Measurement and Analysis of Time-Temperature-Transformation Curves of Boron Steel 22MnB5

Lian Fang He; Guo Qun Zhao; Hui Ping Li

doi:10.4028/www.scientific.net/AMM.29-32.484

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 29-32Measurement and Analysis of...

Measurement and Analysis of Time-Temperature-Transformation Curves of Boron Steel 22MnB5

Abstract:

Hot stamping of quenchable boron steels is a new and complex forming technology integrating metal hot forming and quenching process. In order to gain the Time – Temperature - Transformation (TTT) curves of 22MnB5, the phase-transformation temperatures of boron steel 22MnB5 are measured by DIL 805A/D quenching and deformation dilatometer. According to the expansion curves of phase-transformation at some constant temperatures, the start and finish temperatures of phase-transformation are calculated by using the expansion method and the tangential method. The types of metallographic phases after phase-transformation are judged by the optical microscope and micro hardness. The TTT curves of 22MnB5 are drawn in terms of the results of testing and calculating.

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Applied Mechanics and Materials (Volumes 29-32)

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484-489

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.29-32.484

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Online since:

August 2010

Authors:

Lian Fang He, Guo Qun Zhao, Hui Ping Li

Keywords:

Hot Stamping, Phase Transformation, TTT Curves

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