Influence of nonmetallic inclusions on the character of fracture of 20GFL steel

Journal Article · Sat Mar 01 04:00:00 EST 1986 · Met. Sci. Heat Treat. Met. (Engl. Transl.); (United States)

OSTI ID:5474637

Aksel'rod, A E; Knyazeva, V R; Sarrak, V I; Zhitova, L P

The authors investigate the influence of the quantity and morphology of nonmetallic inclusions on the characteristics of fracture resistance and determination of the internal interfaces on which fracture of cast steels occurs. The sharpangled nonmetallic inclusions in the unmodified 20GFL steel used weaken the primary austenitic grain boundaries and are centers of the crack origin. Globularization and refinement of the nonmetallic inclusions, a decrease in the quantity of them, and the increase in the dispersion of the dendritic structure in the steel deoxidized with calcium silicide or melted with the use of prereduced pellets cause an increase in the strength of the primary austenitic grain boundaries. Crack origin is difficult at such boundaries, and as the result the impact strength of 20GFL steel increases.

• Research Organization: Ural Sci-Res. Institute For Ferrous Metallurgy
• OSTI ID: 5474637
• Journal Information: Met. Sci. Heat Treat. Met. (Engl. Transl.); (United States), Journal Name: Met. Sci. Heat Treat. Met. (Engl. Transl.); (United States) Vol. 27:9; ISSN MHTRA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
AUSTENITIC STEELS
CALCIUM COMPOUNDS
CALCIUM SILICIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CRACK PROPAGATION
CRYSTAL STRUCTURE
FRACTURE PROPERTIES
GRAIN BOUNDARIES
IMPACT STRENGTH
INCLUSIONS
IRON ALLOYS
IRON BASE ALLOYS
MANGANESE ALLOYS
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
METALLURGICAL EFFECTS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
REDUCTION
SILICIDES
SILICON COMPOUNDS
STEELS
SULFIDES
SULFUR COMPOUNDS
TESTING
VANADIUM ADDITIONS
VANADIUM ALLOYS