Formation of Mn-depleted zone in Ti-containing weld metals

Seo, Kangmyung; Kim, Young‐Min; Evans, G. M.; Kim, Hee Jin; Lee, Changhee

doi:10.1007/s40194-014-0207-y

Cited by 31 publications

(23 citation statements)

References 15 publications

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“…The upper size limit for 99 pct of inclusions is marked with a cross for each case. In the literature, several authors [33][34][35][36] described a boost in nucleation potential with the increasing inclusion size, which is in good accordance with earlier findings of Ricks et al [37,38] However, it should be noted that in many cases also, a lower and an upper critical sizes for active inclusions are defined. The lower critical value is the minimum size beneath which particles are too small to act as active nuclei.…”

Section: A Acicular Ferrite Amountsupporting

confidence: 82%

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On the Capability of Nonmetallic Inclusions to Act as Nuclei for Acicular Ferrite in Different Steel Grades

Loder

Michelic

Mayerhofer

et al. 2017

Metall Mater Trans B

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Acicular ferrite nucleates intragranularly on nonmetallic inclusions, forming a microstructure with excellent fracture toughness. The formation of acicular ferrite is strongly affected by the size, content, and composition of nonmetallic inclusions, but also by the composition of the steel matrix. The potential of inclusions in medium carbon HSLA (high-strength low-alloyed) steels has been the main focus in the literature so far. The current study evaluates the acicular ferrite capability of various inclusions types in four different steel grades with carbon contents varying between 0.04 and 0.65 wt pct. The investigated steels are produced by melting experiments on a laboratory scale and subsequent heat treatment in a High-Temperature Laser Scanning Confocal Microscope. Inclusions are exclusively formed by deoxidation and desulfurization reactions. No synthetic particles are added to the melt. The inclusion landscape is analyzed by Scanning Electron Microscopy. Final ductility of the samples is evaluated based on performed tensile tests. Inclusion types in every steel grade are assessed regarding their nucleation potential always considering the interaction with the steel composition, especially focusing on the role of manganese. The effects of (Ti,Al)O x -, MnS-, and MgO-containing inclusions are discussed in detail.

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Section: A Acicular Ferrite Amountsupporting

confidence: 82%

“…This value was determined to be 0.3 to 0.5 lm in various studies. [34,39,40] Ricks et al, [37,38] Lee et al [34] and Mu et al [33][34][35][36] investigated inclusions smaller than 1.5 lm and defined 1 lm as the upper critical value. Above 1 lm, the probability curve flattens out.…”

Section: A Acicular Ferrite Amountmentioning

confidence: 99%

On the Capability of Nonmetallic Inclusions to Act as Nuclei for Acicular Ferrite in Different Steel Grades

Loder

Michelic

Mayerhofer

et al. 2017

Metall Mater Trans B

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“…The critical sizes for inclusions to induce AF well were also obtained from some other previous researches . Mu concluded that the critical inclusion size for TiN had different values under different contents of elements C and Mn in steel.…”

Section: Mechanistic Analysismentioning

confidence: 76%

“…When the Ti content was 0.041% and the nucleation probabilities reached nearly 100%, the Ti‐bearing inclusion size was 0.7 µm. Huang concluded that the possibility of AF nucleation could reach the maximum, when the Ti‐oxide‐bearing inclusion size was around 1.5 µm. The experimental results in present study showed that the inclusions TiN could induce AF well, when the average size was 1.5 µm.…”

Section: Mechanistic Analysismentioning

confidence: 99%

Improvement of Utilization Ratio of Nanoparticles in Steel and Its Influence on Acicular Ferrite Formation

Gao

Yang²,

Li³

et al. 2017

steel research int.

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In the present study, 35MnVS experimental steels containing nanoparticles are manufactured using a vacuum induction furnace (VIF), as well as a vacuum induction levitation furnace (VILF). The differences on the utilization ratio of nanoparticles (URN), inclusion characteristics, and steel microstructure between the original steel and experimental steels are compared. The results reveal that the steel processed with a VILF has a higher URN that helps to form a finer inclusion size range. There is a critical size for each inclusion, and only when the inclusion size is the critical value, the inclusions can efficiently induce acicular ferrites (AF). Among the three steels, only the inclusion size range of the VILF steel is less than the critical size which is between %2.2 and %5.2 m. Therefore, the inclusions in VILF steel have a relatively stronger ability on inducing AF, and that is revealed by its microstructure showing large proportions of AF.

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“…It was found that Mn deple- tion of about 0.8% was made in MDZ area and transformation temperature from austenite to ferrite increased by about 30°C. 9,14) In the present TZB steel, acicular ferrite formed abundantly at about 600°C. When temperature was lower than 570°C, bainite transformation would acquire sufficient chemical driving force and the advantage in thermodynamics for acicular ferrite caused by MDZ became weak.…”

Section: Effect Of Cooling Processmentioning

confidence: 72%

Effect of Hot Deformation and Controlled Cooling Process on Microstructures of Ti–Zr Deoxidized Low Carbon Steel

Wang¹,

Wang²,

Guo-dong³

2016

ISIJ Int.

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Formation of Mn-depleted zone in Ti-containing weld metals

Cited by 31 publications

References 15 publications

On the Capability of Nonmetallic Inclusions to Act as Nuclei for Acicular Ferrite in Different Steel Grades

On the Capability of Nonmetallic Inclusions to Act as Nuclei for Acicular Ferrite in Different Steel Grades

Improvement of Utilization Ratio of Nanoparticles in Steel and Its Influence on Acicular Ferrite Formation

Effect of Hot Deformation and Controlled Cooling Process on Microstructures of Ti–Zr Deoxidized Low Carbon Steel

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