Hot Deformation and Acicular Ferrite Microstructure in C-Mn Steel Containing Ti2O3 Inclusions.

Shim, Jaesool; Byun, Jung-Soo; Cho, Young Whan; Oh, Young-Joo; Shim, Jae-Dong; Lee, Dong Nyung

doi:10.2355/isijinternational.40.819

Cited by 22 publications

(15 citation statements)

References 13 publications

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“…18 In addition, such deformation can reduce the austenite grain size via dynamic recrystallisation, increasing the availability of intergranular nucleation sites. 22 However, for the welds investigated here, the amount of plastic deformation induced by rolling is relatively small: a maximum of 13?4% principal plastic strain was observed in the simulations, and no reduction in austenite grain size was observed. Therefore, it is believed that the influence of this deformation in promoting intragranular acicular ferrite nucleation outweighs any detrimental effect on its growth; such an increase in intragranular nucleation would explain the very fine nature of the resulting acicular structure.…”

Section: Influence Of Rolling On Mechanical Properties and Microstrucmentioning

confidence: 90%

High pressure rolling of low carbon steel weld seams: Part 1 – Effects on mechanical properties and microstructure

Coules

Colegrove

Cozzolino

et al. 2013

Science and Technology of Welding and Joining

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One technique for reducing residual stress in welds is high pressure rolling of the weld seam. In this study, a variety of experimental techniques, including microhardness measurements and cross-weld tensile tests with digital image correlation, have been used to characterise the effects of rolling on the mechanical properties and microstructure of the weld material in welded structural steel specimens. It is shown that rolling applied at high temperature, as welding is carried out, promotes the formation of acicular ferrite in the weld metal. This produces a weld material with a greater yield strength and hardness, but slightly reduced impact toughness compared to unrolled welds. Rolling of the weld metal once it has cooled instead causes workhardening. These effects are discussed as they relate to the use of rolling for weld residual stress reduction.

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Section: Influence Of Rolling On Mechanical Properties and Microstrucmentioning

confidence: 90%

High pressure rolling of low carbon steel weld seams: Part 1 – Effects on mechanical properties and microstructure

Coules

Colegrove

Cozzolino

et al. 2013

Science and Technology of Welding and Joining

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show abstract

“…The role of oxide inclusions toward microstructural improvement of wrought steels during thermo‐mechanical processes has been less explored. Shim et al observed that Ti 2 O 3 inclusions can induce ferrite nucleation within the recrystallized austenite grains after hot deformation. Bhadeshia and co‐workers indicated that the transformation to acicular ferrite can be affected by elastic stress and plastic deformation of austenite involving displacive mechanism.…”

Section: Resultsmentioning

confidence: 99%

“…Microstructural refinement by oxide inclusions for wrought steels has been studied using different processing conditions . Results of Hajeri et al indicated that the microstructure of heavy steel sections were refined by Ti‐oxide particles using high holding temperature and slow cooling rate.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Transformation Behaviors of Ti-Zr Killed Low-Carbon Steels with High-Temperature Hot-Rolling Process

Wang

et al. 2016

steel research int.

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The authors describe here the relationship between the microstructure and mechanical properties of Ti-Zr killed low-carbon steels based on hot-rolling experiments and thermo-mechanical simulation. High-temperature hot-rolling and controlled cooling are carried out. Microstructural evolution is studied in quenched steels subjected to hot-rolling simulation. The study suggests that non-metallic inclusions in steel are (Ti, Zr)-rich and are effective in promoting nucleation of acicular ferrite in the recrystallized austenite grains such that the as-rolled microstructure is significantly refined in spite of coarse austenite grain size induced by high-temperature rolling. The addition of boron and accelerated cooling also favored nucleation of acicular ferrite. The tensile strength and low-temperature impact toughness is significantly improved in comparison to the Al-killed steel. The microstructural evolution is divided into two stages including formation of interlocking acicular ferrite structure and coarsening of the ferrite plates with the decomposition of residual austenite.

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“…In addition, the effectiveness of TiO for intragranular nucleation on inclusion is suggested to be due to a small disregistry with appropriately oriented ferrite [8] and that of TiO 2 is suggested to be due to releasing oxygen to decarburize adjacent steel matrix, which is advantageous for ferrite nucleation [9]. In case of Ti 2 O 3 , the development of local manganese depleted zones (MDZs) around particles has been the most influential hypothesis [5,10].…”

Section: Introductionmentioning

confidence: 99%

Inclusions and Microstructure of Steel Weld Deposits with Nanosize Titanium Oxide Addition

Chen

Xue

Peng

et al. 2014

Journal of Nanomaterials

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Nanosize TiO2particles were added directly into welding molten pool through electrode for the difficulty of accurate control of oxygen potential and production processing parameters. The characteristics of phase transformation and thermal behavior of inclusions for Fe-C-Mn-Si-Ti-O system and Fe-C-Mn-Si-TiO2system were analyzed. Results show that the added TiO2particles are more helpful for the formation of Mn-Ti-O complex inclusion and can induce the decrease of phase transformation temperature of austenite to ferrite. Intragranular ferrite can be obtained under the condition of continuous cooling transformation with cooling rate of 293 K/s–373 K/s. The inclusions in steel welds are spherical in shape and mainly composed of TiO2, Ti3O5, Ti2O3, MnO, and SiO2. The mean size of inclusions is 0.67 μm. These complex inclusions can supply a large number of nucleating cores for their precipitation at higher temperature, which will disturb the growth of columnar crystal during solidification. Moreover, Mn-containing titanium oxides will promote the transformation of austenite to intragranular ferrite for the formation of manganese depleted zones in steel welds around oxides. So it can be concluded that nanosize titanium oxide added directly in welding molten pool can be effectively used to control phase transformation and achieve fine and favorable microstructure.

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Hot Deformation and Acicular Ferrite Microstructure in C-Mn Steel Containing Ti2O3 Inclusions.

Cited by 22 publications

References 13 publications

High pressure rolling of low carbon steel weld seams: Part 1 – Effects on mechanical properties and microstructure

High pressure rolling of low carbon steel weld seams: Part 1 – Effects on mechanical properties and microstructure

Mechanical Properties and Transformation Behaviors of Ti-Zr Killed Low-Carbon Steels with High-Temperature Hot-Rolling Process

Inclusions and Microstructure of Steel Weld Deposits with Nanosize Titanium Oxide Addition

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