Investigator: prof. Ing. Václav Sklenička, DrSc.
Number of Project: A106/02/0608
Agency: Czech Science Foundation
Duration: 01. 01. 2002 - 31. 12. 2004

The idea of this proposal is to carry out systematic study of microstructure-creep property relationship in selected advanced 9-12%Cr steels. The very recent way to achieve the excellent creep properties of these steels at temperatures higher than 600°C has introduced new alloying concepts. Thus, the Project will be focused on the new generation of the tungsten-containing and the cobalt-containing steels. The main aims of the Project are as follows: (i) Evaluation of the compositional effect of selected elements on high temperature creep strength in advamced 9-12%Cr steels. In particular the role of Co and high levels of W and B will be investigated. (ii) Microstructural investigations of advanced 9-12%Cr steels by analytical microscopic techniques, namely microstructural changes in course of long-term thermal ageing and under creep loading to improve description and understanding of the microstructural evolution and stability of advanced 9-12%Cr steels. (iii) Further development and refinement of physical models for phase equilibrium, reaction kinetics and creep strain accumulation with a view to their ultimate combination.

L. Kloc and V. Sklenička:
Confirmation of low stress creep regime in 9% chromium steel by stress change creep experiments
Mater. Sci. Eng. A 387-389 (2004) 633-638

V. Sklenička, K.Kuchařová, M. Svoboda, L. Kloc, J. Buršík, A. Kroupa:
Long-term creep behavior of 9–12%Cr power plant steels
Materials Characterization 51, (2003), p. 35-48

V. Sklenička, K. Kuchařová, J. Kudrman, M. Svoboda, L. Kloc:
Microstructure stability and creep behaviour of advanced high chromium ferritic steels
Kovové Mater., 43, No. 1, (2005), p. 20-33

L. Kloc, V. Sklenička:
Mater. Sci. Eng. A, 387-389, (2004), p. 633-638

Václav Sklenička, Květa Kuchařová, Milan Svoboda and Ivan Saxl
Effect of Intermittent Heating on Creep Behaviour
of Advanced 9-12%Cr Power Plant Steels
Materials Science Forum Vols. 561-565 (2007) pp. 81-84