Microstructural Development and Performance of Welds in Energy-Related Alloys

能源相关合金焊缝的微观结构发展和性能

• 批准号: RGPIN-2014-03767
• 负责人: Li, Leijun
• 金额: $ 1.82万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=657467
• 关键词: Microstructural; Development; Performance; Welds; Energy

The global demand for cheap energy pushes our industries to ever increase the efficiency and decrease the cost of natural resources exploitation. Energy exploitation equipment, such as drilling shafts, piping, and pressure vessels, are increasingly designed for higher temperature, higher pressure, and more severe chemical environments, which require the usage of higher-grade alloys, such as new chrome-moly steels and nickel-based superalloys. As an indispensible process for fabricating or repairing the equipment, welding generally induces unfavorable microstructure changes and thermal stresses in the joint, which often becomes the weakest link in a structure. **The Short-term Objectives in this application are (1) to conduct a well-justified study of microstructural evolution for selecting welding and post-weld heat treatment conditions, and to correlate microstructure with room-temperature and high-temperature strength of chrome-moly steel welds, and (2) to develop an innovative laser cladding process for a nickel-based superalloy to produce minimal dilution and distortion to the directional drilling shafts, and to prove rapid heating cycles during laser cladding will promote finer microstrucure and suppress the formation of detrimental phases. The educational objective of this program is to train future highly qualified personnel in non-equilibrium phase transformations of steels and superalloys, advanced mechanical testing methods, and numerical modeling of heterogeneous material performance. Our Long-term Objective is to develop a new welding metallurgy for advanced alloys in order to manufacture high-performing structures and maintain Canada's competitiveness in welding and metal fabrication for energy and natural resources. **The techno-economic impact of the proposed program on Canadian industry is expected to be very large. Firstly, the research results will directly enhance the efficiency and safety of hundreds of Cr-Mo steel structural units in chemical, power generating, and natural resources industries. The direct savings in the material cost of alloy shafts are estimated to be millions of dollars in Alberta alone. Secondly, the technical findings will contribute to materials engineering and physical metallurgy by offering new knowledge on the microstructure-process-properties relationship for an important class of engineering alloys. There will be expected technical innovations in the testing methods for chrome-moly steels, and new inventions in laser welding of precision and expensive Alloy 718. Last but not least, this research program will help maintain the applicant's track record in HQP training and serve as a unique platform for training high-quality graduate students in non-equilibrium physical metallurgy of critical alloys.

全球对廉价能源的需求促使我们的行业提高效率并降低自然资源的剥削成本。能源开发设备（例如钻孔轴，管道和压力容器）越来越多地针对更高的温度，更高的压力和更严重的化学环境，这些环境需要使用高级合金，例如新的镀铬钢钢和基于镍的超合金。作为制造或修理设备的不可或缺的过程，焊接通常会引起不利的微结构变化和关节中的热应力，这通常成为结构中最弱的连接。 **The Short-term Objectives in this application are (1) to conduct a well-justified study of microstructural evolution for selecting welding and post-weld heat treatment conditions, and to correlate microstructure with room-temperature and high-temperature strength of chrome-moly steel welds, and (2) to develop an innovative laser cladding process for a nickel-based superalloy to produce minimal dilution and distortion to the directional drilling轴，并证明激光覆层过程中的快速加热周期将促进更细的微疗法并抑制有害相的形成。该计划的教育目标是在钢和超合金的非平衡相变，高级机械测试方法以及异质材料性能的数值建模中培训未来高素质的人员。我们的长期目标是为高级合金开发一种新的焊接冶金，以制造高性能的结构，并保持加拿大在能源和自然资源方面的焊接和金属制造方面的竞争力。 **拟议计划对加拿大行业的技术经济影响预计将非常大。首先，研究结果将直接提高数百个CR-MO钢结构单元在化学，发电和自然资源行业中的效率和安全性。仅在艾伯塔省，据估计，合金轴的材料成本的直接节省量。其次，技术发现将通过为重要类型的工程合金提供有关微观结构过程中的新知识，从而为材料工程和物理冶金。在用于铬搅拌钢的测试方法中，将有预期的技术创新，以及在激光焊接精确和昂贵合金718的激光焊接中的新发明。最后但并非最不重要的一点是，该研究计划将有助于维持HQP培训中的申请人往绩，并作为非平衡型物理材料中的高品质研究生的独特平台。