Mo含量对第四代单晶高温合金组织及稳定性的影响
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摘要
为优化第四代单晶高温合金的Mo含量,在真空定向凝固炉中采用选晶法制备1%Mo和3%Mo的2种单晶高温合金,采用JMatPro软件计算了不同Mo含量合金相图,通过扫描电镜和能谱仪研究Mo含量对合金凝固特征,铸态组织,热处理组织和1 100℃/1 000 h长期时效组织的影响.结果表明,随着Mo含量增加,固液相线下移,糊状区变宽,γ相和TCP相含量增加;铸态合金中共晶含量减少,γ′相尺寸减小,其均匀化和立方化程度稍有增加;此外,热处理组织中γ′相立方化程度增加,长期时效组织中TCP相析出量增加,合金的组织稳定性下降.
Two single crystal superalloys with 1 % Mo and 3 % Mo were prepared by vacuum directional solidification furnace to optimize the Mo content of the fourth-generation single crystal superalloy. Phase diagrams of the alloys with different Mo contents were calculated by JMatPro software. The effects of Mo contents on the solidification characteristics, as-cast microstructure, heat treatment microstructure and longterm aging microstructure at 1 100 ℃/1 000 h were investigated by SEM and EDS. The results show that with the increase of Mo content, the solidus and liquidus temperature decreases, the mushy zone becomes wider,and the volume fraction of γ phase and TCP phase increase. The volume fraction of γ-γ′ eutectic decreases,and the size of γ′ phase decreases slightly and their homogenization and regularity have been improved.Moreover, when the cubic shape of γ′ phase becomes more regular in the heat treatment microstructure, the volume fraction of TCP phase significantly increases and the microstructure stability decreases.
Two single crystal superalloys with 1 % Mo and 3 % Mo were prepared by vacuum directional solidification furnace to optimize the Mo content of the fourth-generation single crystal superalloy. Phase diagrams of the alloys with different Mo contents were calculated by JMatPro software. The effects of Mo contents on the solidification characteristics, as-cast microstructure, heat treatment microstructure and longterm aging microstructure at 1 100 ℃/1 000 h were investigated by SEM and EDS. The results show that with the increase of Mo content, the solidus and liquidus temperature decreases, the mushy zone becomes wider,and the volume fraction of γ phase and TCP phase increase. The volume fraction of γ-γ′ eutectic decreases,and the size of γ′ phase decreases slightly and their homogenization and regularity have been improved.Moreover, when the cubic shape of γ′ phase becomes more regular in the heat treatment microstructure, the volume fraction of TCP phase significantly increases and the microstructure stability decreases.
引文
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[3]史振学,杨万鹏,刘世忠,等.长期时效温度对一种单晶高温合金的组织和拉伸性能的影响[J].有色金属科学与工程,2018,9(4):35-39.
[4]ARGENCE D,VERNAULT C,DESVALLEES Y,et al.MC-NG:Generation single crystal superalloy for future aeronautical turbine blades and vanes[C]//Superalloys2000.Warrendale,TMS,2000:829-837.
[5]ACHARYA M V,FUCHS G E.The effect of long term thermal exposures on the microstructure and properties of CMSX-10single crystal superalloys[J].Materials Science and Engineering A,2004,381:143-153.
[6]YEH A C,TIN S.Effect of Ru on the high temperature phase stability of Ni-base single crystal superalloys[J].Metallurgical and Materials Transactions A,2006,37A:2621-2631.
[7]HOBBS R A,ZHANG L,RAE C M F,et al.The effect of ruthenium on the intermediate to high temperature creep response of high refractory content single crystal suepralloy[J].Materials Science and Engineering A,2008,489:65-76.
[8]胡壮麒,刘丽荣,金涛,等.镍基单晶高温合金的发展[J].航空发动机,2005,31(3):1-7.
[9]LI J R,ZHONG Z G,TANG D Z,et al.A low-cost second generation single crystal superalloy DD6[C]//Superalloys2000.Warrendale,PA:TMS,2000:777-783.
[10]WALSTON S,CETEL A,MACKAY R,et al.Joint development of a fourth generation single crystal superalloy[C]//Superalloys2004.Pennsylvania,TMS,2004:15-24.
[11]ZHANG J,LI J G,JIN T,et al.Effect of Mo concentration on creep properties of a single crystal nickel-base superalloy[J].Materials Science and Engineering A,2010,527:3051-3056.
[12]ZHANG J X,MURAKUMO T,HARADA H,et al.Creep deformation mechanisms in some modern single-crystal superalloys[C]//Super鄄alloys2004.Pennsylvania,TMS,2004:189-195.
[13]LIU X G,WANG L,LOU L H,et al.Effect of Mo addition on microstructural characteristics in a Re-containing single crystal superalloy[J].Journal of Materials Science and Technology,2015,31(2):143-147.
[14]胡聘聘,陈晶阳,冯强,等.Mo对镍基单晶高温合金组织及持久性能的影响[J].中国有色金属学报,2011,21(2):332-340.
[15]马文有,韩雅芳,李树索,等.Mo含量对一种镍基单晶高温合金显微组织和持久性能的影响[J].金属学报,2006,42(11):1191-1196.
[16]王静,孙锋,董显平,等.几种典型镍基单品高温合金成分设计的热力学分析[J].上海有色金属,2011,32(2):49-56.
[17]FAHRMNN M,FRATZL P,PARJS O,et al.Influence of coherency stress on microstructure evolution in model Ni-AlMo alloys[J].Acta Metallurgical Materialia,1995,43(3):1007-1022.
[18]CARON P.Highγ′solvus new generation nickel-based superalloys for single crystal turbine blade applications[C]//Superalloys2000.Warrendale,TMS,2000:737-746.
[19]CARROLL L J,FENG Q,MANSFIELD J F,et al.Elemental par鄄titioning in Ru-containing nickel-base single crystal superal鄄loys[J].Materials Science and Engineering A,2009,457:292-299.