Institute of Physics of Materials AS CR, v. v. i. > Projects > Influence of microstructure on creep mechanisms in advanced heat resistant steels

Influence of microstructure on creep mechanisms in advanced heat resistant steels

InvestigatorIng. Petr Král, Ph.D.
Number of Project19-18725S
AgencyGrantová agentura České republiky
Duration2019-01-01 - 2021-12-31

Anotace
Heat resistant steels are significant structural material for high temperature components of steam power plants. The largest changes in their creep behaviour occur after long-term service. However, current projects (project duration 3 years) do not allow detailed study of creep mechanisms that occur at 10 000-100 000 h., such as diffusion creep. Recently, it has been found that such creep mechanisms can be investigated in materials after the application of severe plastic deformation. The application of severe plastic deformation leads to the formation of structures with different grain size, dislocation density and frequency of low-angle boundaries which allows to study the various mechanisms from dislocation creep to diffusion creep. The motivation of present project is the experimental study of creep mechanisms and microstructural changes which can influence long-term creep properties of advanced heat resistance steels. Experimental creep results will be compared with creep models.


2020

Sklenička V., Král P., Dvořák J., Takizawa Y., Masuda T., Horita Z., Kuchařová K., Kvapilová M., Svobodová M.: Effects of Grain Refinement and Predeformation Impact by Severe Plastic Deformation on Creep in P92 Martensitic Steel. Adv. Eng. Mater. 22 (2020) 1900448

Král P., Dvořák J., Sklenička V., Horita Z., Takizawa Y., Tang Y., Kvapilová M., Svobodová M.: Effect of ultrafine-grained microstructure on creep behaviour in 304L austenitic steel. Mater. Sci. Eng. A 785 (2020) 139383

Král P., Dvořák J., Blum W., Sklenička V., Horita Z., Takizawa Y., Tang Y., Kunčická L., Kocich R., Kvapilová M., Svobodová M.: The Effect of Predeformation on Creep Strength of 9% Cr Steel. Materials 13 (2020) 5330