Advanced alloy surface modification using ultrasonic pulsed waterjets

使用超声波脉冲水射流进行先进合金表面改性

• 批准号: 521123-2018
• 负责人: Plucknett, Kevin
• 金额: $ 14.39万
• 依托单位: Dalhousie University
• 依托单位国家: 加拿大
• 项目类别: Strategic Projects - Group
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=697846
• 关键词: Advanced; alloy; surface; modification; using

Surface modification of metallic alloys is an important method for improving properties such as fatigue, wear resistance, and even the corrosion susceptibility. Traditionally, this can be achieved by shot peening or grit blasting, while laser shock peening techniques are also now available. Recently, a novel ultrasonic pulsed waterjet manufacturing technique has been developed by VLN Advanced Technologies (Ottawa, ON). This method allows precision metal cutting and controlled removal of surface coatings (e.g., hard chromium plating). However, it has also been demonstrated that surface peening may be possible, with the waterjet technique being much more environmentally friendly, and physically cleaner, than conventional shot peening. The proposed research, in collaboration with both VLN and GKN Sinter Metals (St. Thomas, ON), will investigate the fundamental physical mechanisms operating during ultrasonic waterjet peening, particularly in terms of potential cavitation phenomena, and the associated materials interactions. The effects of waterjet peening will be investigated for various aluminium, iron and titanium alloys, fabricated using either powder metallurgy or additive manufacturing, and compared to conventional wrought alloy variants. These materials are of great importance to the aerospace and automotive industries within Canada. The degree and depth of residual surface stress generated following peening will be quantified through X-ray diffraction, and the effects on a variety of physical and chemical properties will be investigated. Surface characterisation will be conducted using several profilometry and microscopy techniques. The pre- and post-peened fatigue response will be assessed. The wear and corrosion response of the peened materials will be investigated, as both are sensitive to the metallurgical surface condition, which will be strongly affected through peening treatments. The recrystallization response will also be assessed, using differential scanning calorimetry and electron back scatter diffraction. Successful completion of this multi-disciplinary project will provide a scientific and engineering validation of the technique, and an international competitive advantage for both VLN and GKN.

金属合金的表面修饰是改善诸如疲劳，耐磨性甚至腐蚀敏感性之类特性的重要方法。传统上，这可以通过射击或砂粒爆破来实现，而激光冲击式技术现在也可用。最近，VLN Advanced Technologies（Ottawa，On）开发了一种新型的超声波脉冲水衣制造技术。此方法允许精确的金属切割和控制表面涂层的去除（例如，硬铬镀层）。但是，还证明了表面剥离是可能的，而水夹技术比传统的射击更环保，身体更干净。拟议的研究与VLN和GKN烧结金属（圣托马斯，安大略省）合作，将研究在超声波式水剥皮期间运行的基本物理机制，尤其是在潜在的空化现象和相关材料相互作用方面。将研究使用粉末冶金或添加剂制造制造的各种铝，铁和钛合金的水同生的作用，并与传统的锻造合金变体相比。这些材料对加拿大境内的航空航天和汽车行业非常重要。将通过X射线衍射来量化脱皮后产生的残留表面应力的程度和深度，将研究对各种物理和化学性质的影响。表面表征将使用多种修订法和显微镜技术进行。将评估前后疲劳后的疲劳反应。将研究剥皮材料的磨损和腐蚀反应，因为两者都对冶金表面状况敏感，这将通过剥皮处理对此受到强烈影响。还将使用差分扫描量热法和电子背部散射衍射来评估重结晶响应。这个多学科项目的成功完成将为该技术提供科学和工程验证，并为VLN和GKN提供国际竞争优势。