Abstract
The paper deals with a theoretical and experimental study of the relationship between the microstructural parameters, mechanical properties, and impact deformation and fracture of steels using the example of 17Mn1Si pipe steel. A model for the behavior of a polycrystalline grain conglomerate under impact loading at different temperatures was proposed within a cellular automata framework. It was shown that the intensity of dissipation processes explicitly depends on temperature and these processes play an important role in stress relaxation at the boundaries of structural elements. The Experimental study reveals the relationship between pendulum impact test temperature and the deformation/fracture energy of the steel. The impact toughness was shown to decrease almost linearly with the decreasing test temperature, which agrees with the fractographic analysis data confirming the increase in the fraction of brittle fracture in this case. It was shown with the aid of the proposed model and numerical simulations that the use of the excitable cellular automata method and an explicit account of test temperature through the possibility of energy release at internal interfaces help to explain the experimentally observed features of impact failure at different temperatures.
Highlights
The study of the deformation behavior of structurally heterogeneous materials within the physical mesomechanics framework [1] involves the formulation of hierarchical models that take into account the relationship between different-scale processes
To describe the transformation of real grain boundaries, we have developed an algorithm of bistable cellular automata using a fuzzy set theory
A model for the behavior of a grain conglomerate under impact loading at different temperatures was proposed within a cellular automata framework
Summary
The study of the deformation behavior of structurally heterogeneous materials within the physical mesomechanics framework [1] involves the formulation of hierarchical models that take into account the relationship between different-scale processes. Of particular importance is the study of the local material response at the mesoscale level where stresses and strains are distributed very inhomogeneously. This is stress/strain heterogeneity is caused by a large number of interface/grain boundaries as well as by specific heterogeneous nucleation and storage of deformation defects [2,3,4,5,6,7,8]. A pre-defined structural level of deformation is associated naturally with a free surface where deformation takes place first [12,13,14,15,16].
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