Influence of microcracks on Poisson's ratio during plastic deformation of austenitic steel
Kirikov S. V. 1, Mishakin V. V. 1, Klyushnikov V. A. 1
1Mechanical Engineering Research Institute of RAS – branch of Federal State Budgetary Scientific Institution "Federal Research Center The Institute of Applied Physics of the RAS", Nizhny Novgorod, Russia
Email: imndt31@mts-nn.ru

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We researched the influence of damage accumulation on the Poisson's ratio measured by echo-pulse acoustic method during plastic deformation of 12Kh18N10T steel. On the basis of the obtained experimental data we calculated the partial contributions to the change in the Poisson's ratio of damage accumulation and formation of the strain induced martensite phase. The characteristics of stable cracks forming near strain-induced martensite particles at small degrees of plastic strain have been analyzed by computer simulation. The theoretical dependence of the change in the Poisson's ratio due to crack formation during plastic deformation has been constructed. A good agreement between the experimental data and theoretical calculations has been obtained. Keywords: plastic deformation, austenitic steel, Poisson's ratio, martensite transformation, dislocation, mesodefect, configurational force method.
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