Karol Frydrych, Ph.D., Eng.

Department of Mechanics of Materials (ZMM)
Division of Micromechanics of Materials (PMM)
position: specialist
telephone: (+48) 22 826 12 81 ext.: 436
room: 138
e-mail: kfryd

Doctoral thesis
2017-10-26Modelowanie ewolucji mikrostruktury metali o wysokiej wytrzymałości właściwej w procesach intensywnej deformacji plastycznej 
supervisor -- Katarzyna Kowalczyk-Gajewska, Ph.D., Dr. Habil., Eng., IPPT PAN
1258
 
Recent publications
1.Frydrych K., Kowalczyk-Gajewska K., A three-scale crystal plasticity model accounting for grain refinement in fcc metals subjected to severe plastic deformations, MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, ISSN: 0921-5093, DOI: 10.1016/j.msea.2016.01.101, Vol.658, pp.490-502, 2016
Abstract:

A new three-scale model of polycrystal accounting for grain refinement is proposed. The model is embedded into the crystal plasticity framework. With the experimental reference to the development of the dislocation induced cell substructure, a single crystallite in the representative grain aggregate is initially subdivided into subdomains with the crystallographic orientations slightly misoriented with respect to the nominal orientation of a parent grain. The predicted misorientation evolution of subgrains with respect to the reference orientation of a crystallite is an indicator of grain refinement. The correlation between the increase of a misorientation angle and a slip activity pattern is analyzed. The model predictions are compared with available experimental data.

Keywords:

Crystal plasticity, Severe plastic deformation, Grain refinement

Affiliations:
Frydrych K.-IPPT PAN
Kowalczyk-Gajewska K.-IPPT PAN
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
Abstract:

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.

Keywords:

Texture evolution, UFG materials, SPD processes, Crystal plasticity, Twinning

Affiliations:
Kowalczyk-Gajewska K.-IPPT PAN
Sztwiertnia K.-other affiliation
Kawałko J.-other affiliation
Wierzbanowski K.-other affiliation
Wroński M.-other affiliation
Frydrych K.-IPPT PAN
Stupkiewicz S.-IPPT PAN
Petryk H.-IPPT PAN

Conference papers
1.Kowalczyk-Gajewska K., Stupkiewicz S., Frydrych K., Petryk H., Modelling of Texture Evolution and Grain Refinement on Complex SPD Paths, JOURNAL OF PHYSICS: CONFERENCE SERIES, ISSN: 1742-6588, DOI: 10.1088/1757-899X/63/1/012040, No.63, pp.012040-1-10, 2014
Abstract:

A computationally efficient procedure for modelling of microstructural changes on complex and spatially nonuniform deformation paths of severe plastic deformation (SPD) is presented. The analysis follows a two-step procedure. In the first step, motivated by saturation of material hardening at large accumulated strains, the steady-state kinematics of the process is generated for a non-hardening viscoplastic model by using the standard finite element method for a specified SPD scheme. In the second step, microstructural changes are investigated along the deformation-gradient trajectories determined in the first step for different initial locations of a material element. The aim of this study is to predict texture evolution and grain refinement in a non-conventional process of cold extrusion assisted by cyclic rotation of the die, called KOBO process, which leads to an ultra-fine grain structure. The texture evolution is calculated for fcc and hcp metals by applying crystal visco-plasticity combined with the self-consistent scale transition scheme. In parallel, by applying the simplified phenomenological model of microstructure evolution along the trajectories, grain refinement is modelled. The results are compared with available experimental data.

