|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Pan American Materials Congress: Materials for Oil and Gas Industry
||Effect of Heat Input on the Microstructure and Toughness of Welded API Pipelines
||Fernando Guzmán, Moisés Hinojosa, Eduardo Frías, Elisa Schaeffer
|On-Site Speaker (Planned)
In the manufacture of welded pipes for oil and gas transportation sometimes a failure known as Weld-Toe Crack occurs close to the fusion line on the Heat Affected Zone side. In order to better understand this failure, we propose a possible mechanism. We speculate that after crack initiation by stress concentration on the Widmanstätten ferrite (WF), propagation occurs either in a brittle manner on the Allotriomorphic ferrite (AlF) or in a ductile manner on the Acicular ferrite (AF). To test this a series of double joints were prepared in simple-wire tandem mode, the heat input was varied so as to modify the microstructure and toughness. We were able to minimize the AlF size and thus reduce the quantity of WF increasing that of AF, which resulted in higher values of toughness in according to the proposed mechanism.
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