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Formation mechanism and control methods of acicular ferrite in HSLA steels: A review

Journal Article


Abstract


  • High strength low alloy (HSLA) steels have been widely used in pipelines, power plant components, civil structures and so on, due to their outstanding mechanical properties as high strength and toughness, and excellent weldability. Multi-phase microstructures containing acicular ferrite or acicular ferrite dominated phase have been proved to possess good comprehensive properties in HSLA steels. This paper mainly focuses on the formation mechanisms and control methods of acicular ferrite in HSLA steels. Effect of austenitizing conditions, continuous cooling rate, and isothermal quenching time and temperature on acicular ferrite transformation was reviewed. Furthermore, the modified process to control the formation of multi-phase microstructures containing acicular ferrite, as intercritical heat treatments, step quenching treatments and thermo-mechanical controlled processing, was summarized. The favorable combination of mechanical properties can be achieved by these modified treatments.

Publication Date


  • 2018

Citation


  • Shao, Y., Liu, C., Yan, Z., Li, H., & Liu, Y. (2018). Formation mechanism and control methods of acicular ferrite in HSLA steels: A review. Journal of Materials Science and Technology, 34(5), 737-744. doi:10.1016/j.jmst.2017.11.020

Scopus Eid


  • 2-s2.0-85034577067

Start Page


  • 737

End Page


  • 744

Volume


  • 34

Issue


  • 5

Place Of Publication


Abstract


  • High strength low alloy (HSLA) steels have been widely used in pipelines, power plant components, civil structures and so on, due to their outstanding mechanical properties as high strength and toughness, and excellent weldability. Multi-phase microstructures containing acicular ferrite or acicular ferrite dominated phase have been proved to possess good comprehensive properties in HSLA steels. This paper mainly focuses on the formation mechanisms and control methods of acicular ferrite in HSLA steels. Effect of austenitizing conditions, continuous cooling rate, and isothermal quenching time and temperature on acicular ferrite transformation was reviewed. Furthermore, the modified process to control the formation of multi-phase microstructures containing acicular ferrite, as intercritical heat treatments, step quenching treatments and thermo-mechanical controlled processing, was summarized. The favorable combination of mechanical properties can be achieved by these modified treatments.

Publication Date


  • 2018

Citation


  • Shao, Y., Liu, C., Yan, Z., Li, H., & Liu, Y. (2018). Formation mechanism and control methods of acicular ferrite in HSLA steels: A review. Journal of Materials Science and Technology, 34(5), 737-744. doi:10.1016/j.jmst.2017.11.020

Scopus Eid


  • 2-s2.0-85034577067

Start Page


  • 737

End Page


  • 744

Volume


  • 34

Issue


  • 5

Place Of Publication