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A Systematic Investigation of Precipitates in Matrix and at Grain Boundaries in an Alumina-Forming Austenitic Steel During Creep Testing at 700 °C

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Abstract

A systematic investigation of the microstructure in an alumina-forming austenitic (AFA) stainless steel at different time (0 to 2821 hours) reveals the diverse evolution of precipitates both at grain boundaries (GBs) and in matrix. In the initial stage at 700 °C, the second-phase precipitates in the AFA steel occurred in the sequence of M23C6 carbide at GB (0.5 hour), B2-NiAl phase at GB (1 hour), MC carbide in matrix (5 hours), and L12-Ni3Al in matrix (10 hours). During creep test, the coarsening of L12-precipitates in the matrix followed Oswald ripening law, i.e., the size was proportional to t1/3 (t as the creep time). However, the width of precipitation free zone near GB was proportional to t1/2 and B2 phase at GB increased linearly with time. Meanwhile, the M23C6 carbides, which mainly precipitated at GB, kept at nanoscale within 500 hours and grew ultimately to micrometer size. Consequently, the strength of GBs weakened faster than the grain interior and became similar to the strength of the grain interior after the equicohesive time tE. The creep rupture mode correspondingly changed from transgranular to intergranular after long-term creep rupture. Hence, both strengthening and weakening by precipitation ought to be considered for creep life prediction.

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Acknowledgements

Financial supports from the National Key Research and Development Program of China [Grant No. 2016YFB0701405], the National Natural Science Foundation of China [Grant No. 51501114], and the Science and Technology Committee of Shanghai Municipality [Grant Nos. 15YF1406600 and 16DZ2260602] are gratefully acknowledged.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai, 200240, P.R. China

    Hongyuan Wen, Bingbing Zhao, Xianping Dong, Feng Sun & Lanting Zhang

  2. Materials Genome Initiative Center, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai, 200240, P.R. China

    Bingbing Zhao, Xianping Dong, Feng Sun & Lanting Zhang

  3. Shanghai Key Laboratory of High Temperature Materials and Precision Forming, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai, 200240, P.R. China

    Bingbing Zhao, Xianping Dong, Feng Sun & Lanting Zhang

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  1. Hongyuan Wen
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  2. Bingbing Zhao
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  4. Feng Sun
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  5. Lanting Zhang
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Correspondence to Bingbing Zhao or Lanting Zhang.

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Manuscript submitted January 23, 2020.

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Wen, H., Zhao, B., Dong, X. et al. A Systematic Investigation of Precipitates in Matrix and at Grain Boundaries in an Alumina-Forming Austenitic Steel During Creep Testing at 700 °C. Metall Mater Trans A 51, 4186–4194 (2020). https://doi.org/10.1007/s11661-020-05848-4

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  • DOI: https://doi.org/10.1007/s11661-020-05848-4

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