Publication detail

Microstructure and impact properties of ferritic ODS ODM401 (14%Cr-ODS of MA957 type)

HADRABA, H. KAZIMIERZAK, B.STRATIL, L. DLOUHÝ, I.

Czech title

Mikrostruktura a nárazové vlasnosti feritické ODS ODM401 (14%CR ODS typu MA957)

English title

Microstructure and impact properties of ferritic ODS ODM401 (14%Cr-ODS of MA957 type)

Type

journal article - other

Language

en

Original abstract

The oxide dispersion strengthened (ODS) steel ODM401 is one of the ODS steels developed during the 1960–1970s as a structural tubing material for fast breeder reactors, mainly because of their hightemperature strength and swelling resistance under irradiation. Nowadays, these steels are taken under consideration as a structural material for blanket and heat exchanger components in fusion reactors. The aim of the work was to describe fracture behaviour of ODM401 steel in connection to the microstructure. The microstructure of as-extruded ODM401 steel has fine grains elongated in the extrusion direction. The two population of Y–Ti–O particles sizes were found in the microstructure of size about 10–20 nm and 2– 3 nm. Temperature dependence of KLST impact energy was measured and transition temperature tDBTT evaluated about -110 degree C. The fracture surface was formed by alternated cleavage areas connected by inclined areas fractured by dimple micro mechanism proportional to the impact energy.

Czech abstract

Oxidačně disperzně zpevněná (ODS) ocel ODM401 je jednou z ODS ocelí vyvinutou v šedesátých až sedmdesátých letech dvacátého století jako konstrukční materiál pro výrobu trubek pro rychlé množivé rekatory hlavně kvůli jejich vysokoteplotní pevnosti a odolnosti proti tečení v prostředí radiace. V současnosti jsou tyto oceli uvažovány jako konstrukční materiály pro obálky a tepelné výměníky ve fúzních rekatorech. Cílem této práce bylo popsat lomové chování oceli ODM401 v souvislosti s mikrostrukturou. Mikrostruktura extrudované oceli je tvořena jemnými zrny protáhlými ve směru extruze. V mikrostruktuře oceli byla zjištena bi-modální velikostní distribuce částic Y-Ti-O velikosti přibližně 10-20 nm a 2-3 nm. Z teplotní závislosti nárazové práce zjištěné na tělesech typu KLST byla získána tDBTT -110 stupňů C. Lomové plochy byly tvořeny střídajícími se štěpnými plochami a plochami porušenými mechanismem mikrodutin proporcionálně k měřené hodnotě nárazové práce.

English abstract

The oxide dispersion strengthened (ODS) steel ODM401 is one of the ODS steels developed during the 1960–1970s as a structural tubing material for fast breeder reactors, mainly because of their hightemperature strength and swelling resistance under irradiation. Nowadays, these steels are taken under consideration as a structural material for blanket and heat exchanger components in fusion reactors. The aim of the work was to describe fracture behaviour of ODM401 steel in connection to the microstructure. The microstructure of as-extruded ODM401 steel has fine grains elongated in the extrusion direction. The two population of Y–Ti–O particles sizes were found in the microstructure of size about 10–20 nm and 2– 3 nm. Temperature dependence of KLST impact energy was measured and transition temperature tDBTT evaluated about -110 degree C. The fracture surface was formed by alternated cleavage areas connected by inclined areas fractured by dimple micro mechanism proportional to the impact energy.

Keywords in Czech

KLST, ODS oceli, ODM401, nárazové chování

Keywords in English

KLST, ODS steels, ODM401, impact behaviour

RIV year

2011

Released

03.10.2011

ISSN

0022-3115

Volume

417

Number

1-3

Pages from–to

241–244

Pages count

4

BIBTEX


@article{BUT76002,
  author="Hynek {Hadraba} and Luděk {Stratil} and Ivo {Dlouhý},
  title="Microstructure and impact properties of ferritic ODS ODM401 (14%Cr-ODS of MA957 type)",
  year="2011",
  volume="417",
  number="1-3",
  month="October",
  pages="241--244",
  issn="0022-3115"
}