铼含量微量调整对第三代镍基单晶高温合金组织和高温持久性能的影响
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摘要
制备了名义成分为Ni-9Ta-6Al-6W-4Co-2Cr-0.4Mo-xRe(x分别为6.2,6.8,质量分数/%)的两种单晶高温合金,研究了铼含量对合金铸态显微组织和相转变温度以及热处理态显微组织和高温持久性能的影响。结果表明:微量增加铼后,铸态合金的凝固偏析程度和γ+γ′共晶组织含量均增加,固溶过程中共晶组织快速溶解的峰值温度提高;热处理态合金中的γ′相尺寸略微减小,持久加载过程中拓扑密排相的析出量增加;铼的微量增加显著改变了铼和铬的成分分配比,增强了固溶强化效果,明显提高了合金的高温持久性能。
Two single crystal superalloys with nominal composition of Ni-9Ta-6Al-6W-4Co-2Cr-0.4Mo-xRe(x was 6.2,6.8,respectively,mass fraction/%)were prepared.The effects of Re content on the microstructure and phase transition temperature of the as-cast alloys and on the microstructure and high-temperature stress rupture property of the heat-treated alloys were investigated.The results show that a slight increase of Re content resulted in the increase of the solidification segregation degree and theγ+γ′eutectic structure content in the as-cast alloys.The peak temperatures of rapid dissolution of eutectic structure increased during the solid solution process.The size ofγ′phase in the heat-treated alloys decreased slightly and the topological close-packed phase formation increased in the stress rupture process.The minor increase of Re changed the element partitioning ratios of Re and Cr significantly,improved the solid solution strengthening effect and increased the high-temperature stress rupture properties of the alloys strikingly.
Two single crystal superalloys with nominal composition of Ni-9Ta-6Al-6W-4Co-2Cr-0.4Mo-xRe(x was 6.2,6.8,respectively,mass fraction/%)were prepared.The effects of Re content on the microstructure and phase transition temperature of the as-cast alloys and on the microstructure and high-temperature stress rupture property of the heat-treated alloys were investigated.The results show that a slight increase of Re content resulted in the increase of the solidification segregation degree and theγ+γ′eutectic structure content in the as-cast alloys.The peak temperatures of rapid dissolution of eutectic structure increased during the solid solution process.The size ofγ′phase in the heat-treated alloys decreased slightly and the topological close-packed phase formation increased in the stress rupture process.The minor increase of Re changed the element partitioning ratios of Re and Cr significantly,improved the solid solution strengthening effect and increased the high-temperature stress rupture properties of the alloys strikingly.
引文
[1]POLLOCK T M,TIN S.Nickel-based superalloys for advanced turbine engines:Chemistry,microstructure,and properties[J].Journal of Propulsion and Power,2006,22(2):361-374.
[2]张剑,赵云松,贾玉亮,等.一种镍基单晶高温合金的热机械疲劳行为[J].机械工程材料,2013,37(8):41-49.
[3]WU Q H,ZHANG J,LUO Y S.Composition and mechanical property of DD6 superalloy revert[J].Materials Science Forum,2014,788:488-492.
[4]骆宇时,郭会明,赵云松,等.热等静压对第二代DD6单晶高温合金高温高周疲劳性能的影响[J].机械工程材料,2016,40(7):51-55.
[5]REED R C.The superalloys:Fundamentals and applications[M].Cambridge:Cambridge University Press,2006.
[6]KOIZUMI Y,KOBAYASHI T,YOKOKAWA T,et al.Development of next-generation Ni-base single crystal superalloys[C]//Superalloys 2004.Warrendale,PA:TMS,2004:35-43.
[7]BLAVETTE D,CARON P,KHAN T.An atom probe investigation of the role of rhenium additions in improving creep resistance of Ni-base superalloys[J].Scripta Metallurgica,1986,20(10):1395-1400.
[8]NEUMEIER S,PYCZAK F,GOKEN M.The influence of ruthenium and rhenium on the local properties of theγandγ'phase in nickel-base superalloys and their consequences for alloy behavior[C]//Superalloys 2008.Champion,PA:TMS,2008:109-119.
[9]HECKL A,NEUMEIER S,GKEN M,et al.The effect of Re and Ru onγ/γ′microstructure,γ-solid solution strengthening and creep strength in nickel-base superalloys[J].Materials Science and Engineering A,2011,528(9):3435-3444.
[10]FLEISCHMANN E,MILLER M K,AFFELDT E,et al.Quantitative experimental determination of the solid solution hardening potential of rhenium,tungsten and molybdenum in single-crystal nickel-based superalloys[J].Acta Materialia,2015,87:350-356.
[11]GIAMEI A,ANTON D.Rhenium additions to a Ni-base superalloy:Effects on microstructure[J].Metallurgical and Materials Transactions A,1985,16(11):1997-2005.
[12]骆宇时,李嘉荣,刘世忠,等.Re对单晶高温合金持久性能的强化作用[J].材料工程,2005(8):10-14.
[13]方向.一种第三代镍基单晶高温合金的组织及持久性能[D].北京:北京航空材料研究院,2016.
[14]任怀亮.金相实验技术[M].北京:冶金工业出版社,2004.
[15]陈晶阳,赵宾,冯强,等.Ru和Cr对镍基单晶高温合金γ/γ′热处理组织演变的影响[J].金属学报,2010,46(8):897-906.
