Deformation of metastable austenitic steels at low temperatures
The stress-strain characteristics at low temperatures of commercial grades of polycrystalline austenitic stainless steels containing about 18 wt.% Cr and 8 wt.% Ni are not conventional. The anomalous behavior results, it is thought, from the martenstic transformation of face-centered cubic austenite to body-centered cubic (alpha') and hexagonal close-packed phases. It is suggested that the plastic deformation of metastable austenites goes through three stages. A series of Fe-18Cr-8Ni-1-6Mn, 0.1-0.2N allloys, tested at 4 K, is used to demonstrate the usefulness of this characterization. The experimental procedures and parameters are given. Stress-strain curves are used to identify the stages. State I begins at the elastic limit and ends at the onset of easy glide. The yield strength is included in this stage. Stage II is the easy glide region; stage III is the region of high work hardening. It is concluded that the parameters of stress and strain associated with the onset of the three stages correlates very well with alloy content.
- Research Organization:
- National Bureau of standards, Boulder, CO
- OSTI ID:
- 6018534
- Journal Information:
- Adv. Cryog. Eng.; (United States), Journal Name: Adv. Cryog. Eng.; (United States) Vol. 28; ISSN ACYEA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Tensile properties and deformation-induced transformations in metastable austenitic single crystals
INVESTIGATIONS ON THE PLASTICITY OF SINGLE CRYSTALS OF NICKEL-COBALT ALLOYS
Related Subjects
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CHROMIUM ALLOYS
CORROSION RESISTANT ALLOYS
CRYOGENICS
DEFORMATION
ENERGY LEVELS
EXCITED STATES
HARDENING
IRON ALLOYS
IRON BASE ALLOYS
LOW TEMPERATURE
MATERIALS TESTING
MECHANICAL PROPERTIES
METASTABLE STATES
PLASTICITY
STAINLESS STEELS
STEELS
STRAIN HARDENING
STRAINS
STRESSES
TENSILE PROPERTIES
TESTING
ULTRALOW TEMPERATURE