Influence of inclusion spacing and void growth on the toughness of ultra high strength steels

Conference · · TMS (The Metallurgical Society) Paper Selection; (USA)

OSTI ID:5368010

Garrison, Jr, W M ^[1]

---

1. Sandia National Laboratories, Livermore, CA (USA)

The Rice and Johnson model for ductile fracture predicts that, for a fixed inclusion volume fraction and constant yield strength, the fracture toughness will be proportional to the square root of the inclusion spacing X{sub O}. However, there are mechanisms which might result in the linking of voids and their joining to the crack tip before they attain the size permitted by the Rice and Johnson model. As a result, the fracture toughness should be dependent on both X{sub O} and the extent of void growth. McMeeking's calculations of void growth based on the Rice and Tracey model suggest that the K{sub Ic} of ultra high strength steels will scale as X{sub O} {sigma}{sub y}(R{sub V}/R{sub I}){sup {1/2}} where {sigma}y is the yield strength and (R{sub V}/R{sub I}) is the void radius divided by inclusion radius. This proposed scaling is consistent with the behavior exhibited by a series of ultra high strength steels.

• OSTI ID: 5368010
• Report Number(s): CONF-840909--
• Conference Information: Journal Name: TMS (The Metallurgical Society) Paper Selection; (USA) Journal Volume: 56
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
CORRELATIONS
CRACKS
CRYSTAL STRUCTURE
DUCTILITY
FAILURES
FRACTURE PROPERTIES
FRACTURES
INCLUSIONS
IRON ALLOYS
IRON BASE ALLOYS
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
MICROSTRUCTURE
SPACE DEPENDENCE
STEELS
TENSILE PROPERTIES
VOIDS
YIELD STRENGTH