The significance of spatial length scales and solute segregation in strengthening rapid solidification microstructures of 316L stainless steel

Different Response of Cast and 3D-Printed Co-Cr-Mo Alloy to Heat Treatment: A Thorough Microstructure Characterization

“…All the microstructural features are indicated in Figure 1. Such microstruc ture is typical for many alloys prepared by SLM [30][31][32]. The morphology of columna grains is related to the epitaxial growth of grains from the previously solidified layer.…”

Захват Примеси В Разбавленном Растворе: Фазово-Полевое Моделирование Затвердевания

“…Основной вывод, который следует из прямого численного моделирования EFKP-модели, состоит в том, что модель имеет ряд преимуществ как по сравнению с предшествующими фазово-полевыми моделями затвердевания [25][26][27][28], которые до сих пор используются для изучения микроструктуры материалов [39,40], так и по сравнению с новыми моделями [7][8][9]. Во-первых, по сравнению с известной моделью Уилера−Беттингера−Макфаддена [25,26] наблюдается более правильное поведение коэффициента распределения, хотя EFKP-модель тоже нуждается в доопределении, позволяющем решить проблему с возникновением k(V ) > 1.…”

Mechanical Properties and Deformation Behavior of Additively Manufactured 316L Stainless Steel (FY2020)

“…Furthermore, each rapid heating-cooling cycle occurs in a small local volume of the material which can induce an intense thermal stress field. This can result in a high-density dislocation network, often with a well-developed cellular structure [4][5][6][7]. The as-built 316L SS, therefore, shows a unique mechanical behavior that differs from those of annealed austenitic SSs.…”

“…Austenitic SSs like grade 316L SS processed using conventional metallurgical techniques are widely used in nuclear power plants because they provide a good combination of strength, ductility, and corrosion resistance. Additive manufacturing of such alloys has also been studied extensively in recent years for application to nuclear reactor components; it has been observed to have increased room temperature (RT) yield strength but less work hardening due to a characteristic microstructure of fine grains and dislocation cells formed during the localized rapid solidification [4][5][6][7]. On the other hand, the fracture toughness of AM 316L SS could be negatively affected by the increased porosity from the build process, structural anisotropy relative to the build direction, and inclusions from impurities in the feedstock powder [2,8].…”