Chen Shiqi, Yan Pei, Zhu Junyi, Wang Yubin, Zhao Wenxiang, Jiao Li, Wang Xibin
Key Laboratory of Fundamental Science for Advanced Machining, Beijing Institute of Technology, Beijing 100081, China.
Materials (Basel). 2023 Jan 15;16(2):843. doi: 10.3390/ma16020843.
Superalloy parts place high demands on machined surface integrity and serviceability. In the machining process of superalloys, the cutting fluid is usually used to improve the machining performance. Cutting fluids with cooling and lubrication functions have a relatively large effect on the surface microstructure and residual stress as well. The corrosion damage caused by cutting fluid to the machined surface, during machining and residual, are also worth considering. In this paper, the machining performance of typical binary Ni Cr solid solution, age-hardened, nickel-based superalloy NiCr20TiAl T6, under two commonly used cutting fluids, Blasocut and E709, was analyzed, including cutting performance, surface quality, machining surface corrosion characteristics, and so on. The results showed that the surface residual stress could be improved by adding both cutting fluids compared with the deionized water. Blasocut had better lubrication properties, which could reduce friction and heat production. Pitting holes were found on the polished surface after 45 days with E709 cutting fluid, which was more corrosive than Blasocut. According to this research, a reasonable cutting fluid can be selected to reduce the surface corrosion and improve the service life and performance of parts.
高温合金零件对加工表面完整性和使用性能有很高要求。在高温合金的加工过程中，通常使用切削液来提高加工性能。具有冷却和润滑功能的切削液对表面微观结构和残余应力也有较大影响。切削液在加工过程中和加工后对加工表面造成的腐蚀损伤也值得考虑。本文分析了典型的二元镍铬固溶时效硬化镍基高温合金NiCr20TiAl T6在两种常用切削液Blasocut和E709下的加工性能，包括切削性能、表面质量、加工表面腐蚀特性等。结果表明，与去离子水相比，添加这两种切削液均可改善表面残余应力。Blasocut具有更好的润滑性能，可减少摩擦和热量产生。使用E709切削液45天后，在抛光表面发现了点蚀孔，其腐蚀性比Blasocut更强。根据本研究，可以选择合理的切削液来减少表面腐蚀，提高零件的使用寿命和性能。
