Effect of high pressure on the solid–liquid phase change of a nickel base superalloy during hot isostatic pressing

Kim, Min Tae; Oh, O.Y.

doi:10.1016/j.jallcom.2008.10.117

Cited by 14 publications

(3 citation statements)

References 19 publications

(30 reference statements)

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“…(Similar patterns were obtained for TB08, and thus are not shown in this figure) There are six dominant diffraction peaks displayed, of which three peaks, located around 43°, 50° and 75°, are characteristic ones for nickel [22], as is confirmed by the pattern obtained for the uncoated blade before the oxidation test (uncoated:BOx).…”

supporting

confidence: 74%

In-situ deposition of silica layers during the operation of a micro-gas turbine and their effect on the oxidation of superalloy blades

Kim

2010

Met. Mater. Int.

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Silica-based oxide layers were deposited in-situ on turbine blades made from Inconel 713 during the operation of a 13 kgf-class gas turbine, and their effect on the ex-situ oxidation behavior of the blades at 1050°C was examined. The two turbines were driven by burning liquid petroleum gas (LPG), one turbine at a rotation speed of 35,000 rpm for 4 h (TB04), and the other at 42,000 rpm for 8 h (TB08). For deposition, tetraethylorthosilicate (TEOS) was sprayed into the fuel line immediately ahead of the combustion chamber. The TEOS-to-LPG ratio for TB04 and TB08 was maintained at 5.4 wt.% and 2.3 wt.%, respectively. Directly after operation, the turbine blades were coated with silica layers to a thickness of ~10 µm, independent of the operating conditions. These oxide layers on the blades provided excellent protection against oxidation during both operation and the ex-situ isothermal oxidation test.

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confidence: 74%

In-situ deposition of silica layers during the operation of a micro-gas turbine and their effect on the oxidation of superalloy blades

Kim

2010

Met. Mater. Int.

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“…One drawback of investment casting is that solidifying segregation and microporosities in the casting are unavoidable which will decrease the mechanical properties at high temperature. Hot isostatic pressing (HIP) is an effective technology used for reducing solidifying segregation and microporosities of materials or components [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Effect of Hot Isostatic Pressing on Microstructures and Mechanical Properties of IN738LC Superalloy

et al. 2017

MSF

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The microstructures and mechanical properties of IN738LC superalloy made by investment castings followed by Hot Isostatic Pressing (HIP) treatment have been investigated. The results revealed that after HIP treatment, the microporosities have been almost removed and the density rose by 0.21%. The eutectic size became smaller and the fraction decreased. The γ' phase was more regular and also increased in size, while a large number of secondary γ' phase appeared. With HIP treatment, the impact toughness increased from 5.0J ~ 7.0J to 8J ~ 9J and tensile strength at 200°C ~ 800°C was improved by approximately 3.2%~19.7%. In addition, the ductility and the stress rupture life have also been greatly improved as well.

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“…Many researchers have been working on the relationship between pressure and time during the HIPing process for different materials [11][12][13]. Arzt and Ashby [8] studied the effect of pressure and time on relative density for superalloys.…”

Section: Introductionmentioning

confidence: 99%

A Novel Forming Process for Powder Metallurgy of Superalloys

Bai

Lin

Tian

et al. 2014

KEM

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Powder metallurgy (PM) of nickel-based superalloys has been used for a wide range of products owing to their excellent special properties in processing and applications. Typical processes for high performance PM superalloys include hot isostatic pressing, hot extrusion and hot isothermal forging. Hot isostatic pressing is normally conducted at a high temperature, by using a low pressure for a long time in a closed vessel, resulting in high cost and low product efficiency. In this paper a novel forming process, i.e. direct powder forging for powder metallurgy of superalloys has been proposed. In this process, the encapsulated and vacuumed powder is heated up to the forming temperature and forged directly to the final shape, by using a high forming load for a very short time. Direct powder forging is a low-cost and energy-saving process compared to conventional PM processes, and in addition, press machines of conventional forging can be used for direct powder forming process. In direct powder forging it is important to control the relative density of the deformed part since the existence of voids could reduce the mechanical strength and fatigue life. In this paper, feasibility tests of direct powder forging are presented. Microstructure, relative density and hardness of the formed specimen were studied.

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Effect of high pressure on the solid–liquid phase change of a nickel base superalloy during hot isostatic pressing

Cited by 14 publications

References 19 publications

In-situ deposition of silica layers during the operation of a micro-gas turbine and their effect on the oxidation of superalloy blades

In-situ deposition of silica layers during the operation of a micro-gas turbine and their effect on the oxidation of superalloy blades

Effect of Hot Isostatic Pressing on Microstructures and Mechanical Properties of IN738LC Superalloy

A Novel Forming Process for Powder Metallurgy of Superalloys

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