Abnormal tend of ferrite hardening in a medium-Si ferrite-martensite dual phase steel

Khajesarvi, Ali; Banadkouki, Seyyed Sadegh Ghasemi; Sajjadi, Seyed Abdolkarim; Somani, Mahesh C. (2023-03-08)
 
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https://doi.org/10.3390/met13030542

Khajesarvi, Ali
Banadkouki, Seyyed Sadegh Ghasemi
Sajjadi, Seyed Abdolkarim
Somani, Mahesh C.
Multidisciplinary Digital Publishing Institute
08.03.2023

Khajesarvi A, Banadkouki SSG, Sajjadi SA, Somani MC. Abnormal Trend of Ferrite Hardening in a Medium-Si Ferrite-Martensite Dual Phase Steel. Metals. 2023; 13(3):542. https://doi.org/10.3390/met13030542

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© 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
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doi:https://doi.org/10.3390/met13030542
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Abstract

In this paper, the effects of carbon, Si, Cr and Mn partitioning on ferrite hardening were studied in detail using a medium Si low alloy grade of 35CHGSA steel under ferrite-martensite/ferrite-pearlite dual-phase (DP) condition. The experimental results illustrated that an abnormal trend of ferrite hardening had occurred with the progress of ferrite formation. At first, the ferrite microhardness decreased with increasing volume fraction of ferrite, thereby reaching the minimum value for a moderate ferrite formation, and then it surprisingly increased with subsequent increase in ferrite volume fraction. Beside a considerable influence of martensitic phase transformation induced residual compressive stresses within ferrite, these results were further rationalized in respect of the extent of carbon, Si, Cr and Mn partitioning between ferrite and prior austenite (martensite) microphases leading to the solid solution hardening effects of these elements on ferrite.

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