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Application of the Digital Material Representation to strain localization prediction in the two phase titanium alloys for aerospace applications

Muszka K., Madej L., Wynne B. P.

Archives of Civil and Mechanical Engineering

2016

Vol. 16, no. 2

224--234

In the present work Digital Material Representation (DMR) approach was utilized to simulate the deformation behavior of the two phase Ti-6Al-4V alloy. DMR models of the two phase structure, containing different morphologies of alpha grains within a beta matrix – lamellar and equiaxed, were created. Each phase was then separated and different mechanical properties were assigned. Subsequently, their response to loading was tested using simple shear numerical simulations with special focus on strain inhomogeneities, as the main driving force for spheroidization is considered to be the formation of intense shearing within alpha lamellae. The proposed modeling approach combining Finite Element Method (FEM) with DMR allowed for much more detailed numerical analysis of deformation behavior of two phase titanium alloys at the micro scale and provided information such as strain localization and stress distributions within the alpha and beta phases. It was showed that presented model offers a new and powerful tool to study the physical bases of microstructure evolution processes such as spheroidization or recrystallization of Ti alloys. It shows good potential in simulation of deformation processes of complex two-phase morphologies that is a crucial step towards optimization of process parameters during hot forming of Ti-6Al-4V alloys.

Skutki obróbki laserowej warstwy wierzchniej elementów ze stopów tytanu oraz aluminium

Wołyński A.

Journal of Research and Applications in Agricultural Engineering

2004

Vol. 49, nr 3

53-56

W referacie przedstawiono efekty obróbki laserowej warstwy wierzchniej próbek ze stopu tytanu Ti6Al4V oraz stopu aluminium AlSi6Cu4. Obróbkę przeprowadzono przy użyciu lasera C02. W wyniku tej obróbki w próbce Ti6Al4V uzyskano wzrost twardości w warstwie przetopionej i w warstwie zahartowanej, natomiast w próbce AlSi6Cu4 uzyskano mniejsze przyrosty twardości, z równoczesnym powstawaniem pęcherzy gazowych w obszarze oddziaływania ciepła.

Paper presents effects of laser treatment of surface layer of samples made of titanium alloy, Ti6Al4V and aluminium alloy, AlSi6Cu4. Laser treatment was carried out by means of a CO2 laser. In the titanium alloy Ti6Al4V, hardness increase in the zone melted by the laser beam is larger than in the zone that has only been hardened by the beam. Advantageous effects of laser treatment of the AlSi6Cu4 alloy have been obtained at a very low power density of the laser beam applied. Increase of the density causes formation of gas bubbles in the heat affected area.