Publication detail

Fracture Resistance of 14Cr ODS Steel Exposed to a High Temperature Gas

HOJNÁ, A. MICHALIČKA, J. HADRABA, H. DI GABRIELE, F. DUCHOŇ, J. ROZUMOVÁ, L. HUSÁK, R.

Original Title

Fracture Resistance of 14Cr ODS Steel Exposed to a High Temperature Gas

Type

journal article in Web of Science

Language

English

Original Abstract

This paper studies the impact fracture behavior of the 14%Cr Oxide Dispersion Strengthened (ODS) steel (ODM401) after high temperature exposures in helium and air in comparison to the as-received state. A steel bar was produced by mechanical alloying and hot-extrusion at 1150 °C. Further, it was cut into small specimens, which were consequently exposed to air or 99.9% helium in a furnace at 720 °C for 500 h. Impact energy transition curves are shifted towards higher temperatures after the gas exposures. The transition temperatures of the exposed states significantly increase in comparison to the as-received steel by about 40 °C in He and 60 °C in the air. Differences are discussed in terms of microstructure, surface and subsurface Scanning Electron Microscope (SEM) and Transmission Electron Microscope (TEM) observations. The embrittlement was explained as temperature and environmental effects resulting in a decrease of dislocation level, slight change of the particle composition and interface/grain boundary segregations, which consequently affected the nucleation of voids leading to the ductile fracture.

Keywords

nanostructured steel; thermal aging; impact fracture; microanalysis; oxidation

Authors

HOJNÁ, A.; MICHALIČKA, J.; HADRABA, H.; DI GABRIELE, F.; DUCHOŇ, J.; ROZUMOVÁ, L.; HUSÁK, R.

Released

1. 12. 2017

Publisher

MDPI

ISBN

2075-4701

Periodical

Metals

Year of study

7

Number

12

State

Swiss Confederation

Pages from

560-1

Pages to

560-17

Pages count

17

URL

Full text in the Digital Library