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Effect of N on the Microstructure and Mechanical Properties of High Si Martensitic Heat-Resistant Steels

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

In order to investigate the effect of N on the microstructure and room temperature mechanical properties of new-type high silicon martensitic heat-resistant steels, three steels containing the same total content of C and N but different N contents have been designed and prepared according to the thermo-calc calculation. The thermodynamic calculation and experiments indicate that the replacing of C by N changes the kind and volume fraction of precipitates of the high Si martensitic steel significantly. Along with the N content increasing, the precipitates in the samples after 750 °C tempering change from (Cr23C6 + VN + TaC) to (Cr23C6 + VN + TaC + TaN) and finally to (Cr23C6 + VN + Cr2N) according to both experimental results and thermodynamic calculations. The room temperature mechanical tests show that the strength of the steel decreases as the N content increases. However, the Charpy impact toughness increases with N content increasing. According to the calculation and SEM observation, it is inferred that the decrease of amount and size of precipitates accounts for the changes of the mechanical properties.

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Acknowledgments

This work was financially supported by the Strategic Priority Research Program CAS (No. XDA03010304), the National Natural Science Foundation of China (No. 91226204), and the Youth Innovation Promotion Association CAS. The authors also gratefully acknowledge Dr. J.M. Liu and S.H. Zhang in Institute of Metal Research CAS for the TEM experiments.

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Authors and Affiliations

  1. Shenyang Ligong University, Shenyang, 110159, China

    Jia Sun & Yutuo Zhang

  2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Science, Shenyang, 110016, China

    Jia Sun, Yutuo Zhang, Pei Wang, Zhongfei Ye & Dianzhong Li

Authors
  1. Jia Sun
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  2. Yutuo Zhang
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  3. Pei Wang
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  4. Zhongfei Ye
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  5. Dianzhong Li
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Corresponding authors

Correspondence to Yutuo Zhang or Pei Wang.

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Available online at http://link.springer.com/journal/40195

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Sun, J., Zhang, Y., Wang, P. et al. Effect of N on the Microstructure and Mechanical Properties of High Si Martensitic Heat-Resistant Steels. Acta Metall. Sin. (Engl. Lett.) 27, 573–584 (2014). https://doi.org/10.1007/s40195-014-0095-6

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  • DOI: https://doi.org/10.1007/s40195-014-0095-6

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