Effects of Titanium Addition on Precipitate and Microstructural Control in C-Mn Microalloyed Steels.

Vedani, Maurizio; Mannucci, A.

doi:10.2355/isijinternational.42.1520

Cited by 14 publications

(10 citation statements)

References 15 publications

(29 reference statements)

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“…In order to achieve this, Ti was added at hyperstoichiometric level, which in addition to consumption of nitrogen, improved austenite hardenability in synergy with B. [3,4] Further improvement in austenite hardenability was achieved by addition of Cu, which is known to retard the c fi a transformation at the intercritical temperature range. [5][6][7] In the present study, Ni addition not only contributed to improving the austenite hardenability, but also played its established role in suppressing the hot shortness effect arising due to presence of Cu in steel.…”

Section: Discussionmentioning

confidence: 99%

“…[2] Microalloying with elements such as Ti and B also improve the hardenability of austenite. [3,4] It is also known that addition of Cu retards the austenite (c) fi ferrite (a) transformation. [5][6][7] In the present study, the necessary hardenability of austenite is achieved by microalloying (Ti, B) and Cu addition (1.5 wt pct) without using the partitioning effect during intercritical annealing with an aim to develop directly air-cooled low-carbon (0.035 to 0.055 wt pct) steels.…”

Section: Introductionmentioning

confidence: 99%

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Development of High-Strength Cu-Ni-Ti-B Multiphase Steel by Direct Air Cooling

Ghosh

Haldar

Ganguly

et al. 2008

Metall Mater Trans A

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The present study concerns development of high-strength low-carbon Cu-Ni-Ti-B multiphase steels in the as-hot-rolled condition. An attempt has been made to predict the microstructural evolution of the chosen steels during continuous cooling transformation by artificial neural network modeling as well as dilatometric study. Experimental results have demonstrated that direct air cooling of the hot-rolled Cu-Ni-Ti-B steel resulted in a microstructure containing intercritical ferrite and finer low-temperature transformation products of austenite. An attractive strength-ductility combination was achieved in the case of as-hot-rolled Cu-Ni-Ti-B steel with a dual-phase-like microstructure. Age hardening of the steels has further enhanced the mechanical properties. Analysis of the work-hardening behavior by differential Jaoult-Crussard (J-C) analysis has revealed the effect of aging on the work-hardening behavior.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of High-Strength Cu-Ni-Ti-B Multiphase Steel by Direct Air Cooling

Ghosh

Haldar

Ganguly

et al. 2008

Metall Mater Trans A

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“…When transverse and edge cracking during continuous casting is the main issue, the Ti/N ratio should be kept on the hyperstoichiometric Faculty of Engineering, University of Wollongong, Wollongong, NSW 2500, Australia *Corresponding author, email alidm@uow.edu.au side and in a range of 5-10, depending on the steel composition. 8,9 Hot rolling, followed by cold rolling in selected cases, of as cast slabs is the most common industrial approach to produce plate and sheet products. It is fundamentally important to determine the mechanisms by which microstructural changes occur in the course of hot rolling because it is this microstructural development that determines the physical and mechanical properties of the final product.…”

Section: And Kejian and Bakermentioning

confidence: 99%

Hot deformation and recrystallisation of low Mn steels with different Ti/N ratio

Dehghan-Manshadi

Dippenaar

2011

Ironmaking & Steelmaking

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The effects of small titanium and nitrogen additions on the mechanical properties and microstructural characteristics of four different low carbon, low manganese steels have been studied using a Gleeble thermomechanical simulator and TEM investigations. The Ti/N ratio in these steels as well as the size and distribution of TiN particles play a major role in determining the mechanical properties, the resulting austenite grain size as well as the size of inclusion precipitates. The best mechanical properties were obtained in the steel with a Ti/N ratio lower than the stoichiometric value. This steel also had the smallest austenite grain size after reheating as well as the highest rate of dynamic recrystallisation during hot deformation. The nature and rate of recrystallisation seem to be determined by an intricate interplay between the size and distribution of titanium nitrides and the prevailing austenite grain size.

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“…In low-alloy steel, Ti combines carbon (C) and/or nitrogen (N) to form stable compounds, such as TiN, TiC, or Ti(C,N). These compounds precipitating on the grain boundary, prevent the growth rate of austenite grains during the process of heating and rolling, and restrain austenite recovery and recrystallization [1][2][3]. They improve the intensity and toughness of steels, as well as guarantee its machinability and weldability.…”

Section: Introductionmentioning

confidence: 97%

Dissolution of Al2TiO5 inclusions in CaO-SiO2-Al2O3 slags at 1823 K

Wang

Liu

Jiang

et al. 2011

Int J Miner Metall Mater

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Al-Ti-O inclusions always clog submerged nozzles in Ti-bearing Al-killed steel. A typical synthesized Al 2 TiO 5 inclusion was immersed in a CaO-SiO 2 -Al 2 O 3 molten slag for different durations at 1823 K. The Al 2 TiO 5 dissolution paths and mechanism were revealed by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Decreased amounts of Ti and Al and increased amounts of Si and Ca at the dissolution boundary prove that inclusion dissolution and slag penetration simultaneously occur. SiO 2 diffuses or penetrates the inclusion more quickly than CaO, as indicated by the w(CaO)/w(SiO 2 ) value in the reaction region. A liquid product (containing 0.7-1.2 w(CaO)/w(SiO 2 ), 15wt%-20wt% Al 2 O 3 , and 5wt%-15wt% TiO 2 ) forms on the inclusion surface when Al 2 TiO 5 is dissolved in the slag. Al 2 TiO 5 initially dissolves faster than the diffusion rate of the liquid product toward the bulk slag. With increasing reaction time, the boundary reaches its largest distance, the Al 2 TiO 5 dissolution rate equals the liquid product diffusion rate, and the dissolution process remains stable until the inclusion is completely dissolved.

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Effects of Titanium Addition on Precipitate and Microstructural Control in C-Mn Microalloyed Steels.

Cited by 14 publications

References 15 publications

Development of High-Strength Cu-Ni-Ti-B Multiphase Steel by Direct Air Cooling

Development of High-Strength Cu-Ni-Ti-B Multiphase Steel by Direct Air Cooling

Hot deformation and recrystallisation of low Mn steels with different Ti/N ratio

Dissolution of Al2TiO5 inclusions in CaO-SiO2-Al2O3 slags at 1823 K

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