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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium Pan American Materials Congress: Materials for Oil and Gas Industry
Presentation Title Effect of Heat Input on the Microstructure and Toughness of Welded API Pipelines
Author(s) Fernando Guzmán, Moisés Hinojosa, Eduardo Frías, Elisa Schaeffer
On-Site Speaker (Planned) Fernando Guzmán
Abstract Scope 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.
Proceedings Inclusion? Planned: Stand-alone book in which only your symposium’s papers would appear (indicate title in comments section below)


A Study on the Mechanisms Responsible for Dynamic Strain Aging Phenomenon in Inconel 718 Superalloy
Adsorption of Organosulfur Compounds on Doped Boron Nitride Nanostructures
Design and Thermo-mechanical Processing of Steel Grade APIX70 PSL2 for Use in Line-pipe at Oil&Gas Industry
Dynamic Transformation and Retransformation during the Simulated Plate Rolling of an X70 Pipeline Steel
Effect of Heat Input on the Microstructure and Toughness of Welded API Pipelines
Evaluation of Non-Destructive Techniques (Thermography, Ultrasound and Eddy Current) for Detection of Failures in Metallic Substrates with Composite Anticorrosive Coatings
High Temperature In-Situ X-ray Analysis of a Lean Duplex Stainless Steel
Materials for Facilities Liquefied Petroleum Gas as NFPA
PAN-27: Blends of PVDF with Its Processing Waste: Study of the Mechanical Properties of the Blends Thermally Aged
Structural Integrity of Pipelines
The Corrosion Behavior of Newly Developed API X120 Pipeline Steel in H2S and Moderate Temperature Environments

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