Production of Net-Shape Static Parts by Direct HIPing of Nickel Base Superalloy Prealloyed Powders

Raisson, G.; Guedou, J.Y.; Guichard, D.; Rongvaux, J.M.

doi:10.4028/www.scientific.net/amr.278.277

Cited by 41 publications

(16 citation statements)

References 3 publications

(7 reference statements)

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“…In a conventional and costly powder route, the hot processes, such as hot extrusion and isothermal forging after HIPping, are mostly utilized to obtain disc parts with a desired microstructure [ 10 ]. Direct hot isostatic pressing (as-HIP) could dramatically decrease the cost of PM superalloys, and it is capable of producing near-net or net shape parts [ 8 , 11 , 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of Temperature and Pressure of Hot Isostatic Pressing on the Grain Structure of Powder Metallurgy Superalloy

Tan

Liu

et al. 2018

Materials

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The microstructure with homogeneously distributed grains and less prior particle boundary (PPB) precipitates is always desired for powder metallurgy superalloys after hot isostatic pressing (HIPping). In this work, we studied the effects of HIPping parameters, temperature and pressure on the grain structure in PM superalloy FGH96, by means of scanning electron microscope (SEM), electron backscatter diffraction (EBSD), transmission electron microscope (TEM) and Time-of-flight secondary ion spectrometry (ToF-SIMS). It was found that temperature and pressure played different roles in controlling PPB precipitation and grain structure during HIPping, the tendency of grain coarsening under high temperature could be inhibited by increasing HIPping pressure which facilitates the recrystallization. In general, relatively high temperature and pressure of HIPping were preferred to obtain an as-HIPped superalloy FGH96 with diminished PPB precipitation and homogeneously refined grains.

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Section: Introductionmentioning

confidence: 99%

Effects of Temperature and Pressure of Hot Isostatic Pressing on the Grain Structure of Powder Metallurgy Superalloy

Tan

Liu

et al. 2018

Materials

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“…Net-shape HIPing [1][2][3][4][5] offers a possible solution to this high cost of producing components from powder since this would lead to the reduction in forging and machining operations and thus to considerable cost reduction. The interest in this technology has been further spurred by the remarkable achievement in dimensional accuracy control in recent years through modeling [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Influence of heat treatment on microstructure and tensile behavior of a hot isostatically pressed nickel-based superalloy

Qiu

Mei

et al. 2013

Journal of Alloys and Compounds

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A nickel-based superalloy powder RR1000 has been hot isotatically pressed (HIPed) and heat treated to produce different microstructures. Microstructures were investigated using a scanning electron microscope (SEM). Tensile testing was performed at room temperature and 700ºC and the deformed samples were examined using SEM and transmission electron microscope (TEM). It was found that in the as-HIPed condition the microstructure consisted of coarse and irregularshaped primary and secondary γ′ together with a low volume fraction of fine γ′ (<50nm in diameter). Solution treatment below the γ′ solvus followed by air cooling resulted in the formation of finer cuboidal secondary γ′ (350nm-750nm) and medium-sized spherical tertiary γ′ (100nm-200nm). This led to an improvement of both the 0.2% yield strength and ultimate tensile strength. Ageing of the solution-treated or of the as-HIPed samples at 760°C resulted in the precipitation of a high population of fine γ′ (around 50nm) which further increased the strength. Within the resolution limit of the current TEM analysis, deformation at room temperature seemed to occur mainly by dislocations cutting through secondary γ′ and very fine γ′, accompanied by the formation of stacking faults within these precipitates; most of the mediumsized tertiary γ′ precipitates in solution-treated and aged samples were not cut through but were surrounded by dislocations. Deformation at 700℃ happened by dislocations cutting through γ′ precipitates and γ matrix, leading to the formation of extended stacking faults across both γ and γ′. It is suggested that the optimum treatment of the powder superalloy is to solution-treat and age after HIPing; this results in properties which are comparable with those of thermomechanically processed samples.

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“…Net-shape hot isostatic pressing of alloy powder enables production of complex components with reduced cost due to the elimination of forging or extrusion and of massive machining operations and thus has been considered as one of the advanced manufacturing routes for production of high performance components and structures for aerospace application. Several components have been made from Ti alloys and nickel-based superalloys [1][2][3][4]. However, because no thermo-mechanical processing such as forging and extrusion is involved, defects such as inclusions, porosity and prior particle boundaries (PPBs) which may be present in the powder may also be present in as-HIPped or HIPped and heat treated materials.…”

Section: Introductionmentioning

confidence: 99%

High cycle fatigue and fracture behaviour of a hot isostatically pressed nickel-based superalloy

Qiu

2013

Philosophical Magazine

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Production of Net-Shape Static Parts by Direct HIPing of Nickel Base Superalloy Prealloyed Powders

Cited by 41 publications

References 3 publications

Effects of Temperature and Pressure of Hot Isostatic Pressing on the Grain Structure of Powder Metallurgy Superalloy

Effects of Temperature and Pressure of Hot Isostatic Pressing on the Grain Structure of Powder Metallurgy Superalloy

Influence of heat treatment on microstructure and tensile behavior of a hot isostatically pressed nickel-based superalloy

High cycle fatigue and fracture behaviour of a hot isostatically pressed nickel-based superalloy

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