Some observations on cavitation damage under creep and creep-fatigue loading in Type 304 stainless steel

Technical Report · Sun Jun 01 04:00:00 EDT 1986

OSTI ID:6230520

Majumdar, S; Don, J

Quantitative data are presented on cavitation damage in type 304 stainless steel caused by creep and creep-fatigue loading. Specimens from tests interrupted at various fractions of their nominal life were fractured intergranularly at cryogenic temperature to reveal cavities on grain boundaries. The results show that creep damage in this material is distributed bimodally. It consists of boundaries that are ''cracked,'' i.e., with area fraction of cavities greater than 20%, and boundaries that are ''cavitated,'' i.e., area fraction of cavities less than 10%. Cracked boundaries appear very early in life (10-20%) and constitute that dominant factor of damage by about 50% of life. Although initially the cavity number density increases with time, the cavity diameter at the peak of the distribution remains relatively constant. The distributions of densely cavitated boundaries with respect to their true and apparent angles with the stress direction were measured in a creep specimen. The results indicate that both normal and shear stresses on the boundary may be important in cavitation.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6230520
• Report Number(s): ANL/PPRNT-89-92; ON: DE89008429
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
AUSTENITIC STEELS
CAVITATION
CHROMIUM ALLOYS
CHROMIUM-NICKEL STEELS
COMMINUTION
CORROSION RESISTANT ALLOYS
CRACK PROPAGATION
CREEP
CRYSTAL STRUCTURE
DIFFUSION
FATIGUE
FRACTURING
GRAIN BOUNDARIES
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MECHANICAL PROPERTIES
MICROSTRUCTURE
NICKEL ALLOYS
ORIENTATION
STAINLESS STEEL-304
STAINLESS STEELS
STEEL-CR19NI10
STEELS
STRAIN RATE
TEMPERATURE DEPENDENCE