Toughness of tempered upper and lower bainitic microstructures in a 4150 steel
- Univ. of Tennessee, Knoxville (United States)
The effects of tempering on the Charpy impact toughness and tensile properties of upper and lower bainite in a 4,150 steel have been studied. The results correlate with quantitative measurements taken from both the fracture surfaces and the microstructures of Charpy test specimens. The fracture surfaces from impact specimens having a lower bainitic microstructure were characterized by quasicleavage fracture, whereas those having an upper bainitic microstructure exhibited only cleavage fracture. The quasicleavage facet size and cleavage facet size correlate with bainite packet size and bainite block size. After tempering at high temperatures, the impact toughness is greatly improved for both the upper and lower bainitic microstructures. Changes in toughness correlate with the microstructural change in carbide shape and distribution resulting from the different tempering operations.
- OSTI ID:
- 6491773
- Journal Information:
- Journal of Materials Engineering; (United States), Journal Name: Journal of Materials Engineering; (United States) Vol. 2:2; ISSN JMAEEV; ISSN 0931-7058
- Country of Publication:
- United States
- Language:
- English
Similar Records
Embrittlement of an AISI 8640 lower bainite steel
Microstructural characterization of Charpy-impact-tested nanostructured bainite
Related Subjects
360101* -- Metals & Alloys-- Preparation & Fabrication
360102 -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
BAINITE
CHARPY TEST
CORRELATIONS
CRYSTAL STRUCTURE
DATA
DESTRUCTIVE TESTING
EXPERIMENTAL DATA
FRACTURE PROPERTIES
HEAT TREATMENTS
IMPACT TESTS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
MICROSTRUCTURE
NUMERICAL DATA
STEELS
TEMPERING
TENSILE PROPERTIES
TESTING