Microstructural approach to fatigue crack processes in polycrystalline bcc materials. Annual technical progress report II. [HSLA steels; Ti-30 Mo]
Objectives are to understand the roles of alloy additions, grain size and yield strength on fatigue threshold and near-threshold growth rates for selected bcc materials. Thus far, a predictive model for burst cleavage in Fe-binary alloys has been derived and verified. A predictive model for cyclic strain hardening exponents of an HSLA steel at low temperatures has been derived and verified. A proposed model for cyclic cleavage crack extension in terms of geometrically necessary dislocations has been partially investigated. Experimentally, grain size and low temperature effects on thresholds and crack growth of HSLA steels and Ti-30 Mo have been nearly completed and similar studies on Fe-binary alloys are in progress. With such input, models are currently being developed for prediction of microstructural effects on threshold and near-threshold crack growth under mixed mode conditions.
- Research Organization:
- Minnesota Univ., Minneapolis (USA). Dept. of Chemical Engineering and Materials Science
- DOE Contract Number:
- AS02-79ER10433
- OSTI ID:
- 6558938
- Report Number(s):
- DOE/ER/10433-2
- Country of Publication:
- United States
- Language:
- English
Similar Records
Microstructural approach to fatigue-crack processes in polycrystalline bcc materials. Annual technical progress report IV. [Ti-30 Mo]
[A microstructural approach to fatigue crack processes in poly crystalline BCC materials]
Related Subjects
360103* -- Metals & Alloys-- Mechanical Properties
ALLOY SYSTEMS
ALLOYS
BCC LATTICES
BINARY ALLOY SYSTEMS
BRITTLE-DUCTILE TRANSITIONS
CRACK PROPAGATION
CRYSTAL DEFECTS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
DISLOCATIONS
FATIGUE
GRAIN SIZE
HARDENING
IRON ALLOYS
IRON BASE ALLOYS
LINE DEFECTS
MECHANICAL PROPERTIES
MICROSTRUCTURE
MOLYBDENUM ALLOYS
RELAXATION
SIZE
STEELS
STRAIN HARDENING
STRAIN RATE
STRESS RELAXATION
TITANIUM ALLOYS
TITANIUM BASE ALLOYS