Development of Temperature-Rate Modes of Hot Deformation of the Co–28Cr–6Mo Alloy Based on Processing Maps

Gamin, Yu. V.; Korotitskiy, Andrey; Kin, T. Yu.; Галкин, С. П.; Kostin, S. A.; Tikhomirov, E. O.

doi:10.3103/s0967091222110079

Cited by 5 publications

(3 citation statements)

References 27 publications

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“…On the other hand, high strain rates can lead to reduced ductility and cracking during the forging process. According to processing maps [30], the most preferred deformation mode for the Co-28Cr-6Mo alloy was strain rates from 1 to 5 s −1 . The strain rate field at the end of each main step of forging at simulation is shown in Figure 8.…”

Section: Results Of Computer Simulationmentioning

confidence: 99%

“…Many factors influence the kinetics of DRX, including stacking fault energy (SFE), conditions of thermomechanical treatment (TMT), initial grain size, chemical composition of the material, precipitation of the secondary phases, and others [27][28][29]. Earlier, the study of the deformation behavior of Co-Cr-Mo alloy and the construction of processing maps for the determination of temperature-speed parameters of hot deformation were carried out [30]. It has been shown that the most optimal thermo-deformation modes are low strain rates of less than 5 s −1 and temperatures above 1100 • C. Thus, isothermal forging can be a technological solution for the production of an intermediate product for subsequent deformation processing and obtaining a high-quality microstructure that excludes casting defects.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Microstructure Evolution of Co-Cr-Mo Alloy during Isothermal Forging

Gamin,

Skugorev,

Karashaev

et al. 2023

Metals

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The article analyzes the microstructure evolution of Co-Cr-Mo alloy during isothermal forging. The process of isothermal forging can be a technological solution to produce a semi-finished product for subsequent deformation processing and obtain a high-quality microstructure that excludes casting defects. Based on analysis of microstructure and phase composition and calculations, the required modes of ingot homogenization are determined. Finite element method simulation of the forging has shown that temperature and deformation conditions make deformation in the single-phase γ-region possible. However, at lower temperatures, σ-phase particles may precipitate at the last steps of deformation. After isothermal forging and water quenching, a mixture of recrystallized and polygonized structures with an average grain size of 5–10 μm and precipitation of ultra-fine dispersed particles of σ-phase (~0.13 μm) at grain boundaries are formed. Isothermal forging in the temperature range of 1100–1200 °C and at low strain rates of up to 1 s−1 allows obtaining a microstructure without pores, cracks, and large inclusions. Thus, it makes it possible to use the forging billet for further deformation by different metal forming methods.

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Section: Results Of Computer Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of Microstructure Evolution of Co-Cr-Mo Alloy during Isothermal Forging

Gamin,

Skugorev,

Karashaev

et al. 2023

Metals

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“…When changing any of the parameters, the remaining parameters were taken according to the basic variant. The parameter variation is based on the analysis of the strain-speed parameters of the Co-Cr-Mo alloy presented in [21], as well as on the technical characteristics of industrial RSR minimills [22].…”

Section: Methodsmentioning

confidence: 99%

Numerical simulation of workpiece temperature field during radial shear rolling of biomedical Co-Cr-Mo alloy

Kin

Gamin

Галкин

et al. 2023

Modelling Simul. Mater. Sci. Eng.

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This paper describes the analysis of temperature field of workpiece during radial shear rolling (RSR) of biomedical Co-28Cr-6Mo alloy. In the process of hot metal forming, the temperature distribution in the deformation zone has a significant influence on the quality and properties of the final product. In some cases, the deformation within a narrow temperature range is required to provide the desired properties. To obtain data on change in temperature, the computer simulation of RSR was carried out using finite element method (FEM). According to simulation results, the temperature distribution of bar depending on the variable process parameters such as temperature of workpiece, rotary velocity of rolls, elongation ratio, diameter of workpiece, and temperature of tool was evaluated. It was determined that the most significant parameters influencing on the distribution of the temperature field are the workpiece heating temperature and the rolling speed. The RSR process makes it possible to effectively manage the distribution of temperature field due to selecting technological parameters and, thereby, control the formation of the alloy structure. The data obtained can be useful for developing the modes of RSR of Co-Cr-Mo alloy.

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Improving the production technology of cast billets for gas turbine engine blades

Chut,

Sheshenin,

Morozova

et al. 2024

Metallurgist

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Development of Temperature-Rate Modes of Hot Deformation of the Co–28Cr–6Mo Alloy Based on Processing Maps

Cited by 5 publications

References 27 publications

Analysis of Microstructure Evolution of Co-Cr-Mo Alloy during Isothermal Forging

Analysis of Microstructure Evolution of Co-Cr-Mo Alloy during Isothermal Forging

Numerical simulation of workpiece temperature field during radial shear rolling of biomedical Co-Cr-Mo alloy

Improving the production technology of cast billets for gas turbine engine blades

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