Cavitation erosion behaviors of surface chromizing layer on 316L stainless steel

Zhihao Dong; Tong Zhou; Jie Liu; Xinwen Zhang; Bin Shen; Wenbin Hu; Lei Liu

doi:10.1016/j.ultsonch.2019.104668

Cavitation erosion behaviors of surface chromizing layer on 316L stainless steel

Ultrason Sonochem. 2019 Nov:58:104668. doi: 10.1016/j.ultsonch.2019.104668. Epub 2019 Jul 2.

Authors

Zhihao Dong¹, Tong Zhou¹, Jie Liu¹, Xinwen Zhang¹, Bin Shen¹, Wenbin Hu², Lei Liu³

Affiliations

¹ State Key Laboratory of Metal Matrix Composites, School of Material Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
² School of Material Science and Engineering, Tianjin University, Tianjin 300072, China.
³ State Key Laboratory of Metal Matrix Composites, School of Material Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai 200240, China. Electronic address: anodic@sjtu.edu.cn.

PMID: 31450372
DOI: 10.1016/j.ultsonch.2019.104668

Abstract

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.

Keywords: Cavitation erosion resistance; Corrosion behaviors; Pack chromizing; Stainless steel.