Ústav fyziky materiálů AV ČR, v. v. i. > Zaměstnanci > Polák Jaroslav

prof. RNDr. Jaroslav Polák, DrSc., dr. h. c.

Místnost111
Telefon+420 532 290 366
E-mail[javascript protected email address]
Researcher IDB-3772-2009
Pozicevědecký pracovník - Skupina nízkocyklové únavy, vědecký pracovník - Pokročilé kovové materiály a kompozity na bázi kovů


2020

Polák J., Petráš R.: Cyclic plastic response and damage mechanisms in superaustenitic steel Sanicro 25 in high temperature cycling - Effect of tensile dwells and thermomechanical cycling. Theor. Appl. Fract. Mech. 108 (2020) 102641



2019

Polák J., Petráš R.: Cyclic plastic response and damage in superaustenitic steel in high temperature cycling with dwells and in thermomechanical cycling. Procedia Struct. Integr. 23 (2019) 275-280

Mazánová V., Heczko M., Škorík V., Chlupová A., Polák J., Kruml T.: Microstructure and martensitic transformation in 316L austenitic steel during multiaxial low cycle fatigue at room temperature. Mater. Sci. Eng. A 767 (2019) 138407

Polák J.: Initiation and Early Growth of Fatigue Cracks. TMS 2019 Supplemental Proceedings 0 (2019) 1125-1135



2018

Petráš R., Polák J.: Damage mechanism in austenitic steel during high temperature cyclic loading with dwells. Int. J. Fatigue 113 (2018) 335-344

Polák J., Mazánová V., Petráš R., Heczko M.: Early damage and fatigue crack initiation at ambient and elevated temperatures in heat resistant austenitic steel. MATEC Web Conf. 165 (2018) 04008

Man J., Järvenpää A., Jaskari M., Kuběna I., Fintová S., Chlupová A., Karjalainen L., Polák J.: Cyclic deformation behaviour and stability of grain-refined 301LN austenitic stainless structure. MATEC Web Conf. 165 (2018) 06005

Heczko M., Esser B., Smith T., Beran P., Mazánová V., McComb D., Kruml T., Polák J., Mills M.: Atomic resolution characterization of strengthening nanoparticles in a new high-temperature-capable 43Fe-25Ni-22.5Cr austenitic stainless steel. Mater. Sci. Eng. A 719 (2018) 49-60

Mazánová V., Heczko M., Polák J.: Fatigue crack initiation and growth in 43Fe-25Ni-22.5Cr austenitic steel at a temperature of 700°C. Int. J. Fatigue 114 (2018) 11-21

Mazánová V., Polák J.: Initiation and growth of short fatigue cracks in austenitic Sanicro 25 steel. Fatigue Fract. Eng. Mater. Struct. 41 (2018) 1529-1545

Wärner H., Calmunger M., Chai G., Polák J., Petráš R., Heczko M., Kruml T., Johansson S., Moverare J.: Fracture and Damage Behavior in an Advanced Heat Resistant Austenitic Stainless Steel During LCF, TMF and CF. Procedia Struct. Integr. 13 (2018) 843-848



2017

Polák J., Mazánová V., Heczko M., Kuběna I., Man J.: Profiles of persistent slip markings and internal structure of underlying persistent slip bands. Fatigue Fract. Eng. Mater. Struct. 40 (2017) 1101-1116

Mazánová V., Škorík V., Kruml T., Polák J.: Cyclic response and early damage evolution in multiaxial cyclic loading of 316L austenitic steel. Int. J. Fatigue 100 (2017) 466-476

Man J., Smaga M., Kuběna I., Eifler D., Polák J.: Effect of metallurgical variables on the austenite stability in fatigued AISI 304 type steels. Eng. Fract. Mech. 185 (2017) 139-159

Polák J., Mazánová V., Heczko M., Petráš R., Kuběna I., Casalena L., Man J.: The role of extrusions and intrusions in fatigue crack initiation. Eng. Fract. Mech. 185 (2017) 46-60

