State Key Laboratory of Metal Matrix Composites, School of Material Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
School of Material Science and Engineering, Tianjin University, Tianjin 300072, China.
Ultrason Sonochem. 2019 Nov;58:104668. doi: 10.1016/j.ultsonch.2019.104668. Epub 2019 Jul 2.
To enhance the cavitation erosion resistance of industrial components, two types of Cr-rich diffusion layers were fabricated on 316L stainless steel through pack chromizing process. The chromizing layer before post heat treatments exhibited poor cavitation erosion performances, which could be ascribed to its high brittleness and the galvanic corrosion. The chromizing layer after post heat treatments showed the excellent cavitation erosion resistance with a 3.97 times lower erosion mass loss compared with that of 316L stainless steel. The corrosion resistance was significantly improved with a 12.5-time lower free corrosion current density than 316L stainless steel, and the surface mechanical properties of chromizing layer also exhibited great combination of hardness and toughness. Therefore, the higher cavitation resistance was attributed to the better corrosion and mechanical performances originating from the more homogeneous microstructure after post heat treatments.
为了提高工业部件的抗空蚀能力，通过包埋渗铬工艺在 316L 不锈钢上制备了两种类型的富铬扩散层。未经后热处理的渗铬层表现出较差的抗空蚀性能，这可归因于其高脆性和电偶腐蚀。经过后热处理的渗铬层表现出优异的抗空蚀能力，其空蚀质量损失比 316L 不锈钢低 3.97 倍。耐腐蚀性显著提高，自腐蚀电流密度比 316L 不锈钢低 12.5 倍，渗铬层的表面力学性能也表现出硬度和韧性的良好结合。因此，较高的抗空蚀能力归因于后热处理后更均匀的微观结构带来的更好的腐蚀和力学性能。
