Reference number : GC-2017-Q1-00570, amendment number : , agreement type : G, recipient legal name : Jahazi, Mohammad (École de technologie supérieure), recipient country : CA, recipient province : nan, recipient city : Quebec|Québec, recipient postal code : nan, program name english : Engage Plus Grants for Universities, program name french : Subvention d'engagement partenarial Plus pour les universités, program purpose english : Welded pipeline steels made of 316 or 316L grade stainless steels are widely used in oil and gas industry_x000D_
mainly for the transportation of very corrosive substances. One of the main challenges in welding of these_x000D_
steels is the occurrence of discoloration of the weld region which results often in the rejection of the part._x000D_
While the industrial practice is based on AWS D18.2 standard; however, the acceptable level of oxygen is not_x000D_
identified and often a weld, which might be good, is rejected because of apparent discoloration. In the first_x000D_
phase of the project carried out under the Engage Grant a methodology was developed to reveal the_x000D_
microstructure of the samples welded under different welding conditions. Specifically, the influences of 50 and_x000D_
500ppm of oxygen content on the discoloration level in comparison with the AWS D18.2 standard was_x000D_
assessed and quantified. The microstructure under each specific condition was revealed and examined. The_x000D_
mechanical and chemical heterogeneities were also revealed and identified. Based on the results of the first_x000D_
phase, the second phase was defined with the objective to further study the influence of surface preparation and_x000D_
oxygen content for other welding conditions and therefore to widen the scope of the study carried out in the_x000D_
first phase of the project. It is expected that the results of this project will allow proposing a new criteria for_x000D_
quantifying the influence of processing conditions on the actual damage to the microstructure., program purpose french : Welded pipeline steels made of 316 or 316L grade stainless steels are widely used in oil and gas industry_x000D_
mainly for the transportation of very corrosive substances. One of the main challenges in welding of these_x000D_
steels is the occurrence of discoloration of the weld region which results often in the rejection of the part._x000D_
While the industrial practice is based on AWS D18.2 standard; however, the acceptable level of oxygen is not_x000D_
identified and often a weld, which might be good, is rejected because of apparent discoloration. In the first_x000D_
phase of the project carried out under the Engage Grant a methodology was developed to reveal the_x000D_
microstructure of the samples welded under different welding conditions. Specifically, the influences of 50 and_x000D_
500ppm of oxygen content on the discoloration level in comparison with the AWS D18.2 standard was_x000D_
assessed and quantified. The microstructure under each specific condition was revealed and examined. The_x000D_
mechanical and chemical heterogeneities were also revealed and identified. Based on the results of the first_x000D_
phase, the second phase was defined with the objective to further study the influence of surface preparation and_x000D_
oxygen content for other welding conditions and therefore to widen the scope of the study carried out in the_x000D_
first phase of the project. It is expected that the results of this project will allow proposing a new criteria for_x000D_
quantifying the influence of processing conditions on the actual damage to the microstructure., agreement title english : Influence of Oxygen content and surface condition on weld quality of pipeline steels, agreement title french : Influence of Oxygen content and surface condition on weld quality of pipeline steels, agreement number : EGP2, agreement value : 12500.0, agreement start date : 2017-06-14, agreement end date : nan, description english : nan, description french : nan, expected results english : nan, expected results french : nan, additional information english : Grant or Award spanning more than one fiscal year. (2017-2018 to 2018-2019), additional information french : Subvention ou bourse octroyée s'appliquant à plus d'un exercice financier. (2017-2018 à 2018-2019), owner organization : nserc-crsng, owner organization title : Natural Sciences and Engineering Research Council of Canada | Conseil de recherches en sciences naturelles et en génie du Canada