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Effects of cooling rates on ��-ferrite/��-austenite formation and martensitic transformation in modified ferritic heat resistant steel

Journal Article


Abstract


  • Aimed at clarifying ��-ferrite formation in fusion welding of ferritic/martensitic steels, effects of cooling rates on ��/�� transformation and martensitic transformation in modified ferritic heat resistant steel are investigated by high-speed quenching dilatometer equipment and microstructure examination. In heating stage, ��-austenite starts to transform into ��-ferrite at 1250 �� 20 ��C. With respect to cooling stage, at cooling rate of 1 ��C/s, �� ��� �� transformation takes place at temperatures above 1250 ��C. Stripe-shaped ��-ferrite is produced at 1 ��C/s, and under higher cooling rates (30, 50 and 200 ��C/s), ��-ferrite exhibits block morphology. The different levels to which the �� ��� �� transformation proceeds would result in the variation in austenite grain size and the amount of ��-ferrite, affecting the subsequent martensitic formation. Effects of cooling rates on martensite start temperature have been discussed in terms of austenite grain size and austenite chemical stability.

Publication Date


  • 2017

Citation


  • Zhou, X., Liu, Y., Qiao, Z., Guo, Q., Liu, C., Yu, L., & Li, H. (2017). Effects of cooling rates on ��-ferrite/��-austenite formation and martensitic transformation in modified ferritic heat resistant steel. Fusion Engineering and Design, 125, 354-360. doi:10.1016/j.fusengdes.2017.05.095

Scopus Eid


  • 2-s2.0-85019699860

Start Page


  • 354

End Page


  • 360

Volume


  • 125

Issue


Place Of Publication


Abstract


  • Aimed at clarifying ��-ferrite formation in fusion welding of ferritic/martensitic steels, effects of cooling rates on ��/�� transformation and martensitic transformation in modified ferritic heat resistant steel are investigated by high-speed quenching dilatometer equipment and microstructure examination. In heating stage, ��-austenite starts to transform into ��-ferrite at 1250 �� 20 ��C. With respect to cooling stage, at cooling rate of 1 ��C/s, �� ��� �� transformation takes place at temperatures above 1250 ��C. Stripe-shaped ��-ferrite is produced at 1 ��C/s, and under higher cooling rates (30, 50 and 200 ��C/s), ��-ferrite exhibits block morphology. The different levels to which the �� ��� �� transformation proceeds would result in the variation in austenite grain size and the amount of ��-ferrite, affecting the subsequent martensitic formation. Effects of cooling rates on martensite start temperature have been discussed in terms of austenite grain size and austenite chemical stability.

Publication Date


  • 2017

Citation


  • Zhou, X., Liu, Y., Qiao, Z., Guo, Q., Liu, C., Yu, L., & Li, H. (2017). Effects of cooling rates on ��-ferrite/��-austenite formation and martensitic transformation in modified ferritic heat resistant steel. Fusion Engineering and Design, 125, 354-360. doi:10.1016/j.fusengdes.2017.05.095

Scopus Eid


  • 2-s2.0-85019699860

Start Page


  • 354

End Page


  • 360

Volume


  • 125

Issue


Place Of Publication