Complete precipitate dissolution during adiabatic shear localisation in a Ni-based superalloy

Abstract The causes of plane crashes, stemming from the subcritical growth of fatigue cracks, are examined. It is found that the crashes occurred mainly because of the negligence of the defects arising in the course of secondary metalworking processes. It is shown that it is possible to prevent such damage, i.e. voids, wedge cracks, grain boundary cracks, adiabatic shear bands and flow localization, through the use of processing maps indicating the ranges in which the above defects arise and the ranges in which safe deformation mechanisms, such as deformation in dynamic recrystallization conditions, superplasticity, globularization and dynamic recovery, occur. Thanks to the use of such maps the processes can be optimized by selecting proper deformation rates and forming temperatures.

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Implementation of Schoenfield-Wright Failure Criterion into a Three-Dimensional Adiabatic Shear Band Model in CTH

10.21236/ada428732 ◽

2004 ◽

Cited By ~ 2

Author(s):

Muge Fermen-Coker

Keyword(s):

Shear Band ◽

Failure Criterion ◽

Adiabatic Shear Band ◽

Three Dimensional ◽

Adiabatic Shear ◽

Band Model

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Numerical simulation of adiabatic shear bands formation processes on two-dimensional eulerian meshes

Journal of Physics Conference Series ◽

10.1088/1742-6596/1686/1/012035 ◽

2020 ◽

Vol 1686 ◽

pp. 012035

Author(s):

R V Muratov ◽

N A Kudryashov ◽

P N Ryabov

Keyword(s):

Numerical Simulation ◽

Shear Bands ◽

Adiabatic Shear ◽

Formation Processes ◽

Two Dimensional ◽

Adiabatic Shear Bands

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Adiabatic shear bands formation in polycrystalline aluminium

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/1121/1/012007 ◽

2021 ◽

Vol 1121 (1) ◽

pp. 012007

Author(s):

I Mania ◽

H Paul ◽

R Chulist ◽

P Petrzak

Keyword(s):

Shear Bands ◽

Adiabatic Shear ◽

Adiabatic Shear Bands

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Effect of Inertial on the Adiabatic Shear Instability: Numerical Analysis

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/740/1/012145 ◽

2020 ◽

Vol 740 ◽

pp. 012145

Author(s):

Jiejian Liu ◽

Genwei Wang

Keyword(s):

Numerical Analysis ◽

Adiabatic Shear ◽

Shear Instability ◽

Adiabatic Shear Instability

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Changes in Microstructure of Biomedical Co-Cr-Mo-C Alloys with Solution Treating and Aging

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.89-91.377 ◽

2010 ◽

Vol 89-91 ◽

pp. 377-382 ◽

Cited By ~ 2

Author(s):

S. Mineta ◽

Shigenobu Namba ◽

Takashi Yoneda ◽

Kyosuke Ueda ◽

Takayuki Narushima

Keyword(s):

Solution Treatment ◽

Heating Time ◽

Treatment Temperature ◽

Vacuum Furnace ◽

Solution Treatment Temperature ◽

Precipitate Dissolution ◽

Heat Treated ◽

M23c6 Type ◽

Type Carbide ◽

Time Required

Microstructural changes occurring in biomedical Co-Cr-Mo alloys with three carbon levels due to solution treatment and aging were investigated. Ingots of Co-Cr-Mo alloys with three different carbon levels were prepared by vacuum furnace melting; their chemical composition was Co-28Cr-6Mo-xC (x = 0.12, 0.25 and 0.35 mass%). Precipitates were electrolytically extracted from as-cast and heat-treated alloys. An M23C6 type carbide and a phase were detected as precipitates in as-cast Co-28Cr-6Mo-0.12C alloy, and an M23C6 type carbide and an  phase (M6C-M12C type carbide) were detected in as-cast Co-28Cr-6Mo-0.25C and Co-28Cr-6Mo-0.35C alloys. Only the M23C6 type carbide was detected during solution treatment. Complete precipitate dissolution occurred in all the three alloys after solution treatment. The holding time required for complete precipitate dissolution increased with increasing carbon content and decreasing solution treatment temperature. Complete precipitate dissolution occurred in the Co-Cr-Mo-C alloys solution treated at 1523 K for 43.2 ks; they were then subjected to aging from 873 to 1473 K for a heating time up to 44.1 ks after complete precipitate dissolution in solution treatment at 1523 K for 43.2 ks. The M23C6 type carbide with a grain size of 0.1–3 m was observed after aging. A time-temperature-precipitation diagram of the M23C6 type carbide formed in the Co-28Cr-6Mo-0.25C alloy was plotted.

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