Quantitative analysis of fracture modes in cryogenic /sup 6/Ni steel by stereo SEM technique
- Resource Type
- Technical Report
- Authors
- Source
- Other Information: Thesis
- Subject
- 36 MATERIALS SCIENCE NICKEL STEELS
FRACTURE PROPERTIES
TEMPERATURE DEPENDENCE
ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
NICKEL ALLOYS
STEELS 360103* -- Metals & Alloys-- Mechanical Properties
- Language
- English
Systematic three dimensional (3D) quantitative analyses of fracture surface on /sup 6/Ni cryogenic steel are used to study the effect of temperature variations on the geometrical factors that describe the shape of ductile dimples (DD) and quasicleavage (QC) facets. Stereo SEM techniques combined with stereo photogrametry provide the tools to perform such analysis on standard Charpy specimens tested with appropriate instrumentation over a 300 degrees temperature range. Mechanical properties and tridimensional geometrical factors are found to be intimately related. The influence of temperature on DD and QC is considerably different, showing that quasicleavage is a transitional fracture mechanism that serves as a link between ductile and cleavage fracture.