Formation of Medium Carbon TRIP Steel Microstructure During Annealing in the Intercritical Temperature Range

Abstract The paper presents the results of research conducted on austenite formation in the microstructure of 41MnSi6-5 TRIP steel during annealing in the intercritical temperature range. The influence of the annealing temperature on the volume fraction of retained austenite in the microstructure of the investigated steel after water quenching was also determined.Based on the results of a dilatometric analysis and metallographic investigation it was noted that the pearlite-to-austenite transformation does not occur at a constant temperature, which is referred to as Ac1, but rather within some, possible to determine, temperature range which is bounded by the values Ac1s and Ac1f.Moreover, through X-ray analysis, it was stated that the largest amount of retained austenite remained in the samples which were annealed at the lowest temperatures in the Ac1s-Ac1f range prior to quenching. Increasing the annealing temperature to a two-phase a+g (ferrite + austenite) range, resulted in a decrease of the volume fraction of retained austenite.It was also found that during annealing in Ac1s÷Ac1f temperature range, austenite is also formed from ferrite simultaneously. This could be the reason for the decrease the carbon content in the formed austenite and consequently the decrease in the volume fraction of retained austenite in the microstructure of the investigated steel, which was quenched after having reached temperatures higher than Ac1s + 30°C.

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

Acta Metallurgica Slovaca ◽

10.36547/ams.26.3.554 ◽

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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Features of austenite formation in low-carbon steel upon heating in the intercritical temperature range

The Physics of Metals and Metallography ◽

10.1134/s0031918x17110102 ◽

2017 ◽

Vol 118 (11) ◽

pp. 1081-1090 ◽

Cited By ~ 1

Author(s):

D. O. Panov ◽

A. I. Smirnov

Keyword(s):

Carbon Steel ◽

Low Carbon Steel ◽

Austenite Formation ◽

Low Carbon ◽

Intercritical Temperature Range ◽

Intercritical Temperature ◽

Temperature Range

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Effect of Annealing Temperature on Austenite Stability of a δ-TRIP Steel

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.818.82 ◽

2019 ◽

Vol 818 ◽

pp. 82-86

Author(s):

Xin Xu ◽

Ren Dong Liu ◽

Bao Yu Xu ◽

Hong Liang Yi ◽

Guo Dong Wang

Keyword(s):

Mechanical Properties ◽

Trip Steel ◽

Retained Austenite ◽

Annealing Temperature ◽

Volume Fraction ◽

X Ray Diffraction ◽

X Ray ◽

Austenite Stability ◽

Poor Stability ◽

Better Than

In this work, a novel type of δ-TRIP steel was designed, and the content and stability of retained austenite in δ-TRIP specimens under different annealing processes were detected and studied, respectively. The volume fraction of austenite was determined by X-ray diffraction (XRD). The microstructure and mechanical properties were analyzed systematically. The results show that a complex microstructure composed of three phases (ferrite, bainite and retained austenite) was obtained in the δ-TRIP steel. With the increasing of annealing temperature, both retained austenite and bainite content in the specimen increased, while the carbon content in retained austenite decreased, leading to a poor stability for retained austenite. Both tensile and yield strength improved with the increasing of annealing temperature, while the elongation reduced. The feature of retained austenite led to an excellent combination of ductility and strength, which was better than traditional TRIP steel.

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