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Microstructure Evolution of High Cr Ferritic Heat-Resistant Steel in High Temperature Thermal Cycle

Journal Article


Abstract


  • To explore the microstructure evolution of high Cr ferritic heat-resistant steel in high temperature thermal cycle, high temperature thermal cycle test was carried out. By using optical microscopy and transmission electron microscopy(TEM), the evolution of matrix and precipitate of high Cr ferritic heat-resistant steel in single high temperature thermal cycle test and double high temperature thermal cycle test was systematically studied, which provides the experimental basis for the study of initiation micro mechanism of the fourth welding crack. The results show that during high temperature thermal cycle test, the fraction of the austenite phase increases first and then decreases with the increase of thermal cycle temperature, reaching the maximum at the peak temperature 1 100℃.The M23C6 carbonitrides all resolve at the peak temperature 1 100℃, while the MX carbonitrides all resolve at the peak temperature 1 300℃, and their sizes in different high temperature thermal cycle tests have remained unchanged.The widths of martensite increase with the increase of thermal cycle temperature.The dissolution of precipitate and the formation of δ-ferrite have an important effect on the hardness.

Publication Date


  • 2018

Citation


  • Li, H., Yan, B., Liu, C., Liu, Y., & Chen, J. (2018). Microstructure Evolution of High Cr Ferritic Heat-Resistant Steel in High Temperature Thermal Cycle. Tianjin Daxue Xuebao (Ziran Kexue yu Gongcheng Jishu Ban)/Journal of Tianjin University Science and Technology, 51(7), 729-734. doi:10.11784/tdxbz201706066

Scopus Eid


  • 2-s2.0-85056285584

Web Of Science Accession Number


Start Page


  • 729

End Page


  • 734

Volume


  • 51

Issue


  • 7

Abstract


  • To explore the microstructure evolution of high Cr ferritic heat-resistant steel in high temperature thermal cycle, high temperature thermal cycle test was carried out. By using optical microscopy and transmission electron microscopy(TEM), the evolution of matrix and precipitate of high Cr ferritic heat-resistant steel in single high temperature thermal cycle test and double high temperature thermal cycle test was systematically studied, which provides the experimental basis for the study of initiation micro mechanism of the fourth welding crack. The results show that during high temperature thermal cycle test, the fraction of the austenite phase increases first and then decreases with the increase of thermal cycle temperature, reaching the maximum at the peak temperature 1 100℃.The M23C6 carbonitrides all resolve at the peak temperature 1 100℃, while the MX carbonitrides all resolve at the peak temperature 1 300℃, and their sizes in different high temperature thermal cycle tests have remained unchanged.The widths of martensite increase with the increase of thermal cycle temperature.The dissolution of precipitate and the formation of δ-ferrite have an important effect on the hardness.

Publication Date


  • 2018

Citation


  • Li, H., Yan, B., Liu, C., Liu, Y., & Chen, J. (2018). Microstructure Evolution of High Cr Ferritic Heat-Resistant Steel in High Temperature Thermal Cycle. Tianjin Daxue Xuebao (Ziran Kexue yu Gongcheng Jishu Ban)/Journal of Tianjin University Science and Technology, 51(7), 729-734. doi:10.11784/tdxbz201706066

Scopus Eid


  • 2-s2.0-85056285584

Web Of Science Accession Number


Start Page


  • 729

End Page


  • 734

Volume


  • 51

Issue


  • 7