制备热历程对GH4742合金涡轮盘组织性能的影响
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- 英文论文题名：Effects of Prior Thermal History on Microstructure and Mechanical Properties of GH4742 Turbine Discs
- 论文作者：张文云 ; 张北江 ; 陈石富 ; 秦鹤勇 ; 胥国华 ; 赵光普
- 英文论文作者：Zhang Wenyun ; Zhang Beijiang ; Chen Shifu ; Qin Heyong ; Xu Guohua ; Zhao Guangpu ; High Temperature Materials Research Division ; Central Iron & Steel Research Institute
- 年：2015
- 作者机构：钢铁研究总院高温材料研究所;
- 论文关键词：镍基高温合金 ; 热历程 ; 不连续沉淀 ; 微观组织 ; 力学性能
- 英文论文关键词：Ni-base superalloy ; thermal history ; discontinuous precipitation ; microstructure ; mechanical properties
- 会议召开时间：2015-05-20
- 会议录名称：第十三届中国高温合金年会论文集
- 英文会议录名称：Proceedings of the 13th China Superalloys Conference
- 语种：中文
- 分类号：TG132.3
- 学会代码：ZGJS
- 会议名称：第十三届中国高温合金年会
- 会议地点：中国北京
- 主办单位：中国金属学会高温材料分会
- 学会名称：中国金属学会
- 页数：4
- 文件大小：1895k
- 原文格式：O
- 会议级别：全国
摘要
GH4742合金组织性能对制备热历程高度敏感,其他工艺条件一定的情况下,标准热处理状态合金的力学性能由塑性变形温度与固溶处理冷却速度两个高度耦合的工艺参数共同决定。在特定的固溶处理冷却条件下,在大角度奥氏体晶界处γ′相能够以不连续沉淀机制析出,从而使微观组织形态发生重大改变并对力学性能产生影响,因此为了在大尺寸涡轮盘锻件上获得均匀的组织性能需要对上述两个制备工艺参数进行高精度的定量控制。
Microstructures and mechanical properties of GH4742 alloy are closely related to prior thermal history in hot working and heat treatment process.Mechanical properties of as heat treated disc forgings depend on the two highly coupled parameters,i.e.deformation temperature and cooling rate from solutioning temperature,while other processing parameters are fixed.Under certain cooling conditions,γ' phase can discontinuously precipitate at high angle austenite grain boundaries,and the occurrence of this mechanism will greatly modify the morphologies and properties.Therefore,in order to receive an uniform distribution of microstructure and mechanical properties on large scale disc forgings,deformation temperature and cooling rate from solutioning temperature must be carefully customized.
Microstructures and mechanical properties of GH4742 alloy are closely related to prior thermal history in hot working and heat treatment process.Mechanical properties of as heat treated disc forgings depend on the two highly coupled parameters,i.e.deformation temperature and cooling rate from solutioning temperature,while other processing parameters are fixed.Under certain cooling conditions,γ' phase can discontinuously precipitate at high angle austenite grain boundaries,and the occurrence of this mechanism will greatly modify the morphologies and properties.Therefore,in order to receive an uniform distribution of microstructure and mechanical properties on large scale disc forgings,deformation temperature and cooling rate from solutioning temperature must be carefully customized.
引文
[1]龙正东,庄景云,等.一种提高高强化高温合金热加工性能的新方法[J].金属学报,1999,35(11):1211~1213.
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[3]Robson J D.Modeling competitive continuous and discontinuous precipitation[J].Acta Materialia,2013,61:7781~7790.
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[6]Hillert M.On theories of growth during discontinuous precipitation[J].Metallurgical Transactions,1972,3(11):2729~2741.
[7]Porter A,Ralph B.The recrystallization of nickel-base superalloys[J].Journal of Materials Science,1981,16:707~713.
[8]Randle V,Ralph B.Interactions of Grain Boundaries with coherent precipitates during grain growth[J].Acta metall,1986,34(5):891~898.
[2]张北江,赵光普,等.GH742合金热变形行为与微观组织演化[J].金属学报,2005,41(11):1207~1214.
[3]Robson J D.Modeling competitive continuous and discontinuous precipitation[J].Acta Materialia,2013,61:7781~7790.
[4]Cantwell P R,Tang M,et al.Grain boundary complexions[J].Acta Materialia,2014,62:1~48.
[5]Hornbogen E.Systematics of the cellular precipitation reactions[J].Metallurgical Transactions,1972,3(11):2717~2727.
[6]Hillert M.On theories of growth during discontinuous precipitation[J].Metallurgical Transactions,1972,3(11):2729~2741.
[7]Porter A,Ralph B.The recrystallization of nickel-base superalloys[J].Journal of Materials Science,1981,16:707~713.
[8]Randle V,Ralph B.Interactions of Grain Boundaries with coherent precipitates during grain growth[J].Acta metall,1986,34(5):891~898.