Toughness in HSLA steel weldments

Journal Article · Sun Oct 01 00:00:00 EDT 1978 · Weld. Res. Abroad; (United States)

OSTI ID:6391471

Levine, E; Hill, D C

This study has demonstrated that Nb exerts a strong influence on the microstructure of weldments produced in HSLA steel for a range of cooling times representative of seam welds in line pipe. Through this influence a lath microstructure, characterized by low angle boundaries between laths and the absence of boundary ferrite, results. This microstructure understandably has poor impact properties. V exerts considerably less influence on weld metal microstructure. In fact the acicular ferrite structure surrounded by boundary ferrite characteristic of micro-alloy-free weld metal seems little affected by V content. As a result the impact properties of these weld metals are superior to those containing > 0.2% Nb. Mo exhibits a salutary effect in this microstructure by reducing the amount of boundary ferrite.

• Research Organization: Union Carbide Corp., Tarrytown, NY
• OSTI ID: 6391471
• Journal Information: Weld. Res. Abroad; (United States), Vol. 24:8
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
FILLER METALS
FRACTURE PROPERTIES
MICROSTRUCTURE
MANGANESE ALLOYS
WELDED JOINTS
STEELS
MECHANICAL PROPERTIES
NIOBIUM ADDITIONS
PLATES
VANADIUM ADDITIONS
ALLOYS
CRYSTAL STRUCTURE
IRON ALLOYS
IRON BASE ALLOYS
JOINTS
NIOBIUM ALLOYS
VANADIUM ALLOYS
360101* - Metals & Alloys- Preparation & Fabrication
360102 - Metals & Alloys- Structure & Phase Studies
360103 - Metals & Alloys- Mechanical Properties