Abstract
A cell model is presented and numerical analyses are implemented to find the distribution of thermally induced stress, thermally induced deformation and the effect of the tungsten volume fraction during a single step of the quenching process for a 2-dimensional cell model and to find the strengthening mechanisms through the cyclic heat treatment of tungsten alloys. The thermal stresses induced from a single step of quenching mostly concentrated on the W/matrix interface and WAV grain boundary region and the stresses were distributed locally in tensile and locally in the compressible state both in matrix and particle. The mechanism of matrix phase formation at tungsten-tungsten boundaries during cyclic heat-treatment was found to be due to the combination effect of the super saturated matrix phase precipitation into WAV grain boundaries and the thermal stresses state. These results enhance the impact energy enhancement in tungsten heavy alloys.
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