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Numerical analysis on solidification process and heat transfer of FGH95 superalloy droplets during PREP

Journal of University of Science and Technology Beijing 2003年第5期10卷 53-58页

作者： HuanmingChen BenfuHu YiwenZhang quanmaoyu HuiyingLi MaterialsScienceandEngineeringSchool UniversityofScienceandTechnologyBeijingBeijing100083China PhysicsandElectricalInformationEngineeringSchool NingxiaUniversityYinchuan750021China CentralIronandSteelResearchInstitute Beijing100081China

In order to understand the relation between microstructure of superalloypowders and its solidification progress, the processing parameters are optimized during plasmarotating electrode processing (PREP). It was predicted from the results that the droplet velocities,droplet temperature, and fractional solidification with flight time about FGH95 superalloy droplethave been carried out based on Newtonian heat transfer formulation coupled with the classicalheterogeneous nucleation and the specific solidification process. It has been found that the dropletdynamic and thermal behavior is strongly affected by the distribution of droplet diameters, theproportion of cooling atmosphere, but is relatively unaffected by the droplet superheat.

关键词： plasma rotating electrode processing (PREP) heat transfer FGH95 superalloypowder numerical analysis

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Influence of Processing Parameters on Granularity Distribution of Superalloy Powders during PREP

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Journal of Materials Science & Technology 2003年第6期19卷 587-590页

作者： HuanmingCHEN BenfuHU YiwenZHANG HuiyingLI quanmaoyu UniversityofScience&TechnologyBeijing Beijing100083China CentralIronandSteelResearchInstitute Beijing100081China

In order to investigate the influence of processing parameters on the granularity distribution of superalloy powders during the atomization of plasma rotating electrode processing (PREP), in this paper FGH95 superalloy powders is prepared under different processing conditions by PREP and the influence of PREP processing parameters on the granularity distribution of FGH95 superalloy powders is discussed based on fractal geometry theory. The results show that with the increase of rotating velocity of the self-consuming electrode, the fractal dimension of the granularity distribution increases linearly, which results in the increase of the proportion of smaller powders. The change of interval between plasma gun and the self-consuming electrode has a little effect on the granularity distribution, also the fractal dimension of the granularity distribution changed a little correspondingly.

关键词： FGH95 superalloy powders Granularity distribution Plasma rotating electrode processing (PREP),Fractal dimension

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High temperature strength and ductility of the(C+N)strengthening Fe-Cr-Mn(W,V)steels

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Journal of University of Science and Technology Beijing 2002年第4期9卷 292-297页

作者： BenfuHu quanmaoyu LinLu ChengchangJia HiroshiKinoshita HeishichiroTakahashi MaterialsScienceandEngineeringSchool UniversityofScienceandTechnologyBeijingBeijing100083China CenterforAdvaacedResearchofEnergy HokkaidoUniversitySapporo060Japaa

Fe-Cr-Mn(W, V) austenite steels used as low radioactive structural materialsin fusion reactor have been investigated. The results show that the high temperature strength andthe creep fracture life of Fe-Cr-Mn(W, V) steels can be effectively improved through (C+N)complex-strengthening, so can be the high temperature ductility. The strength and ductility of thesteels are superior to that of SUS316 steels and JPCAS below 673 K. The relationship betweenstrength, ductility and the formation temperature is related to the evolution of deformationmicrostructure. The fracture and microstructure observation above 673 K indicates that the main wayto further improve ductility at high temperature is the control of carbide coarsening at the grainboundaries.

关键词： Fe-Cr-Mn steels high temperature strength deformation martensite stacking faults (SF)

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