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논문 기본 정보

자료유형
학술저널
저자정보
L. R. Jacobo (Universidad Michoacana de San Nicolás de Hidalgo) R. García‑Hernández (Universidad Michoacana de San Nicolás de Hidalgo) V. H. López‑Morelos (Universidad Michoacana de San Nicolás de Hidalgo) A. Contreras (Instituto Mexicano del Petróleo)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.10
발행연도
2021.10
수록면
3,750 - 3,764 (15page)
DOI
10.1007/s12540-020-00805-7

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The effect of acicular ferrite (AF) and bainite (B) obtained by heat treatment (HT) applied to an API X70 steel on corrosionresistance and stress corrosion cracking (SCC) susceptibility was evaluated through polarization curves and slow strain ratetests respectively, in NS4 solution and congenital water (CW). The HT was carried out at 1050 °C for 15 and 30 min followedby water quenching. Change of ferrite?perlite to AF and B was observed as result of heat treatment applied to X70steel. Effect of HT time in terms of microstructure obtained was analysed. The mechanical properties obtained by the HTare higher than X100 steel. HT-30 min improve the corrosion resistance of X70 steel exposed to both solutions, which arerelated to coarse and homogeneous microstructure of AF and B. Localized corrosion was observed in the steel exposed toboth solutions. HT-15 min improve mechanical properties and higher content of fine AF, but decreases SCC resistance. Steel with higher content of fine AF microstructure is more susceptible to SCC. SCC indexes revealed that the heat-treatedsteel could be susceptible to SCC in CW confirmed by the secondary cracks observed. The SCC mechanism was hydrogenembrittlement. Meanwhile, steel HT by 15 min exposed to NS4 solution could be susceptible to SCC. Crack growth rate washigher in steel HT by 15 min, which are related to more fine and brittle AF microstructure.

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