Accelerated development of welding electrodes for abrasion-corrosion resistant overlay

设备和耗材的磨料磨损和腐蚀对加拿大工业有非常大的影响。具有耐磨料磨损和耐腐蚀性能的铁基合金焊条的市场需求非常大。我们的长期目标是更好地了解耐磨和耐腐蚀覆盖层的焊接冶金。本应用的目的是有效地设计一种新的自屏蔽、高铬、金属芯焊丝，用于耐磨损和耐腐蚀的覆盖层。本项目的技术目标是研究和控制焊缝微观结构，使覆盖层达到以下要求：(a) ASTM标准测定的耐磨性最大值为0.19g; (b) ASTM标准测定的耐腐蚀性不低于常规碳化铬覆盖层。这个拟议的研究和培训项目将应用系统的冶金方法来满足工业对成本有效的覆盖层的关键需求，以对抗磨损和腐蚀。该项目的实验核心包括在阿尔伯塔大学进行加速合金选择、线材设计和微观结构表征，在SSAB相关设施进行线材制造，以及在商业实验室进行实验覆盖层的磨损和腐蚀测试。工业赞助商SSAB已经为这个项目提供了研发和生产系统。阿尔伯塔大学的物理冶金实验室有专门的设备来测量钢的相变、机械性能、金相学、晶体结构和电子显微镜。实验任务将在化学成分、工艺参数、相变、抗裂性、硬度和耐腐蚀性之间相互作用的理论框架内进行。该项目的成果将通过建立化学成分，工艺窗口，并为其业务提供目前不可用的覆盖线，直接使工业合作伙伴SSAB受益。

Abrasive wear and corrosion of equipment and consumables have a very large impact on Canadian industry. There is a strong market demand for welding electrodes for iron-based alloy overlays that can resist both abrasive wear and corrosion. Our long-term goal is to better understand the welding metallurgy for wear and corrosion resistant overlays. The objective in this application is to efficiently design a new self-shielding, high-Cr, metal-cored welding wire for overlay that is resistant to wear and corrosion. The technical objectives of the project are to study and control the weld microstructure so that the overlay will meet the requirements: (a) the wear resistance measured by ASTM standard is 0.19g max, and (b) the corrosion resistance measured by ASTM standard is no worse than that of the conventional chromium carbide overlay plates. This proposed research and training project will apply a systematic metallurgical approach to the critical industrial need for cost effective overlay to counter both wear and corrosion. The experimental core for this project involves accelerated alloy selection and wire design and microstructure characterization at University of Alberta, wire fabrication at a SSAB associated facility, and wear and corrosion testing of experimental overlay at a commercial lab. The industrial sponsor, SSAB, has made its R&D and production systems available for this project. The physical metallurgy lab at the University of Alberta has specialized equipment for measuring phase transformations in steels, mechanical properties, metallography, crystal structures, and electron microscopy. The experimental tasks will be performed within a theoretical framework of interactions between chemical composition, process parameters, phase transformations, crack resistance, hardness, and corrosion resistance. The outcome of this project will directly benefit the industrial partner SSAB through the establishment of chemical composition, process windows, and providing the currently unavailable overlay wire for their business.