Abstract
In the present work, rocker arm low AISI 8620 and needle-nose pliers martensitic stainless AISI 420 steels, obtained from melting and gravity casting processes, were analyzed during the homogenizing treatment. The as-cast steel specimens were microstructural and mechanically characterized by optical microscope, scanning electron microscope, and hardness test. In the case of AISI 8620 steel, the observed microstructure was ferrite and carbides with a hardness of 26 HRC. In contrast, the observed microstructure was ferrite and two types of carbides with a hardness of 52 HRC for the AISI 420 steel. Both steel specimens were homogenized in the austenite region. The homogenizing temperature was determined using the Thermo-Calc calculated equilibrium pseudobinary phase diagrams. The homogenizing time was obtained by Dictra software. The homogenizing temperature and time were 900 °C and 8 × 104 s (22 h), respectively, for the AISI 8620 steel, and 1040 °C and 7 × 104 s (19 h), respectively, for the AISI 420 steel. The results showed that the homogenized microstructure was ferrite, cementite (pearlite), and M23C6 carbides with a hardness of 88 HRB for AISI 8620 steel, and ferrite and M23C6 carbides with a hardness of 43 HRC for AISI 420 steel.
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The authors wish to thank the financial support from SIP-COFAA-IPN and CONACYT A1-S-9682.
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© 2024 The Minerals, Metals & Materials Society
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Lopez-Hirata, V.M., Saucedo-Muñoz, M.L., Rodríguez-Rodríguez, K., Dorantes-Rosales, H.J. (2024). Homogenizing Treatment of AISI 420 Stainless and AISI 8620 Steels. In: Peng, Z., et al. Characterization of Minerals, Metals, and Materials 2024. TMS 2024. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-031-50304-7_48
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DOI: https://doi.org/10.1007/978-3-031-50304-7_48
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