Instytut Podstawowych Problemów Techniki
Polskiej Akademii Nauk

Partnerzy

Jakub Kawałko


Ostatnie publikacje
1.  Tabin J., Nalepka K.T., Kawałko J., Brodecki A., Bała P., Kowalewski Z.L., Plastic Flow Instability in 304 Austenitic Stainless Steels at Room Temperature, METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, ISSN: 1073-5623, DOI: 10.1007/s11661-023-07223-5, pp.1-6, 2023

Streszczenie:
A remarkable plastic flow instability is observed during tensile deformation of the commercial 304 stainless-steel sheet at room temperature. It has been found that the occurrence of plastic flow instability in 304 is dependent on the strain rate and specimen gage length. Moreover, it is essentially the same as the necking caused by plastic instability in 316L. However, the enhanced strain hardening resulting from deformation-induced martensitic transformation facilitates the orderly propagation of the strain-localized band.

Afiliacje autorów:
Tabin J. - IPPT PAN
Nalepka K.T. - inna afiliacja
Kawałko J. - inna afiliacja
Brodecki A. - IPPT PAN
Bała P. - AGH University of Science and Technology (PL)
Kowalewski Z.L. - IPPT PAN
200p.
2.  Kowalczyk-Gajewska K., Sztwiertnia K., Kawałko J., Wierzbanowski K., Wroński M., Frydrych K., Stupkiewicz S., Petryk H., Texture evolution in titanium on complex deformation paths: Experiment and modelling, MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, ISSN: 0921-5093, DOI: 10.1016/j.msea.2015.04.040, Vol.637, pp.251-263, 2015

Streszczenie:
Texture evolution in commercially pure titanium deformed by equal-channel angular pressing (ECAP) and extrusion with forward–backward rotating die (KoBo) is studied both experimentally and numerically. New results are provided that demonstrate the effects of distinct and complex deformation paths on the texture in the ultra-fine grained (UFG) material obtained after severe plastic deformation (SPD). The numerical simulations are based on the self-consistent viscoplastic method of grain-to-polycrystal scale transition. A recently proposed modification of the probabilistic scheme for twinning is used that provides consistent values of the twin volume fraction in grains. The basic components of the experimentally observed texture are reasonably well reproduced in the modelling. The numerical simulations provide an insight into the internal mechanisms of plastic deformation, revealing substantial activity of mechanical twinning in addition to the basal and prismatic slip in titanium processed by ECAP.

Słowa kluczowe:
Texture evolution, UFG materials, SPD processes, Crystal plasticity, Twinning

Afiliacje autorów:
Kowalczyk-Gajewska K. - IPPT PAN
Sztwiertnia K. - inna afiliacja
Kawałko J. - inna afiliacja
Wierzbanowski K. - inna afiliacja
Wroński M. - inna afiliacja
Frydrych K. - IPPT PAN
Stupkiewicz S. - IPPT PAN
Petryk H. - IPPT PAN
35p.

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