Numerical simulation and experimental study on effect of cooling rate on microstructure and strength of nanostructured materials

Hai Nguyen; Duc Le; Quyen Hoang; Pham Quang

doi:10.15625/2525-2518/18571

Author affiliations

Authors

Nguyen Hong Hai Faculty of Materials Engineering, School of Materials Science and Engineering, Hanoi University of Science and Technology, No.1 Dai Co Viet, Ha Noi, Viet Nam
Le Minh Duc Department of Materials Science and Engineering, Faculty of Mechanical Engineering, Le Quy Don Technical University, No. 236 Hoang Quoc Viet, Ha Noi, Viet Nam
Hoang Thi Ngoc Quyen Faculty of Materials Engineering, School of Materials Science and Engineering, Hanoi University of Science and Technology, No.1 Dai Co Viet, Ha Noi, Viet Nam
Pham Quang Faculty of Materials Engineering, School of Materials Science and Engineering, Hanoi University of Science and Technology, No.1 Dai Co Viet, Ha Noi, Viet Nam

DOI:

https://doi.org/10.15625/2525-2518/18571

Keywords:

aluminium based, Al–Mn series, nanostructured, metallic glass, cooling rate, solidification, FEM simulation, Abaqus/Standard, uncoupled heat transfer analysis

Abstract

In this study, by numerical simulation (finite element method, FEM) and experimental, the cooling rate was investigated by changing the product thickness (20, 3, 2, 1, 0.5 and 0.3) mm of Al based two-phase nanostructured materials casted through a copper mold. The effect of cooling rate on the microstructure and strength of the alloy was studied. The Experimental results showed that the precipitated intermetallic phases have a decreasing size corresponding to the increasing cooling rates by simulation from ~10²K/s to ~10⁴K/s. The results show that an appropriate cooling rate can improve the microstructure and properties of the alloy. The Abaqus/Standard capability for uncoupled heat transfer analysis was intended to model solid body heat conduction with general, temperature-dependent conductivity; internal energy (including latent heat effects); and quite general convection and radiation boundary conditions. This study describes the basic energy balance, constitutive models, boundary conditions, finite element discretization, and time integration procedures used. The time step used an automatic algorithm through the smallest tolerance. The maximum temperature change was allowed over a period and the increment was adjusted for this parameter, as was the rate of convergence in the non-linear cases. First-order heat transfer elements used the rule of numerical integration with integrated stations located at the corners of the element for thermal capacitance terms. (Jacobian terminology). This approach is particularly effective when there is a strong latent thermal effect. Thus, first - order elements were used in the case of latent heat. The HEATCAP element is available for single - point pooled thermal capacitance modeling. Centralized film loading options between the mold and the casting were specified by the user.

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