Influence of Powder Particle Size Distribution and Pressure on the Kinetics of Hot Isostatic Pressing (HIP) Consolidation of P/M Superalloy Rene 95

Kissinger, R.D.; Nair, S. V.; Tien, J. K.

doi:10.7449/1984/superalloys_1984_285_294

Cited by 8 publications

(5 citation statements)

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“…However, these modifications lead to strong segregation in the cast ingots and to a dramatic reduction in formability by forging. According to this, nowadays, a powder metallurgy route called near net shape hot isostatic pressing or (HIPping) is considered very promising to manufacture parts made of those Ni superalloys that are difficult to forge [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17]. This procedure offers a reduction of machining operations and of raw material consumption concerning forging with a consequent reduction of buy to fly ratio as demonstrated by Bassini et al in [18].…”

Section: Introductionmentioning

confidence: 99%

Study of the Effects of Aging Treatment on Astroloy Processed via Hot Isostatic Pressing

et al. 2019

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The effect of aging treatment on Astroloy fabricated via hot isostatic pressing and subjected to super-, and sub- solvus solutioning has been investigated. The evolution of hardness and microstructural features were followed after each step of the treatment. Since this alloy is commonly subjected to a double aging treatment at two different temperatures, particular attention was given to the effectiveness of the first aging treatment compared to the second one. Coarsening and modification of the γ′ reinforcing system together with carbides formation were made the object of research. The cooling rate used after solutioning treatment was also kept into account. Finally, a model to describe secondary and ternary gamma prime coarsening upon aging treatments is presented.

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Section: Introductionmentioning

confidence: 99%

Study of the Effects of Aging Treatment on Astroloy Processed via Hot Isostatic Pressing

et al. 2019

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“…Particularly, they even found that the presence of TiB network structure is beneficial for high temperature strengths [10]. This is contradictory with conventional belief that PPBs decorated by precipitates are harmful for mechanical properties of materials synthesised by powder metallurgy, especially high temperature mechanical properties such as strengths, ductility, creep rupture and fatigue [11][12][13][14][15][16][17][18][19][20][21][22]. It is obvious that for applications, more studies are required to comprehensively investigate the mechanical properties of titanium alloy composites with this kind of network structure.…”

Section: Introductionmentioning

confidence: 90%

Hot isostatic pressing of in-situ TiB/Ti-6Al-4V composites with novel reinforcement architecture, enhanced hardness and elevated tribological properties

Cai

Song

Qiu

et al. 2017

Journal of Alloys and Compounds

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In this study, titanium borides reinforced Ti-6Al-4V composites have been successfully prepared by hot isostatic pressing (HIPing). The microstructure of the as-fabricated samples was investigated using X-ray diffraction (XRD) technique, secondary electron microscopy (SEM) and electron backscatter diffraction (EBSD) and the mechanical properties evaluated through microhardness and wear resistance measurements together with nano-indentation. It was found that during HIPing the additive particles TiB2 have transformed into TiB needles which tend to decorate at prior particle boundaries of the consolidated powder particles to form a network structure. Under the same HIPing condition, the needles became increasingly coarser and agglomerated with increased addition of TiB2. Meanwhile, a large population of TiB needles have grown into the prior particle matrix, which is believed to be beneficial to the bonding between particles. The micro-hardness of the synthesised materials increased with increased volume fraction of TiB. Nano-indentation measurement demonstrates that the TiB network structure shows much higher nanohardness than the surrounding matrix regions. The friction coefficient of the synthesised composites decreased continuously with increased volume fraction of TiB, indicating improved wear resistance. High resolution transmission electron microscopy (HRTEM) analysis on wear debris revealed the formation of a series of oxides suggesting that chemical reaction between alloy elements and oxygen in air may have happened. It is thus concluded that the wearing of the current samples is a result of both friction and chemical reaction.

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“…The HIP process has been modeled by only a few groups [5][6][7][8][9][10][11]. The models assume the powder to be spherical and of either a single size [10,11], or more realistically, a bimodal distribution of sizes [8,9].…”

Section: Hip Modelingmentioning

confidence: 99%

“…For many maturity in the past decade, is now used for the materials, including the high T Q oxide densification of powder consolidates of nuclear superconductors, there are other considerations fuels, tool steels, titanium alloys and other that restrict the preferred sintering temperature, non-ferrous and often refractory alloys, ceramics, For example, for refractory metals and ceramics, composites, and superalloys for critical rotating the melting points are so high that the achievement applications [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Hot Isostatic Pressing (HIP) Densification Of Oxide Superconductors

et al. 1988

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Currently, consolidation of oxide superconductor powders is done by sintering, which is not effective in the reduction of porosity. This work demonstrates the feasibility of hot isostatic pressing (HIP) to obtain fully dense bulk superconductor. Modeling of the HIP process was used to predict HIP conditions for production of fully dense superconducting material.It is predicted that fully dense YBa Cu3O can be obtained in reasonable times at temperatures down to around 650 °C. The trade -offs between temperature, time, and pressure during HIP densification are analyzed as well as the effects of powder particle size and entrapped gas pressure. The HIP modeling has been verified experimentally under three conditions: 100 MPa HIP at 900 °C for 2 hours (99.3% dense -full density), 100 MPa HIP at 750 °C for 2 hours (96% dense), and sintering at 950 °C for 16 hours (65% dense). A superconducting Meissner signal has been obtained on the fully dense specimen after a post -HIP heat treatment.

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Influence of Powder Particle Size Distribution and Pressure on the Kinetics of Hot Isostatic Pressing (HIP) Consolidation of P/M Superalloy Rene 95

Abstract: the distribution of particle sizes on the kinetics of densification. The analytical model also suggests HIP conditions for more uniform deformation of all powder particles.

Cited by 8 publications

References 0 publications

Study of the Effects of Aging Treatment on Astroloy Processed via Hot Isostatic Pressing

Study of the Effects of Aging Treatment on Astroloy Processed via Hot Isostatic Pressing

Hot isostatic pressing of in-situ TiB/Ti-6Al-4V composites with novel reinforcement architecture, enhanced hardness and elevated tribological properties

Hot Isostatic Pressing (HIP) Densification Of Oxide Superconductors

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