Fracture resistance in carburizing steels. Part I: fracture toughness

Journal Article · Tue May 01 04:00:00 EDT 1979 · Met. Prog.; (United States)

OSTI ID:5687161

Smith, Y E; Diesburg, D E

Fracture toughness evaluations were made in carburized steels from near the surface of the case to depths approaching the core. The most noteworthy observations associated with these data are listed below: (1) In general, the fracture toughness is lowest near the case surface and increases as the core is approached. This relationship is primarily controlled by carbon content. (2) In EX32 and SAE 4820 steels, which differ in retained austenite content, fracture toughness versus carbon content gradients are identical indicating no influence of retained austenite. (3) In an EX55 base steel with high (0.6 to 1.0%) carbon content, there was no influence of retained austenite on fracture toughness. (4) In the carburized cases of a series of steels produced by modifying an SAE 8822 base composition, where the individual alloying effects of manganese, chromium, nickel and molybdenum were evaluated, molybdenum was the only element that could be increased to a relatively high level (0.9%) without significantly reducing fracture toughness.

• Research Organization: Climax Molybdenum Co. of Michigan, Ann Arbor
• OSTI ID: 5687161
• Journal Information: Met. Prog.; (United States), Journal Name: Met. Prog.; (United States); ISSN MEPOA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CARBURIZATION
CRACK PROPAGATION
FRACTURE MECHANICS
FRACTURE PROPERTIES
HARDENING
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
MECHANICS
STEELS
SURFACE HARDENING
SURFACE TREATMENTS