Heczko M., Esser B., Smith T., Beran P., Mazánová V., Kruml T., Polák J., Mills M.: On the origin of extraordinary cyclic strengthening of the austenitic stainless steel Sanicro 25 during fatigue at 700 C. J. Mater. Res. 32 (2017) 4342-4353

Hutař P., Poduška J., Šmíd M., Kuběna I., Chlupová A., Náhlík L., Polák J., Kruml T.: Short fatigue crack behaviour under low cycle fatigue regime. Int. J. Fatigue 103 (2017) 207-215

Mazánová V., Heczko M., Kuběna I., Polák J.: Surface Relief Formation in Relation to the Underlying Dislocation Arrangement. Solid State Phenom. 258 (2017) 526-529

Heczko M., Polák J., Kruml T.: Microstructure and dislocation arrangements in Sanicro 25 steel fatigued at ambient and elevated temperatures. Mater. Sci. Eng. A 680 (2017) 168-181

Mazánová V., Polák J., Škorík V., Kruml T.: Multiaxial elastoplastic cyclic loading of austenitic 316L steel. Frattura ed Integrita Strutturale 11 (2017) 162-169



2016

Polák J., Petráš R., Heczko M., Kruml T., Chai G.: Evolution of the cyclic plastic response of Sanicro 25 steel cycled at ambient and elevated temperatures. Int. J. Fatigue 83 (2016) 75-83

Chlupová A., Heczko M., Obrtlík K., Polák J., Roupcová P., Beran P., Kruml T.: Mechanical properties of high niobium TiAl alloys doped with Mo and C. Mater. & Design 99 (2016) 284-292

Polák J., Mazánová V., Kuběna I., Heczko M., Man J.: Surface Relief and Internal Structure in Fatigued Stainless Sanicro 25 Steel. Metall. Mater. Trans. A 47A (2016) 1907-1911

Polák J., Man J.: Experimental evidence and physical models of fatigue crack initiation. Int. J. Fatigue 91 (2016) 294-303

Man J., Kuběna I., Smaga M., Man O., Järvenpää A., Weidner A., Chlup Z., Polák J.: Microstructural changes during deformation of AISI 300 grade austenitic stainless steels: Impact of chemical heterogeneity. Procedia Struct. Integr. 2 (2016) 2299-2306

Polák J., Petráš R., Mazánová V.: Basic Mechanisms Leading to Fatigue Failure of Structural. Trans. Indian Inst. Metals 69 (2016) 289-294

Strunz P., Petrenec M., Polák J., Gasser U., Farkas G.: Formation and dissolution of gama´ precipitates in IN792 superalloy at elevated temperatures. Metals 6 (2016) 1-12

Petráš R., Škorík V., Polák J.: Thermomechanical fatigue and damage mechanisms in Sanicro 25 steel. Mater. Sci. Eng. A 650 (2016) 52-62

Kuběna I., Kruml T., Polák J.: Behaviour of ODS Steels in Cyclic Loading. Trans. Indian Inst. Metals 69 (2016) 309-313

Petráš R., Škorík V., Polák J.: Damage Evolution in Thermomechanical Loading of Stainless Steel. Procedia Struct. Integr. 2 (2016) 3407-3414



2015

Polák J., Petráš R.: Hysteresis loop analysis in cyclically strained materials. Adv. Struct. Mater. 57 (2015) 185-205

Polák J., Man J.: Quantitative model of the surface relief formation in cyclic straining. Acta Phys. Pol. A 128 (2015) 675-680

Polák J., Petráš R., Mazánová V.: Basic mechanisms leading to fatigue failure of structural materials. Trans. Indian Inst. Metals 1 (2015) 1-6

Polák J., Man J.: Initiation of stage I fatigue cracks - experiments and models. Procedia Eng. 101 (2015) 386-394

Guth S., Petráš R., Škorík V., Kruml T., Man J., Lang K., Polák J.: Influence of dwell times on the thermomechanical fatigue behavior of a directionally solidified Ni-base superalloy. Int. J. Fatigue 80 (2015) 426-433

