Element partitioning in low-carbon Si2Mn2CrMoVNb TRIP-assisted steel in intercritical temperature range

Authors

  • Vasily Efremenko Pryazovskyi State Technical University
  • Roman Kussa Pryazovskyi State Technical University
  • Ivan PETRYSHYNETS Institute of Materials Research, Slovak Academy of Sciences
  • Kazumichi SHIMIZU Muroran Institute of Technology
  • František KROMKA Institute of Materials Research, Slovak Academy of Sciences
  • Vadym ZURNADZHY Pryazovskyi State Technical University
  • Victoria GAVRILOVA Pryazovskyi State Technical University

DOI:

https://doi.org/10.36547/ams.26.3.554

Abstract

The present paper is aimed at the study of the kinetics of Mn, Si, Cr partitioning in 0.2wt%C-Si2Mn2CrMoVNb TRIP-assisted steel under the annealing at 770 oC and 830 oC to be within the intercritical temperature range. The work was fulfilled using SEM, EDX, dilatometry, and hardness measurements. It was found that under heating a redistribution of the alloying elements between ferrite and austenite took place. Specifically, silicon partitioned to ferrite while chromium diffused to austenite with distribution coefficient values of 1.12-1.21 (KSi) and 0.75-0.86 (KCr). Manganese was found to partition to a much greater extent resulting in a distribution coefficient of KMn=0.38-0.50 and 2.6 times higher concentration in austenite as compared to ferrite. As annealing temperature raised from 770 oC to 830 oC the elemental partitioning was accelerated, followed by the decrease in manganese content in austenite (by 1.44 time) and ferrite (by 1.34 time) caused by an increase in austenite volume fraction. Silicon featured uneven distribution within ferrite to be accumulated at the “martensite/ferrite” interface and near ferrite grain boundaries, while manganese was concentrated in MC carbides. The recommendation for annealing holding was formulated based on elemental partitioning kinetics. 

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Published

2020-09-03

How to Cite

Efremenko, V., Kussa, R., PETRYSHYNETS, I. ., SHIMIZU, K. ., KROMKA, F. ., ZURNADZHY, V. ., & GAVRILOVA, V. . (2020). Element partitioning in low-carbon Si2Mn2CrMoVNb TRIP-assisted steel in intercritical temperature range. Acta Metallurgica Slovaca, 26(3), 116-121. https://doi.org/10.36547/ams.26.3.554

Issue

Section

Research papers
Received 2020-05-14
Accepted 2020-08-14
Published 2020-09-03

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