Intergranular fracture in 4340-type steels: effects of impurities and hydrogen. Final report, 8 December 1975--7 December 1976
Technical Report
·
OSTI ID:6825720
A study has been made of the conditions which lead to intergranular brittle fracture in 4340-type steels at an ultrahigh yield strength level (200 ksi, 1380 MPa) in both an ambient environment and gaseous hydrogen. By means of Charpy impact tests on commercial and high-purity steels, and by Auger electron spectroscopy of fracture surfaces, it is shown that one-step temper embrittlement (OSTE or '500 F embrittlement'), and low-K intergranular cracking in gaseous hydrogen are the result of segregation of P to prior austenite grain boundaries. Segregation of N also contributes to OSTE. Most, if not all, segregation apparently occurs during austenitization, rather than during tempering. These observations are discussed in terms of our understanding of the mechanisms of OSTE and hydrogen-assisted cracking.
- Research Organization:
- Pennsylvania Univ., Philadelphia (USA). Dept. of Metallurgy and Material Science
- OSTI ID:
- 6825720
- Report Number(s):
- AD-A-054603
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
AUGER ELECTRON SPECTROSCOPY
CARBON STEELS
CHROMIUM ALLOYS
CRYOGENIC FLUIDS
CRYSTAL STRUCTURE
ELECTRON SPECTROSCOPY
ELEMENTS
EMBRITTLEMENT
FAILURES
FLUIDS
FRACTURES
GRAIN BOUNDARIES
HYDROGEN
IMPURITIES
IRON ALLOYS
IRON BASE ALLOYS
METALLURGICAL EFFECTS
METALS
MICROSTRUCTURE
MOLYBDENUM
NICKEL ALLOYS
NONMETALS
REFRACTORY METALS
SPECTROSCOPY
STEELS
TRANSITION ELEMENTS
VERY HIGH PRESSURE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
AUGER ELECTRON SPECTROSCOPY
CARBON STEELS
CHROMIUM ALLOYS
CRYOGENIC FLUIDS
CRYSTAL STRUCTURE
ELECTRON SPECTROSCOPY
ELEMENTS
EMBRITTLEMENT
FAILURES
FLUIDS
FRACTURES
GRAIN BOUNDARIES
HYDROGEN
IMPURITIES
IRON ALLOYS
IRON BASE ALLOYS
METALLURGICAL EFFECTS
METALS
MICROSTRUCTURE
MOLYBDENUM
NICKEL ALLOYS
NONMETALS
REFRACTORY METALS
SPECTROSCOPY
STEELS
TRANSITION ELEMENTS
VERY HIGH PRESSURE