Hardening of low-carbon, high-strength steel by deformation in the intercritical temperature range

1999 ◽  
Vol 41 (5) ◽  
pp. 202-206
Author(s):  
I. Yu. Pyshmintsev ◽  
V. A. Korznikov ◽  
R. Z. Valiev ◽  
V. A. Khotinov
Keyword(s):  
High Strength Steel ◽  
High Strength ◽  
Low Carbon ◽  
Intercritical Temperature Range ◽  
Intercritical Temperature ◽  
Temperature Range

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

2020 ◽  
Vol 26 (3) ◽  
pp. 116-121
Author(s):  
Vasily Efremenko ◽  
Roman Kussa ◽  
Ivan PETRYSHYNETS ◽  
Kazumichi SHIMIZU ◽  
František KROMKA ◽  
...  
Keyword(s):  
Distribution Coefficient ◽  
Annealing Temperature ◽  
Volume Fraction ◽  
Manganese Content ◽  
Low Carbon ◽  
Intercritical Temperature Range ◽  
Intercritical Temperature ◽  
Temperature Range ◽  
Element Partitioning ◽  
Kinetics Of

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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