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Han F.-K.,High Temperature Materials Research Institute | Yan P.,High Temperature Materials Research Institute | Zhao J.-C.,High Temperature Materials Research Institute | Zeng Q.,High Temperature Materials Research Institute | And 3 more authors.
Journal of Iron and Steel Research | Year: 2013

Effect of Ru on distribution and microstructure of Ni-Al-Re was investigated by SEM, DSC and atom probe analysis means. The results show that Ru is benefit to the precipitate of γ' phase, and have important influence on the distribution of Re. Source


Huang Y.-H.,University of Science and Technology Beijing | Zhang Y.-W.,University of Science and Technology Beijing | Zhang Y.-W.,High Temperature Materials Research Institute | Wang F.-M.,University of Science and Technology Beijing | And 2 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2012

In order to remove the prior particle boundary (PPB) precipitation in FGH4097 P/M superalloys, thermodynamic equilibrium precipitated phases in FGH4097 P/M superalloy were calculated using Thermo-Calc software. Meanwhile, the microstructure and EDS analysis of FGH4097 P/M superalloys with different Hf contents were also investigated. The distribution of Hf in FGH4097 alloy and the effect of Hf on precipitated phases were studied, especially the effect of Hf on PPB was analyzed. The results show that Hf exists mainly in MC, MB 2 and γ'-phase of FGH4097 alloy. Hf can promote the precipitation of MC and γ'-phase and effectively restrain from the precipitation of M 6C and M 23C 6 carbides. PPB precipitation could be eliminated when the content of Hf is 0.30% mass fraction in FGH4097 alloy. Source


Wang L.,Northeastern University China | Wang S.,Northeastern University China | Liu Y.,Northeastern University China | Zhao G.,High Temperature Materials Research Institute
Materials Science Forum | Year: 2010

Compression test for GH4586 superalloy was carried out at 1273 K and 1373 K with stain from 20% to 60%. The characteristics of dynamic recrystallization were investigated by confocal laser scanning microscope, TEM and EBSD. It was found that at 1273 K dynamic recrystallization mainly took place along preexisting grain boundaries creating a necklace structure. It was confirmed by TEM observations that the first layer of the necklace structure was formed by the mechanism of bulging of substructure boundaries and the following layers were nucleated at the triple junctions of former dynamic recrystallization grains. When specimens were deformed with different strains at 1373 K, dynamic recrystallization was almost completed. Our observation showed that twinning played an important role during dynamic recrystallization by promoting dynamic recrystallization grains growing. Substructures of grains were constructed by the reconfiguration of dislocations hindered at large γ' particles in interior of initial grains during dynamic recovery. © (2010) Trans Tech Publications. Source


Huang Y.-H.,University of Science and Technology Beijing | Zhang Y.-W.,University of Science and Technology Beijing | Zhang Y.-W.,High Temperature Materials Research Institute | Wang F.-M.,University of Science and Technology Beijing | And 2 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2012

Microstructure and precipitates of loose powders and the powder particles on fracture surface of FGH97 P/M super-alloys with different Hf contents were investigated. The results show that there are mainly Nb-, Ti-and Hf-rich MC type carbides in the initial powders, zirconium oxide is also observed in the powders. Hf exists mainly in MC carbides and it can promote the precipitation of stable MC carbides in powders. Adding appropriate Hf is beneficial to elimination of prior particle boundary (PPB) precipitation in the alloy. On powder particles surface, Hf exists in the form of compounds HfC and HfO2, which has adverse effect on PPB when Hf content is greater than 0.60%. Source


Wang S.,Northeastern University China | Wang L.,Northeastern University China | Liu Y.,Northeastern University China | Xu G.,High Temperature Materials Research Institute | And 2 more authors.
Acta Metallurgica Sinica (English Letters) | Year: 2011

Hot compression test was carried out at 1000 °C to investigate the dynamic recrystallization nucleation mechanism of a nickel-base superalloy. It was found that the bulging of original grain boundaries was inhibited by carbides and deformation twins at the boundaries. Recrystallized nuclei evolved from the subgrains of dislocation reconfiguration along original grain boundaries, and the growth of the potential nuclei was carried out by the coalescence of subgrains. The necklace structure of recrystallized grains along original grain boundaries was attributed to the strain gradient from grain boundary to grain interior. Source

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