Influence of titanium and nitrogen on the fracture properties of weld metals

Book · Sat Dec 31 04:00:00 EST 1994

OSTI ID:27944

Kocak, M; Petrovski, B I; Richter, E ^[1]; Evans, G M ^[2]

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1. GKSS Research Center, Geesthacht (Germany). Inst. of Materials Research
2. Oerlikon Welding Ltd., Zuerich (Switzerland)

A The effects of titanium and nitrogen contents on the C-Mn shielded metal arc weld (SMAW) metal properties have been studied. There are still uncertainties concerning the exact role of each element and interactions between these elements with respect to the weld metal microstructure and fracture toughness properties. Therefore, systematic additions of titanium (in the range of 5 to 450 ppm) and nitrogen (80, 160 and 240 ppm) were made to obtain various amounts of acicular ferrite and different microstructures which lead to varying fracture behaviors. The research program covers the determination of tensile properties, Charpy-V notch transition curves and crack tip opening displacement (CTOD) fracture toughness values of different weld deposits containing three different nitrogen contents. The results show that an optimum level of titanium (30 ppm) addition enhanced the formation of acicular ferrite and hence improved the Charpy-V impact and CTOD toughness values. An increase of nitrogen increased the strength but caused a drastic deterioration of both Charpy-V impact and CTOD toughness values at the upper shelf and transition regime.

• OSTI ID: 27944
• Report Number(s): CONF-940230--; ISBN 0-7918-1266-9
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHARPY TEST
CHEMICAL COMPOSITION
EXPERIMENTAL DATA
FRACTURE MECHANICS
FRACTURE PROPERTIES
GRAIN BOUNDARIES
HARDNESS
MANGANESE STEELS
METALLURGICAL EFFECTS
MICROSTRUCTURE
NITROGEN
SAMPLE PREPARATION
TENSILE PROPERTIES
TITANIUM
WELDED JOINTS