PSI - Issue 6

Yu.V. Petrov et al. / Procedia Structural Integrity 6 (2017) 265–268 Author name / StructuralIntegrity Procedia 00 (2017) 000 – 000

268

4

treatment of the steel it was nanostructured) and the disappearance of yield stress under the static influence. So, quantitative changes in the yield point were not observed. The different values of the characteristic relaxation time of stresses for different treatments is possible to connect with structural changes that influence the temporal sensitivity of material (measured in terms of the characteristic time) to the frequency of load.

Fig. 1. The prediction of process of accumulation of residual deformation for quenched steel 50 Makarov et al. (2014) after 1 – heat treatment ( μs 320   ) and 2 – combined strain-heat treatment ( μs 140   ) based on proposed analytical model of cyclic loading Acknowledgements

The work was supported by the Russian Science Foundation (grant 17-11-01053).

References

Gruzdkov, A.A., Petrov, Yu.V., 1999. On temperature time correspondence in high-rate deformation of metals. Doklady Physics. 44 (2), 114 – 116. Gruzdkov, A.A., Petrov, Yu.V., Smirnov, V.I., 2002. An invariant form of the dynamic criterion for yield of metals. Physics of the Solid State 44 (11), 2080 – 2082. Gruzdkov, A.A., Sitnikova E.V., Morozov N.F., Petrov Y.V. 2009. Thermal effect in dynamic yielding and fracture of metals and alloys. Mathematics and Mechanics of Solids, 14, (1-2), 72-87. Petrov, Yu.V., Borodin, E.N., 2015. Relaxation mechanism of plastic deformation and its justification using the example of the sharp yield point phenomenon in whiskers. Physics of the Solid State. 57 (2), 353 – 359. Borodin, E.N., Mayer, A.E., Petrov, Y.V., Gruzdkov, A.A., 2014. Maximum yield strength under quasi-static and high-rate plastic deformation of metals. Physics of the Solid State, 56. (12), 2470 – 2479. Selyutina, N., Borodin, E.N., Petrov, Y., Mayer, A.E., 2016. The definition of characteristic times of plastic relaxation by dislocation slip and grain boundary sliding in copper and nickel. International Journal of Plasticity, 82, 97 – 111. Borodin, E.N., Selyutina, N.S., Petrov, Yu.V., 2016. Determining characteristic plastic-relaxation times using micro- and nanocrystalline nickel as an example. Doklady. Physics, 61. (3), 143 – 146. Makarov, A.V., Savrai, R.A., Gorkunov, E.S., Yurovskikh, A.S., Malygina, I.Yu, Davydova, N.A., 2014. Structure, mechanical characteristics, and deformation and fracture peculiarities of quenched structural steel under cyclic loading after combined strain-heat nanostructuring treatment. Physical mesomechanics. 17 (1), 5 – 20.