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.

金属合金的表面改性是改善疲劳、耐磨甚至腐蚀敏感性等性能的重要方法。传统上，这可以通过喷丸或喷砂来实现，而现在也可以使用激光冲击喷丸技术。最近，VLN Advanced Technologies（安大略省渥太华）开发了一种新型超声波脉冲水射流制造技术。这种方法可以实现精密金属切割并控制表面涂层（例如硬铬镀层）的去除。然而，事实也证明，表面喷丸是可能的，因为水射流技术比传统喷丸技术更加环保，而且物理上更清洁。拟议的研究将与 VLN 和 GKN Sinter Metals（安大略省圣托马斯）合作，研究超声波水射流喷丸过程中的基本物理机制，特别是潜在的空化现象和相关材料相互作用方面。将研究水射流喷丸对采用粉末冶金或增材制造制造的各种铝、铁和钛合金的影响，并与传统的变形合金进行比较。这些材料对加拿大的航空航天和汽车工业非常重要。将通过 X 射线衍射量化喷丸后产生的残余表面应力的程度和深度，并研究其对各种物理和化学性能的影响。将使用多种轮廓测定法和显微镜技术进行表面表征。将评估喷丸前和喷丸后的疲劳响应。将研究喷丸材料的磨损和腐蚀响应，因为两者都对冶金表面状况敏感，而喷丸处理会强烈影响冶金表面状况。还将使用差示扫描量热法和电子背散射衍射来评估重结晶响应。这一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 带来国际竞争优势。