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.
基金
support from National Natural Science Foundation of China(Grant Nos.U20A20279,12072245,and 52071238)
High Technical Key Project of Hubei Province(2021BAA057)
Taishan Industrial Talent Project,Wuhan University,of Science and Technology,(Grant No.2018 TDX07)and i11 Project(D18018)。
