期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2014.10.057
关键词
Steel; Submerged arc welding; Mechanical characterization; Precipitation; Carbonitrides
类别
资金
- ESPRC
- European Commission [NMP3-SL-2009-229108]
- EPSRC [EP/M50726X/1] Funding Source: UKRI
The role of micro-alloying in the submerged arc welding (SAW) of high strength low alloy steel linepipe is paramount in facilitating the high strength properties of the linepipe. In this study, transmission electron microscopy analysis revealed the presence of large (0.85 mu m) Ti (C,N) precipitates within the predominantly acicular ferrite SAW joint. Cross-weld Vickers hardness and Charpy impact tests revealed that the fusion zone has high hardness and low toughness properties in relation to the base metal and heat affected zone. Fractography observations made on the ductile fracture surface of the fusion zone revealed a high number of the large Ti (C,N) precipitates to be located within the microvoids - suggesting their role in nucleating microvoids. Finally, fracture micro-mechanics are used to evaluate the relationship between the coarse precipitates and reduced strength-toughness properties in the SAW weld of the API-5L grade X65 linepipe steel. (C) 2014 Elsevier B.V. All rights reserved.
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