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Effects of Hf addition on the thermal stability of 16Cr-ODS steels at elevated aging temperatures

Journal Article


Abstract


  • In this paper, the effects of hafnium (Hf) addition on the thermal stability of the microstructure and tensile properties of Al-containing 16Cr-ODS steels were investigated. High temperature aging tests of the ODS steels with and without Hf were conducted at 750 ��C, 950 ��C and 1150 ��C for 100 h respectively. And the microstructure evolution after thermal aging was investigated using transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD). The results indicated that Hf addition could improve the coarsening resistance of the oxide particles and the grains during aging treatment due to the formation of stable Y2Hf2O7 particles. Tensile tests on the aged-steels showed that the ultimate tensile strength and yield strength of 16Cr-Hf-ODS steel were higher than those of 16Cr-ODS steel. It was considered that the excellent thermal stability and tensile properties of 16Cr-Hf-ODS steel were related with the refined microstructure.

Publication Date


  • 2018

Citation


  • Yan, P., Yu, L., Liu, Y., Liu, C., Li, H., & Wu, J. (2018). Effects of Hf addition on the thermal stability of 16Cr-ODS steels at elevated aging temperatures. Journal of Alloys and Compounds, 739, 368-379. doi:10.1016/j.jallcom.2017.12.245

Scopus Eid


  • 2-s2.0-85039694821

Start Page


  • 368

End Page


  • 379

Volume


  • 739

Issue


Place Of Publication


Abstract


  • In this paper, the effects of hafnium (Hf) addition on the thermal stability of the microstructure and tensile properties of Al-containing 16Cr-ODS steels were investigated. High temperature aging tests of the ODS steels with and without Hf were conducted at 750 ��C, 950 ��C and 1150 ��C for 100 h respectively. And the microstructure evolution after thermal aging was investigated using transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD). The results indicated that Hf addition could improve the coarsening resistance of the oxide particles and the grains during aging treatment due to the formation of stable Y2Hf2O7 particles. Tensile tests on the aged-steels showed that the ultimate tensile strength and yield strength of 16Cr-Hf-ODS steel were higher than those of 16Cr-ODS steel. It was considered that the excellent thermal stability and tensile properties of 16Cr-Hf-ODS steel were related with the refined microstructure.

Publication Date


  • 2018

Citation


  • Yan, P., Yu, L., Liu, Y., Liu, C., Li, H., & Wu, J. (2018). Effects of Hf addition on the thermal stability of 16Cr-ODS steels at elevated aging temperatures. Journal of Alloys and Compounds, 739, 368-379. doi:10.1016/j.jallcom.2017.12.245

Scopus Eid


  • 2-s2.0-85039694821

Start Page


  • 368

End Page


  • 379

Volume


  • 739

Issue


Place Of Publication