Institute of Physics of Materials AS CR, v. v. i. > Projects > Improvement of Properties and Complex Characterization of New Generation Fe-Al-O Based Oxide Precipitation Hardened Steels

Improvement of Properties and Complex Characterization of New Generation Fe-Al-O Based Oxide Precipitation Hardened Steels

InvestigatorRNDr. Jiří Svoboda, CSc., DSc.
Number of Project17-01641S
AgencyGrantová agentura České republiky
Duration2017-01-01 - 2019-12-30

Anotace
The applicants have developed new low-cost Fe-Al-O based Oxide Precipitation Hardened (OPH) ferritic steels, with excellent high temperature oxidation resistance and microstructure stability. The steel can be prepared in two steps: 1. mechanical alloying of Fe and Al powders in controlled O2 atmosphere, during which oxygen is trapped at multiple defects in the matrix and 2. hot consolidation by rolling, during which fine Al oxides precipitate from the supersaturated recrystallized matrix Fully dense fine-grained (100-200nm) steel with homogeneous dispersion of 2-5 vol.% of Al oxides (10-20nm) is hard and brittle, however, its hot forming is easy. During annealing above 1000°C abnormal grain growth leads to 50-100 mym grains by keeping the size of oxides unchanged and the steel gets softer and ductile. The new OPH steel exhibits very promising mechanical properties between room temperature and 1100°C. Several grades of the OPH steel will be prepared and complexly characterized from the point of mechanical properties, microstructure long-term stability and ability of hot forming. The project aims are improvement of OPH steels by varying milling and rolling conditions and oxygen content followed by evaluation. Complex characterization of improved grades with various oxygen content covering fracture, creep, fatigue and hot formability properties, microstructure stability and oxidation resistance.


2020

Svoboda J., Kunčická L., Luptáková N., Weiser A., Dymáček P.: Fundamental Improvement of Creep Resistance of New-Generation Nano-Oxide Strengthened Alloys via Hot Rotary Swaging Consolidation. Materials 13 (2020) 5217

Stratil L., Horník V., Dymáček P., Roupcová P., Svoboda J.: The Influence of Aluminum Content on Oxidation Resistance of New-Generation ODS Alloy at 1200°C. Metals 10 (2020) 1478

Chlupová A., Šulák I., Svoboda J.: High Temperature Cyclic Plastic Response of New-Generation ODS Alloy. Metals 10 (2020) 804

Khalaj O., Saebnoori E., Jirková H., Chocholaty O., Kučerová L., Hajšman J., Svoboda J.: The Effect of Heat Treatment on the Tribological Properties and Room Temperature Corrosion Behavior of Fe-Cr-Al-Based OPH Alloy. Materials 13 (2020) 5465

Scheiber D., Jechtl T., Svoboda J., Fischer F., Romaner L.: On solute depletion zones along grain boundaries during segregation. Acta Mater. 182 (2020) 100-107

Khalaj O., Saebnoori E., Jirková H., Chocholaty O., Svoboda J.: High Temperature and Corrosion Properties of A Newly Developed Fe-Al-O Based OPH Alloy. Metals 10 (2020) 167

Svoboda J., Shan Y., Zickler G., Kozeschnik E., Fischer F.: Local approach for coarsening of precipitates. Scr. Mater. 178 (2020) 232-235

Svoboda J., Horník V., Riedel H.: Modelling of Processing Steps of New Generation ODS Alloys. Metall. Mater. Trans. A 51 (2020) 5296-5305

Svoboda J., Luptáková N., Jarý M., Dymáček P.: Influence of Hot Consolidation Conditions and Cr-Alloying on Microstructure and Creep in New-Generation ODS Alloy at 1100 °C. Materials 13 (2020) 5070



2019

Dymáček P., Svoboda J., Jirková H., Stratil L., Horník V.: Microstructure evolution and creep strength of new-generation oxide dispersion strengthened alloys with high volume fraction of nano-oxides. Procedia Struct. Integr. 17 (2019) 427-433

Dymáček P., Bártková D., Horník V., Stratil L., Mašek B., Svoboda J.: New Generation of ODS Alloys. Key Eng. Mater. 810 (2019) 113-118

Svoboda J., Ecker W., Razumovskiy V., Zickler G., Fischer F.: Kinetics of interaction of impurity interstitials with dislocations revisited. Prog. Mater. Sci. 101 (2019) 172-206

Svoboda J., Shan Y., Kozeschnik E., Fischer F.: Influence of misfit stress relaxation by power-law creep and plasticity on kinetics of coarsening of precipitates. Scr. Mater. 168 (2019) 81 -85

Hackl K., Khan A., Fischer F., Svoboda J.: Influence of bulk energy and triple junction mobility on interface kinetics - A tool for interpretation of experiments. Acta Mater. 174 (2019) 310-318



2018

Svoboda J., Zickler G., Fischer F.: An innovative concept for interstitial diffusion in stressed crystals. Int. J. Solids Struct. 134 (2018) 173-180

Fischer F., Zickler G., Svoboda J.: Elastic stress-strain analysis of an infinite cylindrical inclusion with eigenstrain. Arch. Appl. Mech. 88 (2018) 453-460

Fischer F., Zickler G., Svoboda J.: Stress-strain analysis of the antiplane shear problem for an infinite cylindrical inclusion with eigenstrain an addendum to Arch. Appl. Mech. 2018. Arch. Appl. Mech. 88 (2018) 1209-1211

Khalaj O., Jirková H., Mašek B., Hassasroudsari P., Studecký T., Svoboda J.: Using thermomechanical treatments to improve the grain growth of new-generation ODS alloys. Mater. Technol. 52 (2018) 475-482

Svoboda J., Horník V., Stratil L., Hadraba H., Mašek B., Khalaj O., Jirková H.: Microstructure Evolution in ODS Alloys with a High-Volume Fraction of Nano Oxides. Metals 8 (2018) 1079

Scheiber D., Romaner L., Fischer F., Svoboda J.: Kinetics of grain boundary segregation in multicomponent systems - The example of a Mo-C-B-O system. Scr. Mater. 150 (2018) 110-114

Svoboda J., Fischer F.: Anisotropy of interstitial diffusion in bcc-crystals due to stress-induced unequal occupancies of different types of sites. Int. J. Solids Struct. 152-153 (2018) 66-70

Svoboda J., Fischer F.: Influence of accounting for translationa lmotion of grains on grain growth kinetics and size distribution. Scr. Mater. 146 (2018) 255-259