Weldability and toughness assessment of Ti-microalloyed offshore steel

Journal Article · Wed Jan 01 04:00:00 EST 1997 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/s11661-997-0096-4· OSTI ID:438595

Rak, I; Gliha, V ^[1]; Kocak, M ^[2]

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1. Univ. of Maribor (Slovenia). Faculty of Mechanical Engineering
2. GKSS Research Center Geesthacht (Germany)

The present study has been carried out to investigate the coarse-grained heat-affected zone (CGHAZ) microstructure and crack tip opening displacement (CTOD) toughness of grade StE 355 Ti-microalloyed offshore steels. Three parent plates (40-mm thick) were studied, two of which had Ti microalloying with either Nb + V or Nb also present. As a third steel, conventional StE 355 steel without Ti addition was welded for comparison purposes. Multipass tandem submerged arc weld (SAW) and manual metal arc weld (SMAW) welds were produced. Different heat-affected zone (HAZ) microstructures were simulated to ascertain the detrimental effect of welding on toughness. All HAZ microstructures were examined using optical and electron microscopy. It can be concluded that Ti addition with appropriate steel processing, which disperses fine TiN precipitates uniformly, with a fine balance of other microalloying elements and with a Ti/N weight ratio of about 2.2, is beneficial for HAZ properties of StE 355 grade steel.

• Sponsoring Organization: USDOE
• OSTI ID: 438595
• Journal Information: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 1 Vol. 28; ISSN 1073-5623; ISSN MMTAEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
42 ENGINEERING
CHEMICAL COMPOSITION
ELECTRON MICROSCOPY
EMBRITTLEMENT
FRACTURE PROPERTIES
HEAT AFFECTED ZONE
LOW ALLOY STEELS
MICROSTRUCTURE
NIOBIUM
OFFSHORE PLATFORMS
OPTICAL MICROSCOPY
PRECIPITATION
TITANIUM
VANADIUM
WELDED JOINTS