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Influence of post-heat treatments on the mechanical properties of CX stainless steel fabricated by selective laser melting

  • Metals & corrosion
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Abstract

High-performance CX stainless steel was successfully manufactured using selective laser melting (SLM) technology, and different types of post-heat treatments were adopted for ameliorating the mechanical properties of as-built specimens. The microstructure evolution process (i.e., cell structures, cellular dendritic grains and blocky grains containing substructures) was explained using the rapid solidification theory after SLM. Nanoprecipitates and their hardening behavior in the SLM CX stainless steels in the as-built and solution-aged state were detected by transmission electron microscope (TEM). The results of high-resolution TEM showed that the massive needle-like nanoprecipitates with a size range of 3–25 nm (as-built sample) and 7–30 nm (solution-aged sample) were evenly distributed in the martensite matrix. In the meantime, the strengthening mechanism was analyzed and discussed. Moreover, various post-heat treatments exhibited a great influence upon the mechanical performances of the SLM CX stainless steel samples. The average micro-hardness of the SLM CX stainless steel parts was found to extremely improve from 357 HV0.2 (as-built sample) to 514 HV0.2 (solution-aged sample). On the contrary, the total impact energy (Wt) of the SLM CX stainless steel parts decreased from 83.8 J in the as-built condition to 5.3 J in the solution-aged condition.

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Acknowledgements

As one of the authors, Cheng Chang is grateful for the financial support from the program of China Scholarship Council (Grant #: 201801810106). As one of the authors, Xingchen Yan, is grateful for the financial supports provided founds of Sciences Platform Environment and Capacity Building Projects of GDAS (Grant #: 2019GDASYL-0402006, 2019GDASYL-0502006, 2019GDASYL-0402004, 2018GDASCX-0402, 2018GDASCX-0111 and 2019GDASYL-0501009), Guangzhou Project of Science & Technology (Grant #: 201909010008, 201807010030), Guangdong province Science and Technology Plan Projects (Grant #: 2017A070701027, 2017A070702016, 2014B070705007 and 2017B030314122).

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Authors and Affiliations

  1. ICD-LASMIS, UMR CNRS 6281, University of Technology of Troyes, 12 rue Marie Curie, CS 42060, 10004, Troyes Cedex, France

    Cheng Chang, Julien Gardan & Mahdi Chemkhi

  2. EPF, Ecole d’ingenieurs, 2 rue Fernand Sastre, Troyes, France

    Cheng Chang, Julien Gardan & Mahdi Chemkhi

  3. National Engineering Laboratory for Modern Materials Surface Engineering Technology, The Key Lab of Guangdong for Modern Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou, 510651, People’s Republic of China

    Xingchen Yan & Min Liu

  4. ICB-PMDM, UMR 6303, CNRS, Univ. Bourgogne Franche-Comté, UBFC, 71200, Le Creusot, France

    Xingchen Yan, Rodolphe Bolot, Shuohong Gao, Hanlin Liao & Sihao Deng

  5. UTBM, 90010, Belfort, France

    Xingchen Yan, Rodolphe Bolot, Shuohong Gao, Hanlin Liao & Sihao Deng

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  1. Cheng Chang
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Correspondence to Xingchen Yan.

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Chang, C., Yan, X., Bolot, R. et al. Influence of post-heat treatments on the mechanical properties of CX stainless steel fabricated by selective laser melting. J Mater Sci 55, 8303–8316 (2020). https://doi.org/10.1007/s10853-020-04566-x

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