CORROSION BEHAVIOUR OF ANNEALED 42CrMo4 STEEL
Abstract
In this paper, the corrosion behaviour of 42CrMo4 low-alloy steel after normalizing, soft annealing, spheroidizing annealing and full annealing is investigated. 42CrMo4 is steel for quenching and tempering, and one of the widely used and studied steels due to its good combination of mechanical properties. Sometimes, it is used in the annealed condition. Nevertheless, the corrosion properties of 42CrMo4 steel are poorly studied, especially in the annealed condition. The main objective of this work is to increase the knowledge about the corrosion behaviour of the investigated alloy. The mechanical and microstructure properties of the samples after different annealing processes were characterised with hardness testing, optical and scanning electron microscopy (SEM) and X-ray diffraction (XRD). Measurements of the open-circuit potential and potentiodynamic polarisation of the samples after different annealing processes were carried out in a naturally aerated solution. It was found that the corrosion rate of the soft annealed samples was higher than that of the spherical and full annealed samples. Moreover, full annealing resulted in a significant improvement in the corrosion resistance.
References
2 Krauss G., Steels: Heat Treatment and Processing Principles, ASM International, 1990.
3 Totik, Y. (2005). The Corrosion Behavior of AISI 4140 Steel Subjected to Different Heat Treatments. Corrosion Reviews, 23 (4-5-6), 379-390. https://doi.org/10.1515/corrrev.2005.23.4-5-6.379
4 Totik, Y. (2006). The corrosion behaviour of manganese phosphate coatings applied to AISI 4140 steel subjected to different heat treatments. Surface And Coatings Technology, 200(8), 2711-2717. https://doi.org/10.1016/j.surfcoat.2004.10.004
5 Totten G.E., Steel Heat Treatment: Metallurgy and Technologies, 2nd ed., CRC Press, Taylor & Francis Group, 2007.
6 Fattah, M., Mahboubi, F. (2011). Microstructure Characterization and Corrosion Properties of Nitrocarburized AISI 4140 Low Alloy Steel. Journal Of Materials Engineering And Performance, 21(4), 548-552. https://doi.org/10.1007/s11665-011-9922-3
7 Khani Sanij, M., Ghasemi Banadkouki, S., Mashreghi, A., Moshrefifar, M. (2012). The effect of single and double quenching and tempering heat treatments on the microstructure and mechanical properties of AISI 4140 steel. Materials &Amp; Design, 42, 339-346. https://doi.org/10.1016/j.matdes.2012.06.017
8 Katiyar, P., Misra, S., Mondal, K. (2019). Corrosion Behavior of Annealed Steels with Different Carbon Contents (0.002, 0.17, 0.43 and 0.7% C) in Freely Aerated 3.5% NaCl Solution. Journal Of Materials Engineering And Performance, 28(7), 4041-4052. https://doi.org/10.1007/s11665-019-04137-5
9 Hafeez, M., Farooq, A. (2019). Effect of Heat Treatments on the Mechanical and Electrochemical Corrosion Behavior of 38CrSi and AISI 4140 Steels. Metallography, Microstructure, And Analysis, 8(4), 479-487. https://doi.org/10.1007/s13632-019-00556-x
10 Szala, M., Winiarski, G., Wójcik, Ł., Bulzak, T. (2020). Effect of Annealing Time and Temperature Parameters on the Microstructure, Hardness, and Strain-Hardening Coefficients of 42CrMo4 Steel. Materials, 13(9), 2022. https://doi.org/10.3390/ma13092022
11 Çalık, A., Dokuzlar, O., Uçar, N. (2020). The effect of heat treatment on mechanical properties of 42CrMo4 steel. Journal Of Achievements In Materials And Manufacturing Engineering, 1(98), 5-10. https://doi.org/10.5604/01.3001.0014.0811
12 Sarıoğlu, F. (2001). The effect of tempering on susceptibility to stress corrosion cracking of AISI 4140 steel in 33% sodium hydroxide at 80°C. Materials Science And Engineering: A, 315(1-2), 98-102. https://doi.org/10.1016/s0921-5093(01)01198-4
13 Zhu, F., Luo, X., Chai, F., Yang, C., Zhang, Z. (2020). Effect of double quenching process and tempering temperature on the microstructure and mechanical properties of a High Strength Low Alloy Steel. IOP Conference Series: Materials Science And Engineering, 772(1), 012010. https://doi.org/10.1088/1757-899x/772/1/012010
14 Surface Morphology of Metal Electrodeposits. In: Fundamental Aspects of Electrometallurgy. Springer, Boston, MA, (2002), doi: 10.1007/0-306-47564-2_3
15 Wei, J., Zhou, Y., Dong, J., He, X., Ke, W. (2019). Effect of cementite spheroidization on improving corrosion resistance of pearlitic steel under simulated bottom plate environment of cargo oil tank. Materialia, 6, 100316. https://doi.org/10.1016/j.mtla.2019.100316