Erosion–corrosion resistance of Mo–Ti- and Ni–Cr–Mo-alloyed medium-carbon martensitic steels: a critical analysis of synergistic effect of erosion and corrosion
1 School of Mechanical and Vehicle Engineering, West Anhui University, Luan 237012, Anhui, China; 2 The State Key Laboratory of Refractories and Metallurgy, Hubei Province Key Laboratory of Systems Science on Metallurgical Processing, International Research Institute for Steel Technology, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China; 3 Laboratory for Excellence in Advanced Steel Research, Materials Science and Engineering Program, Department of Metallurgical, Materials and Biomedical Engineering, University of Texas at El Paso, El Paso, TX 79968, USA
Erosion–corrosion resistance of Mo–Ti- and Ni–Cr–Mo-alloyed medium-carbon martensitic steels: a critical analysis of synergistic effect of erosion and corrosion
1 School of Mechanical and Vehicle Engineering, West Anhui University, Luan 237012, Anhui, China; 2 The State Key Laboratory of Refractories and Metallurgy, Hubei Province Key Laboratory of Systems Science on Metallurgical Processing, International Research Institute for Steel Technology, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China; 3 Laboratory for Excellence in Advanced Steel Research, Materials Science and Engineering Program, Department of Metallurgical, Materials and Biomedical Engineering, University of Texas at El Paso, El Paso, TX 79968, USA
摘要 Grain refinement renders Mo–Ti-alloyed medium-carbon martensitic steel to exhibit high hardness, high strength, and good toughness, but the erosion–corrosion resistance of steel in a corrosive slurry environment is not known. Mo–Ti-alloyed medium-carbon martensitic steel is compared with Ni–Cr–Mo-alloyed medium-carbon martensitic steel, and the erosion– corrosion resistance of those two steels under impingement by NaCl solution with gravels has been investigated. Three components, pure-corrosion rate, pure-erosion rate, and synergistic effect of erosion and corrosion (SEEC) of erosion– corrosion rate, were quantified. The pure-corrosion and pure-erosion rates of Mo–Ti-alloyed steel were higher than those of Ni–Cr–Mo-alloyed one; however, its erosion–corrosion rate was relatively lower because of a weak SEEC. Surface plastic deformation and work hardening due to gravel impingement were the essential reason for SEEC, which could be reduced by grain refinement, and consequently, Mo–Ti-alloyed steel with finer grains had better erosion–corrosion resistance. Grain refinement could be an effective way to improve the erosion–corrosion resistance of martensitic steels.
Abstract：Grain refinement renders Mo–Ti-alloyed medium-carbon martensitic steel to exhibit high hardness, high strength, and good toughness, but the erosion–corrosion resistance of steel in a corrosive slurry environment is not known. Mo–Ti-alloyed medium-carbon martensitic steel is compared with Ni–Cr–Mo-alloyed medium-carbon martensitic steel, and the erosion– corrosion resistance of those two steels under impingement by NaCl solution with gravels has been investigated. Three components, pure-corrosion rate, pure-erosion rate, and synergistic effect of erosion and corrosion (SEEC) of erosion– corrosion rate, were quantified. The pure-corrosion and pure-erosion rates of Mo–Ti-alloyed steel were higher than those of Ni–Cr–Mo-alloyed one; however, its erosion–corrosion rate was relatively lower because of a weak SEEC. Surface plastic deformation and work hardening due to gravel impingement were the essential reason for SEEC, which could be reduced by grain refinement, and consequently, Mo–Ti-alloyed steel with finer grains had better erosion–corrosion resistance. Grain refinement could be an effective way to improve the erosion–corrosion resistance of martensitic steels.
De-fa Li,Hang-yu Dong,Cheng-yang Hu, et al. Erosion–corrosion resistance of Mo–Ti- and Ni–Cr–Mo-alloyed medium-carbon martensitic steels: a critical analysis of synergistic effect of erosion and corrosion[J]. Journal of Iron and Steel Research International, 2022, 29(08): 1299-1311.
2022, Vol. 29 
