SYMPOSIA PAPER Published: 01 January 1981
STP33429S

Fractographic Comparison of Plane-Strain Fracture Toughness, Instrumented Precracked Charpy, and Slow-Bend Precracked Charpy Tests on a Quenched and Tempered AISI 4340 Steel

Source

Toughness testing of a quenched and tempered AISI 4340 steel has been carried out by precracked Charpy (instrumented and slow-bend) and fracture toughness test techniques. Results show that the toughness values, as a function of heat treatment, follow similar trends for identical heat-treatment schedules in each type of testing. Fractographic observations also indicate the same fracture initiation mode in all the tests for identical heat treatments, including an intergranular fracture mode associated with the temper embrittlement of the steel in question. It indicates that, in this particular application, mechanical testing variables such as specimen dimensions, crack length, crack length to width ratio, and strain rate have no effect on the fracture initiation process.

Author Information

Datta, KP
University of Kentucky, Lexington, Ky.
Wood, WE
Department of Materials Science, Oregon Graduate Center, Beaverton, Ore.
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Details
Developed by Committee: E08
Pages: 150–165
DOI: 10.1520/STP33429S
ISBN-EB: 978-0-8031-4799-7
ISBN-13: 978-0-8031-0733-5