TY - JOUR
T1 - Improving pitting corrosion resistance at inclusions and ductility of a martensitic medium-carbon steel
T2 - Effectiveness of short-time tempering
AU - Kadowaki, Mariko
AU - Muto, Izumi
AU - Sugawara, Yu
AU - Doi, Takashi
AU - Kawano, Kaori
AU - Hara, Nobuyoshi
N1 - Funding Information:
This paper is based on results obtained from a project commissioned by the New Energy and Industrial Technology Development Organization (NEDO). This research was supported by JSPS KAK-ENHI grant Numbers JP15K14175 and JP17H01331. This work was also supported by the Program for Leading Graduate Schools, “Interdepartmental Doctoral Degree Program for Multi-dimensional Materials Science Leaders”, by the Ministry of Education, Culture, Sports, Science and Technology.
Publisher Copyright:
© The Author(s) 2018. Published by ECS.
PY - 2018
Y1 - 2018
N2 - The optimal tempering conditions for a martensitic medium-carbon steel (0.47 mass% C) were investigated in terms of balancing ductility and pitting corrosion resistance. By tempering the as-quenched martensite, its Vickers hardness drastically decreased within 0.1 h, suggesting that ductility was sufficiently recovered by short-time tempering. Based on the results of micro-scale polarization in boric-borate buffer solutions with NaCl (pH 8.0), stable pits were initiated at non-metallic inclusions in the specimens tempered for at least 1 h; however, no stable pit was generated on the 0.1 h tempered and as-quenched specimens. Short-time tempering of martensite was suggested to be a feasible approach to striking an optimal balance between facilitating pitting corrosion resistance and achieving the desired mechanical properties of martensitic carbon steels.
AB - The optimal tempering conditions for a martensitic medium-carbon steel (0.47 mass% C) were investigated in terms of balancing ductility and pitting corrosion resistance. By tempering the as-quenched martensite, its Vickers hardness drastically decreased within 0.1 h, suggesting that ductility was sufficiently recovered by short-time tempering. Based on the results of micro-scale polarization in boric-borate buffer solutions with NaCl (pH 8.0), stable pits were initiated at non-metallic inclusions in the specimens tempered for at least 1 h; however, no stable pit was generated on the 0.1 h tempered and as-quenched specimens. Short-time tempering of martensite was suggested to be a feasible approach to striking an optimal balance between facilitating pitting corrosion resistance and achieving the desired mechanical properties of martensitic carbon steels.
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U2 - 10.1149/2.0071811jes
DO - 10.1149/2.0071811jes
M3 - Article
AN - SCOPUS:85065554182
SN - 0013-4651
VL - 165
SP - C711-C721
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
IS - 11
ER -
