Abstract
In the present investigation a general model for predicting the influence of a complex stress state on the martensite start temperature of polycrystalline materials is proposed. An analytical equation linking the martensite start temperature and the principal stresses has been derived. It has been established that the martensite start temperature depends only on maximum and minimum principal stresses and is independent of the intermediate principal stress. Analytical relationships for the habit plane orientation of the first martensite plates to form have also been derived. The possible habit planes were found to be parallel to the direction of the intermediate principal stress. In cases where the magnitude of the stresses acting leads to relatively small changes in martensite start temperature, the general model can be simplified so that the shift in martensite start temperature can be presented as a linear function of maximum and minimum principal stresses.
Published Version
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