Keywords:

SPD processes, Texture evolution, UFG materials, Crystal plasticity, Grain refinement

Affiliations:
Kowalczyk-Gajewska K.-IPPT PAN
Stupkiewicz S.-IPPT PAN
Frydrych K.-IPPT PAN
Petryk H.-IPPT PAN

Conference abstracts
1.Frydrych K., Kowalczyk-Gajewska K., Modelling microstructure evolution in SPD processes in the framework of crystal plasticity theory, ICTAM XXIV, 24th International Congress of Theoretical and Applied Mechanics, 2016-08-21/08-26, Montréal (CA), pp.1-2, 2016
2.Kowalczyk-Gajewska K., Frydrych K., Modelling of microstructure evolution in metals and alloys of high specific strength, SolMech 2016, 40th Solid Mechanics Conference, 2016-08-29/09-02, Warszawa (PL), No.P196, pp.1-2, 2016
3.Frydrych K., Kowalczyk-Gajewska K., Modelling of texture evolution and grain refinement in metals and alloys of high specific strength in SPD processes, EUROMAT 2015, European Congress and Exhibition on Advanced Materials and Processes, 2015-09-20/09-24, Warszawa (PL), pp.C1.1-1-2, 2015
Abstract:

Texture evolution and grain refinement in materials subjected to severe plastic deformation (SPD), in particular the ECAP and KoBo extrusion processes are examined in this work. The well known ECAP process consists in extruding a billet through an angular channel. In the KOBO process material is extruded with assistance of cyclic rotation of a die. Both processes lead to considerable grain refinement and often to strong texture evolution [2,5]. The VPSC code itself provides different variants of self-consistent (SC) micro-macro transition scheme. It was combined with the proposed crystal plasticity framework and has been used to simulate texture evolution. However, this model is two-scale and does not predict the grain refinement. In order to examine the latter phenomenon three-scale model of microstructure evolution was developed. The model is able to combine two micro-macro transition schemes to simulate the evolution of orientations inside a grain and decide if the formation of subgrains has occurred.

Keywords:

texture evolution, grain refinement, SPD processes, crystal plasticity, micromechanics

Affiliations:
Frydrych K.-IPPT PAN
Kowalczyk-Gajewska K.-IPPT PAN
4.Kowalczyk-Gajewska K., Frydrych K., Maj M., Urbański L., Micromechanical modelling of magnesium alloy and its experimental verification, PCM-CMM 2015, 3rd Polish Congress of Mechanics and 21st Computer Methods in Mechanics, 2015-09-08/09-11, Gdańsk (PL), pp.677-678, 2015
Abstract:

Micromechanical modelling of magnesium alloys is presented. The applied model combines the crystal plasticity framework accounting for twinning with the self-consistent grain-to-polycrystal scale transition scheme. The mechanical response of the material in the experiments involving the strain path changes is studied, together with the prediction of the accompanying texture evolution. It is demonstrated that the evolution of microstructure has an important impact on the overall material behaviour. The model predictions will be verified in experiments performed on the rolled sheets made of AZ31B alloy

Keywords:

micromechanics, crystal plasticity, twinning, texture evolution

Affiliations:
Kowalczyk-Gajewska K.-IPPT PAN
Frydrych K.-IPPT PAN
Maj M.-IPPT PAN
Urbański L.-IPPT PAN
5.Frydrych K., Kowalczyk-Gajewska K., Stupkiewicz S., Modelling of microstructure evolution in hcp polycrystals on non-proportional strain paths, SolMech 2014, 39th Solid Mechanics Conference, 2014-09-01/09-05, Zakopane (PL), pp.207-208, 2014
Abstract:

Microstructure evolution in hcp polycrystals subjected to severe plastic deformation, in particular in the KOBO extrusion and the equal channel angular pressing (ECAP) processes, are examined in this work, using the crystal plasticity framework. Modelling approach combines the large strain crystal plasticity model accounting for twinning and the tangent variant of the self-consistent (SC) scale transition scheme.

Keywords:

hcp polycrystals, twinning, SPD processes, crystal plasticity, self-consistent model, microstructure evolution

Affiliations:
Frydrych K.-IPPT PAN
Kowalczyk-Gajewska K.-IPPT PAN
Stupkiewicz S.-IPPT PAN