The in-situ observations of microcrack nucleation and bluntness in ductile fracture
- Univ. of Science and Technology, Beijing (China). Dept. of Materials Physics
The in-situ tensile test in a transmission electron microscope (TEM) is a powerful method for studying the mechanism of the initiation and propagation of microcracking and voiding in ductile fracture. For f.c.c materials, it is generally recognized that voids or microcracks with a length of a micrometer initiate and grow through the thinning of a thin zone resulting from multiple slip and link with the main crack resulting in a zig-zag crack propagation. The microcracks reported here, however, were in fact voids with sizes from hundreds of nanometers to several micrometers. Until now, there are no reports about the initiation of a microcrack with nanometer sizes, and blunting into a void with micrometer sizes. Neither is it clear where and how a microcrack nucleates and changes into a void. It has been generally accepted and there is a dislocation free zone (DFS) ahead of a crack tip, though the argument about it still persists. The principle topics of this paper are to study the possibility of initiating a microcrack with nanometer size in the DFZ of the ductile materials and to clarify how a microcrack transforms into a void through an in-situ tensile test. The ductile material used for this investigation was a stable austenitic stainless steel of type 310.
- OSTI ID:
- 7236567
- Journal Information:
- Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 30:10; ISSN 0956-716X; ISSN SCRMEX
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
AUSTENITIC STEELS
CHROMIUM ALLOYS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
CRACK PROPAGATION
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DATA
DISLOCATIONS
DUCTILITY
EXPERIMENTAL DATA
FRACTURE PROPERTIES
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HIGH ALLOY STEELS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
LINE DEFECTS
MATERIALS
MECHANICAL PROPERTIES
NICKEL ALLOYS
NUMERICAL DATA
STAINLESS STEEL-310
STAINLESS STEELS
STEEL-CR25NI20
STEELS
TENSILE PROPERTIES