Cavitation erosion behaviors of surface chromizing layer on 316L stainless steel
Cavitation erosion behaviors of surface chromizing layer on 316L stainless steel
复制标题
316L不锈钢表面渗铬层空蚀行为
DOI：
10.1016/j.ultsonch.2019.104668
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发表时间：
2019-11-01
影响因子：
8.4
通讯作者：
Liu, Lei
中科院分区：
文献类型：
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作者：
Dong, Zhihao;Zhou, Tong;Liu, Lei
为提高工业零件的抗空蚀性能，采用固体渗铬工艺在316L不锈钢表面制备了两种富铬扩散层。未经过热处理的渗铬层的空蚀性能较差，这与渗铬层的脆性和电偶腐蚀有关。经后热处理的渗铬层具有良好的抗空蚀性能，其空蚀失重是316L不锈钢的3.97倍。渗铬层的自腐蚀电流密度比316L不锈钢低12.5倍，耐蚀性显著提高，渗铬层的表面力学性能也表现出良好的硬度和韧性配合。因此，更高的抗空蚀性归因于更好的腐蚀和机械性能源于更均匀的组织后热处理后。
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.