Indian Journal of Engineering & Materials Sciences

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Establish time-temperature-transformation diagram based on dilatometry results and microstructural evolutions in an AISI 1010 steel


Affiliations
1 Department of Metallurgical and Materials Engineering, National Institute of Technology, Srinagar 190 006, India
2 Department of Mechanical Engineering, Bundelkhand Institute of Engineering and Technology, Jhansi 284 128, India
3 Institute of Materials Science and Technology, TU Wien, Getreidemarkt 9, 1040 Vienna, Australia

A time-temperature-transformation (TTT) diagram has been constructed using dilation results. The phase transformations have been confirmed through microstructural changes of AISI 1010 steel. The strength of this steel has been improved for various applications using heat treatments. Experiments for a series of steel samples have been conducted between 310- 730°C isothermal temperature range using a thermo-mechanical simulator Gleeble®3800. The austenitised microstructure of the steel has been transformed into a combination of ferrite, pearlite, widmanstätten ferrite, massive ferrite, upper and lower bainite, and martensite, etc., when held at different isothermal temperatures. Ferrite along with pearlite have been observed at higher isothermal temperatures while bainite with martensite have been observed at lower isothermal temperatures. Two C-curves have been observed in pearlite and bainite transformation regions.
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  • Establish time-temperature-transformation diagram based on dilatometry results and microstructural evolutions in an AISI 1010 steel

Abstract Views: 153  | 

Authors

Yashwant Mehta
Department of Metallurgical and Materials Engineering, National Institute of Technology, Srinagar 190 006, India
Sunil Kumar Rajput
Department of Mechanical Engineering, Bundelkhand Institute of Engineering and Technology, Jhansi 284 128, India
Sanjeev Kumar
Institute of Materials Science and Technology, TU Wien, Getreidemarkt 9, 1040 Vienna, Australia

Abstract


A time-temperature-transformation (TTT) diagram has been constructed using dilation results. The phase transformations have been confirmed through microstructural changes of AISI 1010 steel. The strength of this steel has been improved for various applications using heat treatments. Experiments for a series of steel samples have been conducted between 310- 730°C isothermal temperature range using a thermo-mechanical simulator Gleeble®3800. The austenitised microstructure of the steel has been transformed into a combination of ferrite, pearlite, widmanstätten ferrite, massive ferrite, upper and lower bainite, and martensite, etc., when held at different isothermal temperatures. Ferrite along with pearlite have been observed at higher isothermal temperatures while bainite with martensite have been observed at lower isothermal temperatures. Two C-curves have been observed in pearlite and bainite transformation regions.