Healing Process of Casting Pores in a Ni-based Superalloy by Hot Isostatic Pressing

Zheng, Xiangui; Shi, Ying; Lou, Langhong

doi:10.1016/j.jmst.2015.07.004

Cited by 27 publications

(5 citation statements)

References 15 publications

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“…The middle line, indicated by yellow arrows, represented the meeting interface of the newly-formed fine grains which grew from both sides of the crack. The similar phenomena were also discovered during electro-healing cracks in nickel [14,15]. This implied that the newly-formed fine grains had grown at a nearly identical growth rate from both sides towards the center of the pre-crack.…”

Section: Influence Of the Healing Temperaturesupporting

confidence: 69%

Effect of Parameters on Internal Crack Healing in 30Cr2Ni4MoV Steel for 600-Ton Ultra-Super Ingots

Xin

2017

Metals

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Abstract:The effect of parameters on internal crack healing in 30Cr2Ni4MoV steel for 600-ton ultra-super ingots was systematically investigated. The results show that the degree of crack healing increases with increasing healing temperature, holding time, reduction ratio, and hot pressure, and with decreasing strain rate. Internal crack healing in 30Cr2Ni4MoV steel should be conducted at less than 1200 • C to avoid grain coarsening. Hot pressure, in the high-temperature elastic zone and perpendicular to the crack faces, not only promotes the rapid crack healing, but also prevents grain coarsening of the matrix.

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Section: Influence Of the Healing Temperaturesupporting

confidence: 69%

Effect of Parameters on Internal Crack Healing in 30Cr2Ni4MoV Steel for 600-Ton Ultra-Super Ingots

Xin

2017

Metals

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“…In the manufacturing processes of the high temperature components used in aircraft, Inconel 718 alloy often needs to be hot deformed to meet the strict requirements of microstructure and mechanical properties. The microstructure and mechanical properties is sensitive to the deformation parameters, and the microstructural evolution during the deformation in turn affects the flow behaviors [6]. Thus, it is valuable to understand the flow behaviors and microstructural evolution in the hot deformation of Inconel 718 alloy.…”

Section: Introductionmentioning

confidence: 99%

Precipitation behavior during high-temperature isothermal compressive deformation of Inconel 718 alloy

Zhang

Liu

et al. 2016

Materials Science and Engineering: A

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The precipitation behaviors of γ″ and δ phases during high-temperature isothermal compressive deformation of Inconel 718 alloy are investigated under the strain rate of 2.2·10 -4 s -1 . It is found that the precipitation behaviors are tailored by deformation temperatures, and lead to the disparately abnormal deformation characteristics. Under the deformation temperature of 800 o C, the microstructure is composed of incoherent needle-shaped γ″ precipitates at grain boundaries and ultrafine spherical γ″ particles within grains, resulting in the exceptional decrease of flow stress with absence of DRX. When deformed at 900 o C, it becomes needle-shaped δ precipitates at grain boundaries and intragranular disc-shaped γ″ precipitates, and the DRX softening degree is lowered consequently.

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“…HIP is a process that the high temperature and pressure are imposed to the workpieces to obtain the full-dense components. HIP process has been widely used in castings, and some works have been done on the elimination of the shrinkage cavities in nickel-Finite element simulation of real cavity closure in cast Ti6Al4V alloy during hot isostatic pressing based superalloy by HIP process [7][8][9][10] . However, most of research works focus on the recovery of mechanical property after HIP and few concentrate on the closure process and closure mechanism of shrinkage cavity.…”

Section: Introductionmentioning

confidence: 99%

Finite element simulation of real cavity closure in cast Ti6Al4V alloy during hot isostatic pressing

Yin

et al. 2022

China Foundry

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The healing behavior of shrinkage cavity inside the cast Ti6Al4V alloy during hot isostatic pressing (HIP) was investigated experimentally by interrupted hot isostatic pressing tests. The X-ray micro computed tomography was used to record the morphology changes before and after hot isostatic pressing. The twodimensional geometry obtained by the microCT scan was used in simulation to study the evolution of the real shrinkage cavity during hot isostatic pressing. Shrinkage cavities, shrinkage porosity and small gas pores can be effectively eliminated under proper HIP conditions. The two-dimensional morphology in the simulation results agrees well with the experimental results. This study reveals that plastic deformation, creep and diffusion are the main mechanisms of cavity closure during hot isostatic pressing. In addition, the simplified elliptical pores with aspect ratios at different positions were used to replace the real pores to further study the factors affecting the position of dimples after HIP by simulation. It is found that the position of the dimples mainly depends on the aspect ratio of the elliptical pore and the distance between the pore surface and the external surface of the geometric model.

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Healing Process of Casting Pores in a Ni-based Superalloy by Hot Isostatic Pressing

Cited by 27 publications

References 15 publications

Effect of Parameters on Internal Crack Healing in 30Cr2Ni4MoV Steel for 600-Ton Ultra-Super Ingots

Effect of Parameters on Internal Crack Healing in 30Cr2Ni4MoV Steel for 600-Ton Ultra-Super Ingots

Precipitation behavior during high-temperature isothermal compressive deformation of Inconel 718 alloy

Finite element simulation of real cavity closure in cast Ti6Al4V alloy during hot isostatic pressing

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