒组织越粗大,合金的流变抗力越大。初始ASTM 3级合金热变形时不连续和连续动态再结晶都发挥重要作用,初始ASTM 6.5级合金热变形时以不连续动态再结晶为主,初始ASTM 10级合金热变形时除了动态再结晶,超塑性变形机制也起重要作用。进一步确定了初始ASTM 6.5和ASTM 10级晶粒度的合金获得均匀细晶组织的热加工区间。
The Influence of initial grain sizes on microstructure evolution during hot deformation for GH720Li superalloy
英文关键词:GH720Li alloy  grain size  hot deformation  microstructure  recrystallization
英文摘要:
      The microstructure evolution of wrought GH720Li alloy with three different initial grain sizes during isothermal hot deformation was studied. Grain size finer than ASTM 6.5 is considered to be the key critical initial condition for the final fine-grain grain structure, and a wider hot deformation window is found for the initial grain size with ASTM 10 or higher. The obvious effect of initial grain size on hot flow behavior is observed. The coarser the grain structure, the greater the hot flow behavior of the alloy. Discontinuous and continuous dynamic recrystallizations play important roles for the alloy with the initial ASTM 3 grain size The alloy with the initial grain size coarser than ASTM 6.5 are mainly subjected to discontinuous dynamic recrystallization. Dynamic recrystallization and superplastic deformation mechanism play important roles for the alloy with the initial ASTM 10 grain size. The hot working window of GH720Li alloys with ASTM 6.5 and ASTM 10 grain size was further determined for the final uniform fine grain structure.
作者单位E-mail
于秋颖 北京航空材料研究院 qiuyingyu@126.com 
兰博 北京航空材料研究院  
张敏聪 北京航空材料研究院  
林莺莺 北京航空材料研究院  
方爽 北京航空材料研究院  
孙兴 北京航空材料研究院  
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