Man J., Valtr M., Petrenec M., Dluhoš J., Kuběna I., Obrtlík K., Polák J.: AFM and SEM-FEG study on fundamental mechanisms leading to fatigue crack initiation. Int. J. Fatigue 76 (2015) 11-18

Polák J., Petrenec M., Chlupová A., Tobiáš J., Petráš R.: Cyclic plastic response of nickel-based superalloy at room and at elevated temperatures. Materials Testing 57 (2015) 119-125

Kuběna I., Polák J., Plocinski T., Hébert C., Škorík V., Kruml T.: Microstructural stability of ODS steels in cyclic loading. Fatigue Fract. Eng. Mater. Struct. 38 (2015) 936-947



2014

Chlupová A., Man J., Kuběna I., Polák J., Karjalainen L.: LCF behaviour of ultrafine grained 301LN stainless steel. Proc. Eng. 74 (2014) 147-150

Polák J., Man J., Kuběna I.: The true shape of persistent slip markings in fatigued metals. Key Eng. Mater. 592-593 (2014) 781-784

Chlupová A., Obrtlík K., Beran P., Heczko M., Polák J., Kruml T.: Monotonic and cyclic properties of TiAl alloys doped with Nb, Mo and C. Procedia Eng. 74 (2014) 405-408

Polák J., Petráš R., Heczko M., Kruml T., Chai G.: Analysis of Cyclic Plastic Response of Heat Resistant Sanicro 25 Steel at Ambient and Elevated Temperatures. Procedia Eng. 74 (2014) 68-73

Polák J., Man J.: Fatigue crack initiation - The role of point defects. Int. J. Fatigue 65 (2014) 18-27

Petrenec M., Polák J., Tobiáš J., Šmíd M., Chlupová A., Petráš R.: Analysis of cyclic plastic response of nickel based IN738LC superalloy. Int. J. Fatigue 65 (2014) 44-50

Polák J., Man J.: Cyclic slip localization and crack initiation in crystalline materials. Adv. Mater. Res. 891-892 (2014) 452-457

Polák J., Man J.: Mechanisms of extrusion and intrusion formation in fatigued crystalline materials. Mater. Sci. Eng. A 596 (2014) 15-24

Man J., Valtr M., Kuběna I., Petrenec M., Obrtlík K., Polák J.: AFM and FIB study of cyclic strain localization and surface relief evolution in fatigued f.c.c. polycrystals. Adv. Mater. Res. 891-892 (2014) 524-529

Polák J., Petráš R., Heczko M., Kuběna I., Kruml T., Chai G.: Low cycle fatigue behavior of Sanicro 25 steel at room and at elevated temperature. Mater. Sci. Eng. A 615 (2014) 175-182

Man J., Weidner A., Klapetek P., Polák J.: Slip activity of persistent slip bands in early stages of fatigue life of austenitic 316L steel. Key Eng. Mater. 592-593 (2014) 785-788

Kuběna I., Polák J., Marmy P., Kruml T.: A comparison of microstructure evolution due to fatigue loading in Eurofer 97 and ODS Eurofer steels. Procedia Eng. 74 (2014) 401-404



2013

Polák J., Kuběna I., Man J.: The shape of early persistent slip markings in fatigued 316L steel. Mater. Sci. Eng. A 564 (2013) 8-12

Polák J., Obrtlík K., Petrenec M., Man J., Kruml T.: Mechanisms of high temperature damage in elastoplastic cyclic loading of nickel superalloys and TiAl intermetallics. Procedia Eng. 55 (2013) 114-122



2012

Polák J., Man J., Petrenec M.: Damage evolution during fatigue in structural materials. Procedia Mater. Sci. 1 (2012) 3-12

Polák J., Man J., Petrenec M., Tobiáš J.: Fatigue behavior of ferritic-pearlitic-bainitic steel in loading with positive mean stress. Int. J. Fatigue 39 (2012) 103-108

Polák J., Petrenec M., Man J., Obrtlík K.: Initiation and short crack growth in austenitic-ferritic duplex steel-effect of positive mean stress. Fatigue Fract. Eng. Mater. Struct. 35 (2012) 257-268

