Small-specimen fracture-toughness certification techniques for 9 nickel-4 cobalt-0. 20 carbon steel forgings

Technical Report · Tue Apr 01 04:00:00 EST 1980

OSTI ID:5589478

Oakes, Jr, R E

Fracture-toughness certification is often needed for materials which are too thin for valid plane-strain fracture-toughness testing. In this work on 9 nickel-4 cobalt-0.20 carbon steel, the standard Charpy impact test is shown to have limited but - in some applications where only minimum toughness requirements must be met - useful capacity for identifying low-toughness material. Two J-integral test methods (the R-curve and a Single-Specimen technique) are demonstrated capable of fracture-toughness certification of this alloy over a broad toughness range using Charpy-size, precracked, slow-bend specimens. By use of a calibration relationship established in this work between plane-strain fracture toughness and J measured at maximum load, the Single-Specimen technique is simplified for application to production quantity testing.

• Research Organization: Oak Ridge Y-12 Plant, TN (USA)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 5589478
• Report Number(s): Y-2196
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
42 ENGINEERING
420500 -- Engineering-- Materials Testing
ALLOYS
CARBON ADDITIONS
CHARPY TEST
COBALT ALLOYS
DESTRUCTIVE TESTING
FRACTURE PROPERTIES
IMPACT SHOCK
IMPACT TESTS
INSTABILITY
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
NICKEL ALLOYS
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
TEARING INSTABILITY
TESTING