|
ИСТИНА |
Войти в систему Регистрация |
ИСТИНА ИНХС РАН |
||
A phase field formulation of the coupled effects of defect generation and large strains on microstructure evolution during laser-based additive manufacturingстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Дата последнего поиска статьи во внешних источниках: 12 августа 2020 г.
- Авторы: Mirzade F.Kh, Islamov R.Sh
- Сборник: 2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL)
- Год издания: 2019
- Место издания: IEEE IEEE Xplore
- Первая страница: 342
- Последняя страница: 347
- DOI: 10.1109/CAOL46282.2019.9019579
- Аннотация: A thermodynamically consistent phase field model accounting for coupled effects of large strains, heat diffusion and atomic defect (vacancy and interstitial atom) generation at moving liquid-solid interface is presented to describe microstructure development during laser powder-bed fusion additive manufacturing (AM) of metals. Our model equations, including the Ginsburg-Landau equation for the phase field with stress terms, diffusion-drift Cahn–Hilliard equation, describing atomic defect dynamics, an energy balance equation for the temperature change, and finally the elasticity equation for the displacement fields are derived under a thermodynamic frame based on entropy generation. To describe the effects of temperature gradient and fluid velocity distributions and thermal history on the defect dynamics during microstructure formation a linking of microscale model with the macroscopic AM processing conditions is discussed. Then isothermal equilibrium situation is considered to study diffusion-flexural instability due to defect-strain positive feedback in nanolayers with surface elasticity effects. The influence of defect clustering due to this instability on the periodic exfoliation of deposited layers on a substrate is also discussed.
- Добавил в систему: Мирзаде Фикрет Хансуварович