STUDY ON ALTERNATE IMMERSION CORROSION BEHAVIOR AND MECHANISM OF SDCM DIE STEEL FOR HOT STAMPING

  • Jiang Bin College of Materials Science and Engineering, Shanghai University, Shanghai 200444
  • Zuo Pengpeng College of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
  • Wu Xiaochun College of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
Keywords: stress corrosion; hardness; corrosion rate; hot stamping die steel;

Abstract

In this paper, the alternate immersion corrosion test of Cr-Mo-V series SDCM steel for hot stamping was carried out, and different stresses were loaded with self-made fixture. The results shown that regardless of hardness and stress, the corrosion mode of the material is uniform corrosion. Stress could significantly increase the corrosion rate, with lower hardness and higher corrosion rate. Because of the existence of Corrosion Removal Layer (CRL), the maximum corrosion pit depth would be reduced. The maximum corrosion pit depth and Corrosion Pit density (CPD, ρv) were used to describe the degree of corrosion damage. From low to high hardness, the CPD ρv and corrosion resistance increased gradually. With the increased of tempering temperature, the hardness decreased, and the percentage of carbide area in the field of view increased from 16.36% to 24.32%. The irregular spherical carbide M23(C, N)6 rich in Cr coarsens and consumes Cr element in the material, which lead to the decrease of corrosion resistance. Through the polarization curve of the dynamic potential, we known that the current density was increased with the hardness decreased, from 28.53 μA/mm2 to 40.93 μA/mm2.

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Published
2021-09-30
How to Cite
1.
Bin J, Pengpeng Z, XiaochunW. STUDY ON ALTERNATE IMMERSION CORROSION BEHAVIOR AND MECHANISM OF SDCM DIE STEEL FOR HOT STAMPING. MatTech [Internet]. 2021Sep.30 [cited 2021Nov.28];55(5):681–692. Available from: https://mater-tehnol.si/index.php/MatTech/article/view/192