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Effect of Single-Pass and Overlapping Laser Surface Melting Process on Microstructure and Microhardness of AISI 431 Duplex Steel

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Abstract

Laser surface melting of AISI 431 duplex stainless steel was performed using an Nd:YAG pulsed laser. The single-pass laser melting stage was performed to select the optimal sample; and then, 10%, 30%, and 50% overlapping were applied on it. The results of microstructural studies showed that the single-pass laser melting process created a columnar structure due to epitaxial growth and a fully ferritic structure was formed in the molten zone. Also, the hardness of this region decreased from 440 to 130 HV. Moreover, with 50% and 30% overlapping, the reheating of the area adjacent to the molten zone provided the conditions for the formation of austenite from ferrite. Also, austenite transformed to martensite during the high-rate cooling and the final structure was martensite. With 50% overlapping, the hardness of the MZ increased compared with that of the single-pass sample from 130 to 320 HV.

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Authors and Affiliations

  1. Department of Materials Engineering, Malek-Ashtar University of Technology, Isfahan, Iran

    Alireza Shirzadi, Reza Shoja-Razavi, Majid Tavoosi & Mohammad Reza Dehnavi

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  1. Alireza Shirzadi
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  2. Reza Shoja-Razavi
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  3. Majid Tavoosi
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  4. Mohammad Reza Dehnavi
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Correspondence to Alireza Shirzadi.

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Shirzadi, A., Shoja-Razavi, R., Tavoosi, M. et al. Effect of Single-Pass and Overlapping Laser Surface Melting Process on Microstructure and Microhardness of AISI 431 Duplex Steel. Trans Indian Inst Met 76, 1643–1652 (2023). https://doi.org/10.1007/s12666-023-02873-w

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  • DOI: https://doi.org/10.1007/s12666-023-02873-w

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