Phase Transformation under Continuous Cooling Conditions in Medium Carbon Microalloyed Steels

doi:10.1016/j.jmst.2014.03.015

J. Mater. Sci. Technol.

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Phase Transformation under Continuous Cooling Conditions in Medium Carbon Microalloyed Steels

Manuel Gomez, Lucía Rancel, Esther Escudero, Sebastian F. Medina

National Centre for Metallurgical Research, CENIM-CSIC, Av. Gregorio del Amo 8, 28040 Madrid, Spain

Received:2013-09-18 Revised:2013-12-09 Online:2014-05-15 Published:2014-05-15
Contact: M. Gomez
Supported by:
The authors gratefully acknowledge the financial support of Spanish Ministry of Economy and Competitiveness through the project ref. MAT2011-29039-C02-02.

Abstract

Abstract:

Several 35CrMo4 and 38MnV7 steels with different additions of Ti and V were manufactured by electroslag remelting. The influence of the alloying and microalloying elements on phase transformation at different cooling rates was studied and the continuous cooling transformation diagrams were plotted. In order to optimize the heat treatment and improve the mechanical properties, the range of cooling rates leading to a fully bainitic microstructure (without ferrite, pearlite and especially without martensite) was determined. Bainite and martensite transformation start temperatures (B_s, M_s) were also established and compared with the values predicted by empirical equations. The important role of precipitates (especially V carbonitride particles) on final microstructure and mechanical properties was assessed.

Manuel Gomez, Lucía Rancel, Esther Escudero, Sebastian F. Medina. Phase Transformation under Continuous Cooling Conditions in Medium Carbon Microalloyed Steels[J]. J. Mater. Sci. Technol., DOI: 10.1016/j.jmst.2014.03.015.

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Phase Transformation under Continuous Cooling Conditions in Medium Carbon Microalloyed Steels

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