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GH4169合金非均匀组织在加热过程中的演化机理 被引量:11

MECHANISMS OF NON-UNIFORM MICROSTRUCTURE EVOLUTION IN GH4169 ALLOY DURING HEATING PROCESS
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摘要 通过对第二相状态、晶界取向差及晶粒尺寸演化的分析,研究了GH4169合金不均匀组织在加热过程中的演化机理.结果表明,GH4169合金中d相的体积分数在低温下随温度的升高和时间的延长而增加;在高温时随温度的升高而降低,随时间的延长先增加后降低至恒定值.第二相的钉扎作用表现为:晶内析出的d相和g"相阻碍位错的运动,沿晶界析出的d相阻碍再结晶晶粒的形核和长大,碳化物阻碍晶粒长大.小角度晶界的体积分数随加热温度的升高和时间的延长而降低;高温下,退火孪晶的生长使得小角度晶界含量增加.GH4169合金的组织演化机理主要包括:亚晶长大、再结晶晶粒的长大和退火孪晶的长大.新的再结晶晶粒主要通过亚晶长大过程获得,亚晶长大过程主要通过小角度晶界的转动和位错的迁移完成.晶粒长大过程受到抑制时,合金通过退火孪晶的形核及长大耗散其吸收的热量. The Ni-Fe-based superalloy GH4169(Inconel718) is widely used for several critical gas-turbine components which are hot forged.Its microstructure and property are sensitive to the parameter adjustment during hot working process.To obtain required low-cycle fatigue and fracture properties,it is essential that the microstructure is controlled during preheating and heat treatment.The evolution of non-uniform microstructure during hot working is more complicated than that of uniform microstructure.On the other hand,various secondary phases can be observed in GH4169 alloy,thus it is important to investigate the effect of secondary phases on the microstructure evolution during forging process.In this work,the mechanisms of non-uniform microstructure evolution in GH4169 alloy were studied by analyzing the evolution of secondary phases,grain boundary misorientation,grain size and interactions of dislocation.It is found that the volume fraction of d phase increases with the increasing of temperature and heating time at the lower temperature.While at the higher temperature,it decreases monotonously with the temperature increasing,but increases first and then decreases to stable value with time increasing.The pinning effect of secondary phases in GH4169 alloy can be concluded that the g" phase and d phase precipitated within the grains retain movement of dislocation,the d phase precipitated at the grain boundary hinders the nucleation and growth of recrystallized grains,and the carbides limits the grain growth.The frequency of low angle grain boundary decreases with temperature and time increasing,and the mobility of low angle grain boundary increases with temperature increasing.The uniformity of microstructure and the size of equaxied subgrain increases with heating temperature and time increasing.Continuous recrystallization of elongated grain occurs at specific conditions.The mechanisms of non-uniform microstructure evolution during heating process can be concluded as subgrain growth,recrystallized grain growth,and
出处 《金属学报》 SCIE EI CAS CSCD 北大核心 2016年第6期707-716,共10页 Acta Metallurgica Sinica
基金 国家自然科学基金资助项目51504195~~
关键词 GH4169合金 第二相 晶界取向差 亚晶长大 GH4169 alloy secondary phase grain boundary misorientation subgrain growth
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  • 1鲁风鸣,金槿秀.GH169合金涡轮盘件长期时效组织稳定性的研究[J].金属学报,1995,(31增刊):14. 被引量:2
  • 2Oblak.J.M,Pauionis.D.F,Duvall.D.S.Coherency strengthening in Ni-bese alloys hardened by DO22 precipitates.Metallurgical Transactinns A,1974,5(1):143-153 被引量:1
  • 3Burger.J.L,Biederman.R.R,Couts.W.H.The effects of starting condition on the aging response of as-forged alloy 718."Superalloy 718-Metalhurgy and Applieations",eds.E.A.Loria,TMS,1989:207-217 被引量:1
  • 4冶军.美国镍基高温合金.北京科学出版社,1979:62-68 被引量:2
  • 5Dong.J.X,Xie.X.S,Zhang.S.H.Coarsening behavior of γn precipitates in modified Inconel 718 superalloy.Scripta Materialia,1995,33(12):1933-1939 被引量:1
  • 6Sundararaman.M,Mukhopadhyay.P,Banerjee.S.Precipitation and room temperature deformation behavior of Inconel 718."Superalloys 718,625 Various Dervatives",ets.E.A.Loria.,TMS.1994:419-440 被引量:1
  • 7Burke.M.G,Miller.M.K,Precipitation in alloy 718:A combined AEM and APFIM investigation."Superalloys 718,625,706 and Various Derivatives",eds.E.A.LOria,TMS.1991:337-350 被引量:1
  • 8Devadas C.The thermal and metallurgical state of steel strip during hot rolling:part 3.Microstructural evolution[J].Metallurgical Transactions A,1991,22A:335-342. 被引量:1
  • 9Raghunathan N,Sheppard T.Microstructural developmeat during annealing of hot rolled Al2Mg alloys[J].Materials Science and Techonology,1986,6:542-547. 被引量:1

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