Creep fracture in austenitic stainless steels containing antimony or titanium

Conference · Sun Jan 01 04:00:00 EST 1984

OSTI ID:5064366

Schneibel, J H; White, C L; Petersen, G F; Padgett, R A

The effect of antimony or titanium additions on the creep fracture, and in particular the cavitation behavior, of an austenitic stainless steel has been investigated. An addition of 1 wt % Sb results in a pronounced increase of the number density of intergranular creep cavities and a strong reduction in the creep ductility, as compared to an undoped reference heat. If 0.2 wt % Ti is added instead, the density of creep cavities decreases significantly, and creep fracture occurs in a ductile manner with high elongations to fracture. The cavity growth rates in the undoped, as well as in the antimony-doped, material are found to be compatible with a diffusional growth mechanism. Titanium additions are expected to slow down cavity growth rates, owing to a lowering of the grain boundary diffusivity, and to dynamic recrystallization. They are also likely to retard cavity nucleation. The ductility improvement by titanium is associated with a decrease in sulfur and an increase in phosphorus levels at internal cavity surfaces, as compared to the undoped base material. 23 references, 9 figures, 2 tables.

• OSTI ID: 5064366
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
ADDITIVES
ALLOYS
ANTIMONY
CHROMIUM ALLOYS
CORROSION RESISTANT ALLOYS
CREEP
CRYSTAL STRUCTURE
ELEMENTS
FRACTURE PROPERTIES
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
METALS
MICROSTRUCTURE
STAINLESS STEELS
STEELS
TITANIUM
TRANSITION ELEMENTS