[16]刘刚,刘林,张胜霞,等.Re和Ru对镍基单晶高温合金组织偏析的影响[J].金属学报,2012,48(7):845-852.
[17]WANG X G,LIU J L,JIN T,et al.Creep deformation related to dislocations cutting theγ′phase of a Ni-base single crystal superalloy[J].Materials Science and Engineering A,2014,626:406-414.
[18]CHEN J Y,FENG Q,CAO L M,et al.Improvement of stress-rupture property by Cr addition in Ni-based single crystal superalloys[J].Materials Science and Engineering A,2011,528:3791-3798.
[19]ZHANG J X,WANG J C,HARADA H,et al.The effect of lattice misfit on the dislocation motion in superalloys during high-temperature low-stress creep[J].Acta Materialia,2005,53(17):4623-4633.
[20]ROWLAND L J,FENG Q,POLLOCK T M.Microstructural stability and creep of Ru-containing nickelbase superalloys[M].Warrendale:Minerals,Metals&Materials Soc,2004.
[21]WANG T,SHENG G,LIU Z K,et al.Coarsening kinetics ofγ'precipitates in the Ni-Al-Mo system[J].Acta Materialia,2008,56(19):5544-5551.
[22]RUSING J,WANDERKA N,CZUBAYKO U,et al.Rhenium distribution in the matrix and near the particlematrix interface in a model Ni-Al-Ta-Re superalloy[J].Scripta Materialia,2002,46(3):235-240.
[2]张剑,赵云松,贾玉亮,等.一种镍基单晶高温合金的热机械疲劳行为[J].机械工程材料,2013,37(8):41-49.
[3]WU Q H,ZHANG J,LUO Y S.Composition and mechanical property of DD6 superalloy revert[J].Materials Science Forum,2014,788:488-492.
[4]骆宇时,郭会明,赵云松,等.热等静压对第二代DD6单晶高温合金高温高周疲劳性能的影响[J].机械工程材料,2016,40(7):51-55.
[5]REED R C.The superalloys:Fundamentals and applications[M].Cambridge:Cambridge University Press,2006.
[6]KOIZUMI Y,KOBAYASHI T,YOKOKAWA T,et al.Development of next-generation Ni-base single crystal superalloys[C]//Superalloys 2004.Warrendale,PA:TMS,2004:35-43.
[7]BLAVETTE D,CARON P,KHAN T.An atom probe investigation of the role of rhenium additions in improving creep resistance of Ni-base superalloys[J].Scripta Metallurgica,1986,20(10):1395-1400.
[8]NEUMEIER S,PYCZAK F,GOKEN M.The influence of ruthenium and rhenium on the local properties of theγandγ'phase in nickel-base superalloys and their consequences for alloy behavior[C]//Superalloys 2008.Champion,PA:TMS,2008:109-119.
[9]HECKL A,NEUMEIER S,GKEN M,et al.The effect of Re and Ru onγ/γ′microstructure,γ-solid solution strengthening and creep strength in nickel-base superalloys[J].Materials Science and Engineering A,2011,528(9):3435-3444.
[10]FLEISCHMANN E,MILLER M K,AFFELDT E,et al.Quantitative experimental determination of the solid solution hardening potential of rhenium,tungsten and molybdenum in single-crystal nickel-based superalloys[J].Acta Materialia,2015,87:350-356.
[11]GIAMEI A,ANTON D.Rhenium additions to a Ni-base superalloy:Effects on microstructure[J].Metallurgical and Materials Transactions A,1985,16(11):1997-2005.
[12]骆宇时,李嘉荣,刘世忠,等.Re对单晶高温合金持久性能的强化作用[J].材料工程,2005(8):10-14.
[13]方向.一种第三代镍基单晶高温合金的组织及持久性能[D].北京:北京航空材料研究院,2016.
[14]任怀亮.金相实验技术[M].北京:冶金工业出版社,2004.
[15]陈晶阳,赵宾,冯强,等.Ru和Cr对镍基单晶高温合金γ/γ′热处理组织演变的影响[J].金属学报,2010,46(8):897-906.
[16]刘刚,刘林,张胜霞,等.Re和Ru对镍基单晶高温合金组织偏析的影响[J].金属学报,2012,48(7):845-852.
[17]WANG X G,LIU J L,JIN T,et al.Creep deformation related to dislocations cutting theγ′phase of a Ni-base single crystal superalloy[J].Materials Science and Engineering A,2014,626:406-414.
[18]CHEN J Y,FENG Q,CAO L M,et al.Improvement of stress-rupture property by Cr addition in Ni-based single crystal superalloys[J].Materials Science and Engineering A,2011,528:3791-3798.
[19]ZHANG J X,WANG J C,HARADA H,et al.The effect of lattice misfit on the dislocation motion in superalloys during high-temperature low-stress creep[J].Acta Materialia,2005,53(17):4623-4633.
[20]ROWLAND L J,FENG Q,POLLOCK T M.Microstructural stability and creep of Ru-containing nickelbase superalloys[M].Warrendale:Minerals,Metals&Materials Soc,2004.
[21]WANG T,SHENG G,LIU Z K,et al.Coarsening kinetics ofγ'precipitates in the Ni-Al-Mo system[J].Acta Materialia,2008,56(19):5544-5551.
[22]RUSING J,WANDERKA N,CZUBAYKO U,et al.Rhenium distribution in the matrix and near the particlematrix interface in a model Ni-Al-Ta-Re superalloy[J].Scripta Materialia,2002,46(3):235-240.