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PPB structure elimination,DRX nucleation mechanisms and grain growth behavior of the3rd-generation pm superalloy for manufacturing aviation components

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Chinese Journal of Aeronautics 2024年第1期37卷 325-344页

作者： Baoyun ZHANG Yongquan NING Zhaotian WANG Qiaomu LIU School of Materials Science and Engineering Northwestern Polytechnical UniversityXi’an 710072China AECC Sichuan Gas Turbine Establishment Chengdu 610500China

Previous Particle Boundary(PPB),as the detrimental structure in Powder Metallurgy(pm)components,should be eliminated by subsequent hot process to improve the mechanical *** objective is to investigate the Dynamic Recrystallization(DRX)nucleation mechanisms and grain growth behavior of the 3rd-generation pm superalloy with PPB *** observation reveals that PPB decorated with(Ti,Ta,Nb)C carbides belongs to the discontinuous chain-like *** elimination of PPB networks can be achieved effectively via hot deformation due to the occurrence of *** different DRX nucleation mechanisms were proposed and discussed in detail according to the special microstructure characteristics of the pm ***,local lattice rotations can be detected in the vicinity of(Ti,Ta,Nb)C carbides during hot deformation and thus PPB structure serves as the preferential nucleation sites for DRX grains via Particle-Stimulated Nucleation(PSN).Then,Discontinuous-DRX(DDRX)characterized by grain boundary bulging dominates the microstructure refinement and Continuous-DRX(CDRX)operated by subgrain rotation can be regarded as an important assistant *** last,the initial Σ3 boundaries would lose their twin characteristics owing to the crystal rotation and then transform into the general High Angle Grain Boundaries(HAGBs).The distorted twins provide additional DRX nucleation sites,viz.,twin-assisted *** attention was focused on the grain growth behavior of the pm superalloy in subsequent annealing *** recrystallization temperature was determined to be about 1110.C and 1140.C can be considered as the critical temperature for grain *** findings would provide theoretical support for microstructure refinement of the 3rd-generation pm superalloy,which is of pivotal significance for improving the mechanical properties of aviation components.

关键词： pm superalloy Previous Particle Boundary(PPB) DRX nucleation Grain growth Microstructure refinement

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Effect of Hf and Zr Contents on Stress-rupture and Fatigue Crack Growth Rate Performances in FGH96pm superalloy

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Journal of Iron and Steel Research International 2014年第3期21卷 382-388页

作者： Tian XIA Yi-wen ZHANG Yue CHI High Temperature Materials Research Institute Central Iron and Steel Research Institute Beijing Key Laboratory of Advanced High Temperature Materials

Four experimental FGH96 alloys with various contents of Hf and Zr （0 and 0.04%, 0.3% and 0.04%, 0.6% and 0. 04%, 0. 3% and 0.06%, respectively） were produced using PREP （plasma rotating electrode process）＋ HIP （hot isostatic pressing） route. The unnotched and notched stress-rupture properties and fatigue crack growth rate （FCGR） of all the experimental alloys were investigated to study the effect of Hf and Zr. Relevant fracture morphol ogy and microstructure were observed by scanning electron microscopy and transmission electron microscopy. The results revealed that appropriate content of Hf could lengthen stress-rupture life, eliminate notch sensitivity and slo wer FCGR. Microstructure analysis showed that the amount of ＂f phase should be increased or decreased by adjusting Hf and Zr contents, and MC carbide and oxide coupled growth should be increased by adding Hf content, which caused oxycarbide to precipitate along grain boundary and strengthen the alloy. It was found that excessive Zr in Hf- containing FGH96 alloy had certain deleterious effects on stress-rupture property because there was strong Zr segre- gation at prior particle boundary, leaving a long chain of large-size oxides along the boundary. The optimal content of Hf and Zr in FGH96 alloy was 0.6% and 0. 04%, respectively.

关键词： pm superalloy FGH96 HI Zr stress rupture carbide oxide

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Microstructure and Properties of an Advanced Nickel-base pm superalloy

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Journal of Iron and Steel Research International 2014年第12期21卷 1152-1157页

作者： Chao-jie WU Yu TAO Jian JIA Central Iron and Steel Research Institute

The need for nickel-base powder metallurgy （pm） superalloy turbine discs is becoming increasingly evi dent. With the eventual aim of improving thrust-to-weight ratio of aeroengines for power generation, well integration of significantly high strength, high damage tolerance and high-temperature capability would be reasonably required. An advanced pm superalloy, which was designed for applications up to 815- 8 5 0 ℃, was experimentally investigated. Emphasis was primarily put on microstructure and mechanical properties. The results indicated the measured phases in the sample were composed of γ,γ＇, MC, and Ma B2. With uniform coarse grain microstruc ture （ASTM 5-6）, the sample appeared to exhibit overwhelming superiority over the prior art materials FGH95, FGH96, FGH97 and FGH98. The dominant embodiments consisted of high tensile strength （Rm = 1000 MPa and Rp0.2 800 MPa at 850℃）, strong creep resistance （ξp 0.12% at 815 ℃/400 MPa/50 h）, and considerable stressrupture life （τ=457.4 h at 815 ℃/450 MPa）. The technical practicability of applications up to 815-850 ℃ of this alloy was conclusively proved.

关键词： pm superalloy microstructure mechanical property

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Innovative technologies for powder metallurgy-based disk superalloys: Progress and proposal

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Chinese Physics B 2016年第2期25卷 320-326页

作者：贾崇林葛昌纯燕青芝 School of Materials Science and Engineering University of Science and Technology Beijing Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical Materials

Powder metallurgy（pm） superalloys are an important class of high temperature structural materials, key to the rotating components of aero engines. In the purview of the present challenges associated with pm superalloys, two novel approaches namely, powder preparation and the innovative spray-forming technique（for making turbine disk） are proposed and ***, advanced technologies like electrode-induction-melting gas atomization（EIGA）, and spark-plasma discharge spheroidization（SPDS） are introduced, for ceramic-free superalloy powders. Presently, new processing routes are sought after for preparing finer and cleaner raw powders for disk superalloys. The progress of research in spray-formed pm superalloys is first summarized in detail. The spray-formed superalloy disks specifically exhibit excellent mechanical properties. This paper reviews the recent progress in innovative technologies for pm superalloys, with an emphasis on new ideas and approaches, central to the innovation driving techniques like powder processing and spray forming.

关键词： pm superalloy innovative technology powder preparation spray forming

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Microstructure,Properties and Heat Treatment Process of Powder Metallurgy superalloy FGH95

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Journal of Iron and Steel Research International 2006年第5期13卷 65-68页

作者： GUO Wei-min WU Jian-tao ZHANG Feng-ge ZHAO Ming-han High Temperature Materials Research Institute Central Iron and Steel Research Institute Beijing 100081 China

Microstructure and properties of nickel based powder metallurgy （pm） superalloy were presented. Effects of nonmetallic inclusions and heat treatment on microstructure and properties were. discussed. Development tend... 详细信息

关键词： microstructure property pm superalloy heat treatment

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