Obrtlík K., Pospíšilová S., Juliš M., Podrábský T., Polák J.: Fatigue behavior of coated and uncoated cast Inconel 713LC at 800 °C. Int. J. Fatigue 41 (2012) 101-106

Man J., Vystavěl T., Weidner A., Kuběna I., Petrenec M., Kruml T., Polák J.: Study of cyclic strain localization and fatigue crack initiation using FIB technique. Int. J. Fatigue 39 (2012) 44-53



2011

Polák J., Petrenec M., Man J.: Cyclic plasticity, cyclic creep and fatigue life of duplex stainless steel in cyclic loading with positive mean stress. Kovové materiály 49 (2011) 347-354

Kruml T., Polák J.: Fatigue cracks in Eurofer 97 steel: Part I. Nucleation and small crack growth kinetics. J. Nucl. Mater. 412 (2011) 2-6

Kruml T., Hutař P., Náhlík L., Seitl S., Polák J.: Fatigue cracks in Eurofer 97 steel: Part II. Comparison of small and long fatigue crack growth. J. Nucl. Mater. 412 (2011) 7-12

Polák J., Petrenec M., Man J., Kruml T.: Cyclic plasticity and cyclic creep in austenitic-ferritic duplex steel. Key Eng. Mater. 465 (2011) 431-434

Obrtlík K., Pospíšilová S., Juliš M., Podrábský T., Polák J.: Effect of Al and Al-Si diffusion coating on the low cycle fatigue behavior of Inconel 713LC. Procedia Eng. 10 (2011) 1360-1365

Polák J., Petrenec M., Kruml T., Chlupová A.: Cyclic plastic response and fatigue life in symmetric and asymmetric cyclic loading. Procedia Eng. 10 (2011) 568-577

Man J., Obrtlík K., Petrenec M., Beran P., Smaga M., Weidner A., Dluhoš J., Kruml T., Biermann H., Eifler D., Polák J.: Stability of austenitic 316L stainless steel against martensite formation during cyclic straining. Procedia Eng. 10 (2011) 1279-1284

Šmíd M., Petrenec M., Polák J., Obrtlík K., Chlupová A.: Analysis of the Effective and Internal Cyclic Stress Components in the Inconel Superalloy Fatigued at Elevated Temperature. Adv. Mater. Res. 278 (2011) 393-398

Weidner A., Glage A., Martin S., Man J., Fuhrmann L., Klemm V., Martin U., Polák J., Rafaja D., Biermann H.: Microstructure of austenitic stainless steels of various phase stabilities after cyclic and tensile deformation. Int. J. Mater. Res. 102 (2011) 1374-1377

Obrtlík K., Pospíšilová S., Juliš M., Podrábský T., Polák J.: Low Cycle Fatigue Behavior of Cast Superalloy Inconel 713LC with Al Coating at 800 C. Key Eng. Mater. 452-453 (2011) 265-268

Kruml T., Kuběna I., Polák J.: Fatigue behaviour and surface relief in ODS steels. Procedia Eng. 10 (2011) 1690-1695

Hutař P., Náhlík L., Ševčík M., Seitl S., Kruml T., Polák J.: Fatigue crack propagation rate in EUROFER 97 estimated using small specimens. Key Eng. Mater. 452-453 (2011) 325-328



2010

Obrtlík K., Juliš M., Man J., Podrábský T., Polák J.: Extrusion and intrusion evolution in cyclically strained cast superalloy Inconel 738LC using confocal laser scanning microscope and AFM. J. Phys.: Conf. Series 240 (2010) 012054

Man J., Weidner A., Kuběna I., Vystavěl T., Skrotzki W., Polák J.: Application of FIB technique to study early fatigue damage in polycrystals. J. Phys.: Conf. Series 240 (2010) 012058

Man J., Valtr M., Weidner A., Petrenec M., Obrtlík K., Polák J.: AFM study of surface relief evolution in 316L steel fatigued at low and high temperatures. Proc. Eng. 2 (2010) 1625-1633



