Abstract
Creep behavior and microstructure of two 9–10 %Cr–3 %Co martensitic steels with high B and low N was examined. A 10 %Cr steel with low Ni and Mn additives exhibits superior creep resistance and no creep strength breakdown appears at 650 °C. In this steel a dispersion of boundary M23C6 carbides and Laves phase remains nearly unchanged under creep condition and no significant coarsening of lath structure takes place. In contrast, a 9 %Cr steel containing 0.4 wt% Mn and 0.24 %Ni exhibits the creep strength breakdown and relatively low long-term creep strength. In this steel the boundary particles are susceptible to significant coarsening under long-term creep. As a result, the tempered martensite lath structure (TMLS) tends to transform to subgrain structure; significant subgrain growth is observed. No distinct difference in effect of creep and long-term aging on a dispersion of M(C,N) carbonitrides was revealed between two steels.
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Acknowledgments
The study was financially supported by the Russian Science Foundation, under Grant No. 14-29-00173. The authors are grateful to the staff of the Joint Research Center, Belgorod State University, for their assistance with instrumental analysis.
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Kaibyshev, R., Mishnev, R., Tkachev, E. et al. Effect of Ni and Mn on the Creep Behaviour of 9–10 %Cr Steels with Low N and High B. Trans Indian Inst Met 69, 203–210 (2016). https://doi.org/10.1007/s12666-015-0761-z
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DOI: https://doi.org/10.1007/s12666-015-0761-z