Fracture resistance of various carburized steels

Autor:	D. E. Diesburg, G. T. Eldis
Rok vydání:	1978
Předmět:	Austenite Structural material Materials science Impact fracture Metallurgy Metals and Alloys chemistry.chemical_element Condensed Matter Physics Fatigue limit Stress (mechanics) Fracture toughness chemistry Mechanics of Materials Fracture (geology) Carbon
Zdroj:	Metallurgical Transactions A. 9:1561-1570
ISSN:	2379-0180 0360-2133
DOI:	10.1007/bf02661938
Popis:	Fracture toughness and fatigue studies were conducted on various grades of car-burizing steels. The results indicate that similar or superior mechanical performance can be achieved using the alternate EX grades (EX24, EX29, and EX55) compared to the more commonly used grades (SAE 8620, SAE 4320, and SAE 4817). During the study of fatigue properties, various trends on the influence of surface carbon (re-tained austenite) and carbon gradient (hardness profile and case depth) were observed: 1) increasing the surface carbon to the extent that the hardness profile indicated a max-imum at 0.02 in. (0.5 mm) below the surface severely reduced the endurance limit, 2) changing the hardness profile such that the maximum hardness occurred within 0.010 in. (0.25 mm) of the surface improved the endurance limit, but lowered the impact fracture stress, and 3) increasing the case depth improved the endurance limit.
Databáze:	OpenAIRE
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