2009

Obrtlík K., Petrenec M., Man J., Polák J., Hrbáček K.: Isothermal fatigue behavior of cast superalloy Inconel 792-5A at 23 and 900 °C. J. Mater. Sci. 44 (2009) 3305-3314

Man J., Obrtlík K., Polák J.: Extrusions and intrusions in fatigued metals. Part 1. State of the art and history. Philos. Mag. 89 (2009) 1295-1336

Man J., Klapetek P., Man O., Weidner A., Obrtlík K., Polák J.: Extrusions and intrusions in fatigued metals. Part 2. AFM and EBSD study of the early growth of extrusions and intrusions in 316L steel fatigued at room temperature. Philos. Mag. 89 (2009) 1337-1372

Polák J., Man J., Vystavěl T., Petrenec M.: The shape of extrusions and intrusions and initiation of stage I fatigue cracks. Mater. Sci. Eng. A 517 (2009) 204-211



2008

Obrtlík K., Chlupová A., Petrenec M., Polák J.: Low cycle fatigue of cast superalloy Inconel 738LC at high temperature. Key Eng. Mater. 385-387 (2008) 581-584

Petrenec M., Obrtlík K., Polák J., Man J.: Dislocation structures in nickel based superalloy Inconel 792-5A fatigued at room temperature and 700 °C. Mater. Sci. Forum 567-568 (2008) 429-432

Polák J., Petrenec M., Man J.: Cyclic stress in 316L austenitic stainless steel at low temperatures. Mater. Sci. Forum 567-568 (2008) 401-404

Weidner A., Man J., Tirschler W., Klapetek P., Blochwitz C., Polák J., Skrotzki W.: Half-cycle slip activity of persistent slip bands at different stages of fatigue life of polycrystalline nickel. Mater. Sci. Eng. A 492 (2008) 118-127



2007

Petrenec M., Obrtlík K., Polák J., Man J.: Effect of temperature on the low cycle fatigue of cast Inconel 792-5A. Key Eng. Mater. 345-346 (2007) 383-386

Polák J., Man J., Vystavěl T., Zouhar L.: Fatigue crack initiation in crystalline materials - experimental evidence and models. Key Eng. Mater. 345-346 (2007) 379-382



2006

Petrenec M., Polák J., Obrtlík K., Man J.: Dislocation structures in cyclically strained X10CrAl24 ferritic steel. Acta Mater. 54 (2006) 3429-3443



2005

Polák J., Petrenec M., Man J.: Dislocation structures and surface relief in fatigued metals. Mater. Sci. Eng. A 400-401 (2005) 405-408

Polák J.: Plastic strain-controlled short crack growth and fatigue life. Int. J. Fatigue 27 (2005) 1192-2001

Polák J.: Cyclic plastic response and fatigue life of duplex and superduplex stainless steel. Kovové materiály 43 (2005) 280-289

Polák J., Zezulka P.: Short crack growth and fatigue life in austenitic-ferritic duplex stainless steel. Fatigue Fract. Eng. Mater. Struct. 28 (2005) 923-935



2004

Man J., Petrenec M., Obrtlík K., Polák J.: AFM and TEM study of cyclic slip localization in fatigued ferritic X10CrAl24 stainless steel. Acta Mater. 52 (2004) 5551-5561



2003

Polák J., Man J., Obrtlík K., Kruml T.: The shape of extrusions and intrusions produced by cyclic straining. Z. Metallkd. 94 (2003) 1327-1330

Man J., Obrtlík K., Polák J.: Study of surface relief evolution in fatigued 316L austenitic stainless steel by AFM. Mater. Sci. Eng. A 351 (2003) 123-132

Polák J., Man J., Obrtlík K.: AFM evidence of surface relief formation and models of fatigue crack nucleation. Int. J. Fatigue 25 (2003) 1027-1036



2002

Man J., Obrtlík K., Blochwitz C., Polák J.: Atomic force microscopy of surface relief in individual grains of fatigued 316L austenitic stainless steel. Acta Mater. 50 (2002) 3767-3780


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