Enhancement of Heat-Affected Zone Toughness of a Low Carbon Steel by TiN Particle

Zhang, Yu; Li, Xiaobao; Ma, Han

doi:10.1007/s11663-015-0534-4

Cited by 22 publications

(14 citation statements)

References 15 publications

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“…The austenite grains with the small sizes provided adequate triple junctions as the preferential nucleating sites for γ → α phase transformation [24,32]. Furthermore, the relatively slow cooling rate during the phase transformation process was beneficial to the formation of PFs [33]. Therefore, the fine PF microstructure instead of brittle microstructures were formed in the HAZ of HM, as shown in Figure 2d and 13c.…”

Section: Role Of Mg Deoxidation On Improving Haz Toughnessmentioning

confidence: 97%

Mechanism of Improving Heat-Affected Zone Toughness of Steel Plate with Mg Deoxidation after High-Heat-Input Welding

Yang

Park

et al. 2020

Metals

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In the present study, the mechanism of improving HAZ toughness of steel plate with Mg deoxidation after the simulated welding with the heat input of 400 kJ/cm was investigated through in situ observation, characterization with SEM-EDS and TEM-EDS, and thermodynamic calculation. It was found that intragranular acicular ferrite (IAF) and polygonal ferrite (PF) contributed to the improvements of HAZ toughness in steels with Mg deoxidation. With the increase of Mg content in steel, the oxide in micron size inclusion was firstly changed to MgO-Ti2O3, then to MgO with the further increase of Mg content in steel. The formation of nanoscale TiN particles was promoted more obviously with the higher Mg content in the steel. The growth rates of austenite grains at the high-temperature stage (1400~1250 °C) during the HAZ thermal cycle of steels with conventional Al deoxidation and Mg deoxidation containing 0.0027 and 0.0099 wt% Mg were 10.55, 0.89, 0.01 μm/s, respectively. It was indicated that nanoscale TiN particles formed in steel with Mg deoxidation were effective to inhibit the growth of austenite grain. The excellent HAZ toughness of steel plates after welding with a heat input of 400 kJ/cm could be obtained by control of the Mg content in steel to selectively promote the formation of IAF or retard the growth of austenite grain.

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Section: Role Of Mg Deoxidation On Improving Haz Toughnessmentioning

confidence: 97%

Mechanism of Improving Heat-Affected Zone Toughness of Steel Plate with Mg Deoxidation after High-Heat-Input Welding

Yang

Park

et al. 2020

Metals

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“…In contrast to Zang et al, 310 Lagneborg et al 300 in assessing the importance of nitrogen on HAZ toughness of MA steels, noted that low nitrogen levels,~0.003% were preferable.More recently the role of both Ti and N in line pipe steels has been reviewed by Zhu et al, 311 with the aim of advising on the optimum levels of both elements associated with the greatest HAZ toughness.They discussed the varying views reported on the recommended levels of Ti and N in the steel to avoid coarse >0.5µmTiN precipitates nucleating and growing in the liquid phase, when the TiN solubility limit is exceeded.They concluded that as they found the results in the literature contradictory, no clear recommendation could be made.…”

Section: Fig52 Near Herementioning

confidence: 84%

“…The optimum content of N was found to be 60ppm for the 0.02%Ti steel, which is close to the stoichiometric composition. 310 The HAZ toughness of low carbon steels with different N contents was also investigated by Mukae et al, 320 Insol.Ti has only a minor effect. They proposed that a decrease in N content in solution can significantly improve HAZ toughness.…”

Section: Fig52 Near Herementioning

confidence: 99%

Titanium microalloyed steels

Baker

2018

Ironmaking & Steelmaking

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For many years titanium has been regarded as a relative minor element in microalloyed steels compared with niobium and vanadium. However, over the past decade or so, titanium compounds in microalloyed steels have been recognized as having a wider role than just involved in austenite grain refinement.This is considered in the present review. The background and brief history are followed by sections dealing with the physical state of titanium and compounds of titanium, including borides, carbides, nitrides, oxides and sulphides characterized in MA steels. Many of the investigations on the solubility of these compounds in iron, and the precipitates they form, are considered, which leads to their functions in controlling the mechanical and toughness properties of MA steels.This now often involves the multiple alloying additions of titanium, niobium and vanadium with both carbon and nitrogen, and the morphologies of the various precipitates characterized in MA steels is presented. Titanium has become an important element in the development of line pipe steels, which for the higher grades have moved to bainite/acicular ferrite microstructures. The influence of Ti in the nucleation of acicular ferrite is an active research area, particularly with regard to the use made of titanium compounds in welding of MA steels. Finally, consideration is given to the influence of titanium on hot ductility and how titanium additions behave during continuious casting and thin slab direct charging processes.

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“…[11,12] However, TiN particles dissolve upon exposure to temperatures > 1350°C , thereby losing the pinning effect on grain boundaries. [13] Conventional methods regarding increasing the thermal stability of TiN focus on increasing the N content and N/Ti ratio, but this increases the concentration of solute N as well, which is detrimental to the toughness. [14,15] Recently, Kato et al have reported that Ca addition to HSLA steels can effectively improve the finely dispersing TiN particles and inhibit the coarse TiN particles.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Impact Toughness of the Welding Heat-Affected Zone in High-Strength Low-Alloy Steels through Ca Deoxidation

Zhang

Yang

Liu

et al. 2021

Metall Mater Trans A

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Thick high-strength low-alloy (HSLA) steel plates with excellent large heat input welding properties are increasingly demanded to build super-large container ships for the globally flourishing marine trade. This article describes the effect of Ca content on the TiN particles, microstructure and impact toughness of the simulated coarse-grained heat-affected zone (CGHAZ) in HSLA steels after large heat input welding at 400 kJ/cm. The quantitative analyses on TiN particles demonstrate that the number densities of the submicron-and nano-scale particles increase with increasing Ca content, but the particle sizes appear to be independent of the Ca content. The prior austenite grains in the CGHAZs of the HSLA steels are comparably coarse, including a small number of extremely large grains, except for 25Ca steel, whose grains are relatively fine and uniform. Moreover, only the impact toughness of the CGHAZ in 25Ca steel is satisfactorily improved with a small test variability, and this could be attributed to the improved precipitation of the submicron-scale TiN particles that effectively refine the grains. Based on the experimental and thermodynamic results, it is strongly recommended to increase the Ca content to > 0.0019 wt pct for the related HSLA steel system in the future steel optimization.

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Enhancement of Heat-Affected Zone Toughness of a Low Carbon Steel by TiN Particle

Cited by 22 publications

References 15 publications

Mechanism of Improving Heat-Affected Zone Toughness of Steel Plate with Mg Deoxidation after High-Heat-Input Welding

Mechanism of Improving Heat-Affected Zone Toughness of Steel Plate with Mg Deoxidation after High-Heat-Input Welding

Titanium microalloyed steels

Improvement of Impact Toughness of the Welding Heat-Affected Zone in High-Strength Low-Alloy Steels through Ca Deoxidation

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