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- W4311164378 abstract "In the article, the tests of the medical alloy Co – 28Cr – 6Mo after homogenization for uniaxial compression at temperatures of 1000, 1100 and 1200 °C and strain rates of 1, 10, and 50 s –1 were carried out using the Gleeble System 3800. The stress-strain curves describing the alloy deformation behavior were obtained. The calculations of hot deformation parameters (activation energy, Zener-Hollomon parameter) were performed using three models (power-law, exponential, and hyperbolic sine function) describing the flow stress. The highest degree of convergence was shown by the calculation results based on the power function and the hyperbolic sine function. These models can be used to accurately calculate the flow stress at given temperature and strain rate parameters, or to simulate the deformation process. Also, based on processing maps, the authors developed the deformation-speed modes of hot deformation of the Co – 28Cr – 6Mo alloy. It will make it possible to choose the optimal rolling modes in the future. According to the data obtained, favorable temperature-speed conditions for hot deformation are shifted as deformation accumulates to the region of high temperatures and low strain rates. At the same time, the extremely unfavorable zone with negative values of the ξ-criterion, which appears at e = 0.3 – 0.4, continues to grow quite significantly with an increase in the deformation effect. Hot deformation of the Co – 28Cr – 6Mo alloy at low compression ratios ( e < 0.2) is more expedient to perform at temperatures above 1150 °C and strain rates of at least 20 s –1 . With an increase in deformation degree, it is necessary to choose lower strain rates (1 – 5 s –1 ) and higher deformation temperature." @default.
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- W4311164378 date "2022-11-22" @default.
- W4311164378 modified "2023-10-13" @default.
- W4311164378 title "Development of temperature-speed modes of hot deformation of Co – 28Cr – 6Mo alloy based on processing maps" @default.
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- W4311164378 doi "https://doi.org/10.17073/0368-0797-2022-11-786-797" @default.
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