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Microstructural Evolution and Properties of 24CrNiMoY Alloy Steel Fabricated by Selective Laser Melting

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Abstract

24CrNiMoY alloy steel samples were fabricated by selective laser melting (SLM), and a phase transformation model was established to study the alloy steel microstructural evolution. Meanwhile, microhardness and tensile properties of 24CrNiMoY alloy steel prepared by different laser energy densities (Ev) were investigated. Results indicate that the microstructural evolution of 24CrNiMoY alloy steel is consistent with the phase transformation model. The main microstructure changed from martensite to bainite with the increase in thermal cycle numbers. In addition, a suitable Ev plays an important role in refining the bainite structure and improving the alloy steel properties. When the Ev decreases from 210 to 140 J/mm3, the bainite lath width reduces from 1.7 to 0.6 μm. Simultaneously, the relative density, tensile strength and microhardness of the fabricated samples increase first and decrease later. 24CrNiMoY alloy steel sample prepared by 160 J/mm3 has fine mechanical properties: The tensile strength is 850 MPa and microhardness is 360 HV0.2.

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Acknowledgments

This work was financially supported by the National Key R&D Program of China (No.2016YFB1100201), the Green Manufacturing System Integration Project of the Industry and Information Ministry of China (2017), and the Research and development plan for the future emerging industries in Shenyang (No.18-004-2-26).

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Authors and Affiliations

  1. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Key Laboratory for Laser Application Technology and Equipment of Liaoning Province, School of Materials and Engineering, Northeastern University, Shenyang, 110819, Liaoning, China

    Lianyun Xi, Suiyuan Chen, Mingwei Wei, Jing Liang & Changsheng Liu

  2. Shenyang Dalu Laser Technology Co. Ltd, Shenyang, 110819, Liaoning, China

    Mei Wang

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  1. Lianyun Xi
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Correspondence to Suiyuan Chen.

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Xi, L., Chen, S., Wei, M. et al. Microstructural Evolution and Properties of 24CrNiMoY Alloy Steel Fabricated by Selective Laser Melting. J. of Materi Eng and Perform 28, 5521–5532 (2019). https://doi.org/10.1007/s11665-019-04280-z

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