Influence of the microstructure on the fracture toughness and fracture mechanisms of forging steels microalloyed with titanium with ferrite-perlite structures

Journal Article · Sun Aug 15 04:00:00 EDT 1993 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(93)90146-J· OSTI ID:6208508

Linaza, M A; Romero, J L; Rodriguez-Ibabe, J M; Urcola, J J ^[1]

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1. ESII de San Sebastian and CEIT, Basque Country (Spain)

Titanium addition to vanadium microalloyed forging steels is one of the ways proposed to improve fracture toughness. Fine TiN particles inhibit austenite grain growth after recrystallization at the high temperatures used to forge these steels. TiN particles, however, can be formed in the liquid, and as their sizes exceed one micron, they could act as cleavage nucleation sites, impairing the fracture toughness. The present work reports fracture toughness results obtained in Ti treated microalloyed forging steels, showing that in coarse microstructures cleavage is nucleated in coarse TiN particles, but that after refining the microstructure, voids originate at the same particles, resulting in ductile rupture.

• OSTI ID: 6208508
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 29:4; ISSN SCRMEX; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CARBON ADDITIONS
DATA
EXPERIMENTAL DATA
FABRICATION
FERRITE
FORGING
FRACTURE PROPERTIES
GRAIN GROWTH
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS WORKING
MECHANICAL PROPERTIES
MICROSTRUCTURE
NITRIDES
NITROGEN COMPOUNDS
NUCLEATION
NUMERICAL DATA
PEARLITE
PNICTIDES
RECRYSTALLIZATION
STEELS
TITANIUM ADDITIONS
TITANIUM ALLOYS
TITANIUM COMPOUNDS
TITANIUM NITRIDES
TRANSITION ELEMENT COMPOUNDS
VOIDS