Prediction of toughness behavior using precracked Charpy specimens. Paper 75-Pet-25

Conference · Wed Jan 01 04:00:00 EST 1975

OSTI ID:7273952

Diesburg, D E

Various toughness tests were performed on controlled-rolled Mn-Mo-Nb steel to evaluate the effect of specimen size on fracture properties. The Charpy V-notch impact energy curves were compared with the ductile-to-brittle transition temperature behavior determined using full-thickness tests. It was found that the Charpy V-notch specimen is limited in its ability to predict the ductile-to-brittle transition temperature behavior of thick plate. However, fatigue-precracked Charpy impact specimens did give a transition behavior corresponding to that of /sup 5///sub 8/-in. thick machine-notched dynamic tear specimens. In the ductile regime, Charpy V-notched specimens absorbed less energy per area than the full-thickness specimens. Instrumenting the Charpy test provided a means whereby the beginning of the ductile-to-brittle transition region could be quantitatively defined more precisely than by means of a visual evaluation of the fracture appearance. Using precracked specimens in the instrumented Charpy test provided a nil-ductility transition temperature (NDTT) value that agreed with the results obtained using the full-thickness Robertson test.

• Research Organization: Climax Molybdenum Co. of Michigan, Ann Arbor (USA)
• OSTI ID: 7273952
• Report Number(s): CONF-750918-2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CHARPY TEST
CRACKS
DUCTILITY
FABRICATION
FRACTURE PROPERTIES
IRON ALLOYS
IRON BASE ALLOYS
MANGANESE ALLOYS
MATERIALS WORKING
MECHANICAL PROPERTIES
MOLYBDENUM ADDITIONS
MOLYBDENUM ALLOYS
NIOBIUM ADDITIONS
NIOBIUM ALLOYS
PHYSICAL PROPERTIES
ROLLING
STEELS
TENSILE PROPERTIES
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE