Effect of Mg Addition on the Characterization of γ-α Phase Transformation During Continuous Cooling in Low Carbon Steel

Li, Xiaobing; Min, Yi; Liu, Chengjun; Jiang, Maofa

doi:10.1002/srin.201400517

Cited by 20 publications

(30 citation statements)

References 47 publications

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“…The previous research has discussed the influence of Mg on the phase transformation and mechanical properties. [33] In this study, Zr and Mg were both added into the Al deoxidized low carbon steel. The function of the produced inclusions on the formation of IAF was investigated in conjunction with determining the preferential cooling rates of the IAF formation and measuring the mechanical properties of hot-rolled samples.…”

Section: Introductionmentioning

confidence: 99%

Study on the Formation of Intragranular Acicular Ferrite in a Zr–Mg–Al Deoxidized Low Carbon Steel

Min

Liu

et al. 2015

steel research int.

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The formation of intragranular acicular ferrite (IAF) in a Zr–Mg–Al deoxidized low carbon steel was investigated by means of dilatometry, thermo‐mechanical controlled processing, and combined these results with metallographical observations. The typical inclusions were characterized by scanning electron microscopy and the chemical composition of the inclusions was determined by energy dispersive spectroscopy. The role of these inclusions on the formation of IAF was discussed. The results indicate that the Al2O3–MgO–ZrO2 and Al2O3–MgO–ZrO2–MnS multiphase particles with 1.5–3.0 μm size can be the effective nuclei of IAF, whereas the Al2O3–MnS inclusions are inert. A Mn–depletion zone is observed adjacent to the Al2O3–MgO–ZrO2–MnS inclusion, which is believed to be one of the possible mechanisms to promote the IAF formation. Through dilatometric tests, for Zr–Mg steel, the IAF structure forms in the cooling rate range of 1–10 °C s−1, and the most appropriate cooling rate for IAF is in the range of 5–10 °C s−1. A fine grained microstructure and an improvement of toughness and tensile properties are obtained after subjecting the steel grade with Zr and Mg additions to a special thermo‐mechanical regime.

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Section: Introductionmentioning

confidence: 99%

Study on the Formation of Intragranular Acicular Ferrite in a Zr–Mg–Al Deoxidized Low Carbon Steel

Min

Liu

et al. 2015

steel research int.

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“…In this way, Mg enlarges the supercooled austenite region and promotes bainite transformation. AF is considered to go through the same transformation mechanism to bainite, except that AF nucleates intragranularly on inclusions . The bainite content increased because of the lack of effective nucleus for AF nucleation in the sample Mg3.…”

Section: Resultsmentioning

confidence: 99%

Effect of Mg on the Evolution of Inclusions and Formation of Acicular Ferrite in La–Ti‐Treated Steels

Cui

Song

Yang

et al. 2020

steel research int.

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The size distribution and compositions of inclusions and microstructures in steels with different Mg contents are systematically investigated. The results show that Mg treatment modified and refined the inclusions. With Mg addition, the dominant inclusions in the samples evolve from LaAlO3 with MnS to a Mg‐enriched core enwrapped by a La‐enriched shell with MnS. While the Mg content increases from 11 to 66 ppm, the core changes from MgO·Al2O3 to MgO, and the shell develops from LaAlO3 to La2O2S. With the increase in Mg content from 0 to 44 ppm, the number density of effective inclusions is improved, and the proportion of acicular ferrite (AF) increases from 15% to 39%. However, the AF fraction decreases to 16% due to the relatively low amount of effective inclusions in the sample Mg3 with 66 ppm Mg.

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“…The detailed description of the process is given in our previous studies. 12,13 The mechanical properties are as follows: yield strength 448 MPa (S1), 468 MPa (S2); tensile strength 545 MPa (S1), 566 MPa (S2); average transversal impact toughness (-40uC) 120 J (S1), 192 J (S2), which was reported in the previous paper. 11 Weld simulation was performed on a thermomechanical simulator to investigate impact toughness and microstructural evolution changes in CGHAZ among the two steels.…”

Section: Methodsmentioning

confidence: 95%

Effect of Zr addition on toughness and microstructure of coarse grained heat affected zone in Al deoxidised low carbon steel

Min

Liu

et al. 2016

Materials Science and Technology

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The effect of Zr addition on the toughness and microstructure of coarse grained heat affected zone (CGHAZ) in Al deoxidised low carbon steel was investigated. In this present work, the specimens (Zr free and Zr added) were subjected to weld thermal cycle with heat input of 54, 80 and 100 kJ cm 21 at 13508C peak temperature using thermal simulator. The typical inclusions were characterised by scanning electron microscopy, and the chemical composition of the inclusions was determined by energy dispersive spectroscopy. The nanoscale precipitates were analysed by transmission electron microscopy and energy dispersive spectroscopy. It was verified that the occurrence of Zr in steel mostly exists in the form of oxide inclusions, but a few in the form of solid solution state and Zr containing precipitates when the concentration of Zr is 0.015%. The improvement of CGHAZ toughness is obtained when the heat input is 80-100 kJ cm 21 . The possible reasons about the effects of Zr on the toughness of CGHAZ, including Zr containing inclusions, precipitates and microstructure characteristics, were also discussed.

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Effect of Mg Addition on the Characterization of γ-α Phase Transformation During Continuous Cooling in Low Carbon Steel

Cited by 20 publications

References 47 publications

Study on the Formation of Intragranular Acicular Ferrite in a Zr–Mg–Al Deoxidized Low Carbon Steel

Study on the Formation of Intragranular Acicular Ferrite in a Zr–Mg–Al Deoxidized Low Carbon Steel

Effect of Mg on the Evolution of Inclusions and Formation of Acicular Ferrite in La–Ti‐Treated Steels

Effect of Zr addition on toughness and microstructure of coarse grained heat affected zone in Al deoxidised low carbon steel

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