Surface Nano-Crystallisation by shot peening using in-process monitoring and temperature control (NanoPeen)

喷丸是一种通过在零件表面施加压应力来提高疲劳寿命的公认方法。然而，多年来人们已经知道，喷丸也可以产生表面纳米晶层(SNC)，这可以使零件性能发生阶段性变化，包括提高耐磨性和耐腐蚀性，以及抗菌性能。遗憾的是，由于难以控制喷丸过程以获得均匀的SnC层，因此不可能在商业上开发这种有益的“副产品”。此外，喷丸过程中的局部热积累降低了形成SnC层的速度，这意味着处理时间可能比传统喷丸长一个数量级，从而使该过程在商业上缺乏吸引力。NanoPeen项目试图克服这一采用障碍。概念验证将通过测试使用该工艺处理的工业演示部件的改进性能来进行。

Shot peening is an established method of improving fatigue life by imparting compressive stress in the surface of parts. However, it has been known for many years that shot peening can also generate a surface nanocrystalline (SNC) layer which can give a step change in part performance, including increased wear and corrosion resistance, as well as antibacterial properties. Unfortunately, it has not been possible to commercially exploit this beneficial “by product” due to the difficulty in controlling the shot peening process to give an even SNC layer. In addition, localised heat build-up during the shot peening process reduces the speed with which the SNC layer is formed which means that processing time can be an order of magnitude longer than for conventional shot peening thus making the process commercially unattractive. The NanoPeen project seeks to overcome this barrier to adoption. Proof-of-concept will be demonstrated by testing the improved performance of an industrial demonstration part treated using the process.