Weldability and toughness assessment of Ti-microalloyed offshore steel

被引：0
作者：
I. Rak
V. Gliha
M. Koçak
机构：
[1] University of Maribor,the Faculty of Mechanical Engineering
[2] the GKSS Research Center Geesthacht,undefined
来源：
Metallurgical and Materials Transactions A | 1997年 / 28卷
关键词：
Ferrite; Weld Metal; Acicular Ferrite; High Heat Input Weld; Ferrite Side Plate;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
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.
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页码：199 / 206
页数：7
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