Improved Toughness of Weld Fussion Zone by Fine TiN Particles and Development of a Steel for Large Heat Input Welding

Kanazawa, Shogo; Nakashima, Akira; Okamoto, K.; Kanaya, Ken

doi:10.2355/tetsutohagane1955.61.11_2589

Cited by 71 publications

(38 citation statements)

References 2 publications

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“…You XIE, 1) * Guoguang CHENG, 1) Xiaoling MENG, 1) Lie CHEN 2) and Yandong ZHANG The characteristics and thermal stability of the primary precipitates in H13 ingot modified with 0.034 wt% Ti were studied. A large number of (Ti,V) carbonitrides were observed, including the homogeneous Ti-rich ones and the inhomogeneous Ti-V-rich ones.…”

Section: Precipitation Behavior Of Primary Precipitates In Ti-microalmentioning

confidence: 99%

“…Titanium has been widely used as a microalloying element in steels to prevent the coarsening of austenite through a dispersion of fine TiN particles, such as the improvement of toughness of weld heat affected zone, [1][2][3][4][5] or increasing the fraction of equiaxed grains in solidification structure through the heterogeneous nucleation of δ-phase on TiN or TiN + oxide. [6][7][8] The selection and control of particle size is important to the utilization efficiency of titanium.…”

Section: Introductionmentioning

confidence: 99%

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Precipitation Behavior of Primary Precipitates in Ti-microalloyed H13 Tool Steel

et al. 2016

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Section: Precipitation Behavior Of Primary Precipitates In Ti-microalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Precipitation Behavior of Primary Precipitates in Ti-microalloyed H13 Tool Steel

et al. 2016

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“…There are two major technologies used for grain size refinement [8][9][10]12]: refinement of the austenite grain size before the austenite to ferrite transformation ( figure 15(a)), and the application of an intragranular ferrite transformation ( figure 15(b)). The latter is initiated with the use of TiN to provide nucleation sites [54]. A variety of such inclusions (e.g.…”

Section: High Haz Toughness Technologiesmentioning

confidence: 99%

Progress in thermomechanical control of steel plates and their commercialization

Nishioka

Ichikawa

2012

Science and Technology of Advanced Materials

100

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The water-cooled thermomechanical control process (TMCP) is a technology for improving the strength and toughness of water-cooled steel plates, while allowing control of the microstructure, phase transformation and rolling. This review describes metallurgical aspects of the microalloying of steel, such as niobium addition, and discusses advantages of TMCP, for example, in terms of weldability, which is reduced upon alloying. Other covered topics include the development of equipment, distortions in steel plates, peripheral technologies such as steel making and casting, and theoretical modeling, as well as the history of property control in steel plate production and some early TMCP technologies. We provide some of the latest examples of applications of TMCP steel in various industries such as shipbuilding, offshore structures, building construction, bridges, pipelines, penstocks and cryogenic tanks. This review also introduces high heat-affected-zone toughness technologies, wherein the microstructure of steel is improved by the addition of fine particles of magnesium-containing sulfides and magnesium-or calcium-containing oxides. We demonstrate that thanks to ongoing developments TMCP has the potential to meet the ever-increasing demands of steel plates.

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“…TiO and TiN are cubic structure and have a higher lattice consistency with that of ferrite, therefore, they create a lower energy interface around themselves. As a result, ferrite precipitation can be promoted on TiO 19) or TiN 50) particles. TiO is supposed to work as a heterogeneous nucleation site on solidified microstructure, δ-ferrite precipitation, whose crystal structure is the same as that of α-ferrite.…”

Section: Ferrite Precipitationmentioning

confidence: 99%

Micro-structure Refinement in Low Carbon High Manganese Steels through Ti-Deoxidation, Characterization and Effect of Secondary Deoxidation Particles

Kikuchi¹,

Nabeshima²,

Yamashita³

et al. 2011

ISIJ Int.

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This paper investigates the effect of de-oxidation inclusions on micro-structure in low carbon (0.07 mass%), high Mn (0.9 mass%) steel. De-oxidation tests were carried out by adding either aluminum (0.05 mass%) or titanium (0.05, 0.03 or 0.015 mass%) to an iron melt in a 400 g-scale vacuum furnace. A Confocal Scanning Laser Microscope (CSLM) was used to evaluate the effect of cooling rate by re-melting and quenching during solidification. Fine secondary de-oxidation particles were obtained in the Ti-killed samples, and the particle density increased with increasing oxygen content, and their size decreased with increasing the cooling rate during solidification.The secondary Ti de-oxidation particles were found to have an effect on microstructure evolution, such as solidifying microstructure, austenite grain growth and austenite decomposition. The de-oxidation particles were examined through FE-TEM and were identified to be TiO, MnTiO3 and Mn2TiO4, in low oxygen ([O]=7 ppm) and high oxygen ([O]=56, 81 ppm) Ti-killed steels respectively, which were qualitatively same as those predicted by thermodynamic calculations. Stabilities of TiO, MnTiO3 and Mn2TiO4 are influenced by Mn presence. Composition change and decomposition of oxide were estimated through thermodynamic calculations. The effect of the particles on ferrite formation was evaluated through thermo-mechanical treatments. TiO was the most effective for promoting ferrite formation through heterogeneous nucleation. The particles contributed to ferrite formation in the following order, TiO>TiN>MnS> MnTiO3>Ti2O3.It was found that the secondary Ti de-oxidation particles work are engulfed by the advancing solid phase during solidification based on analysis with PET (Pushing Engulfment Transition) velocity, particle sizes and solidification rates. The particles at dendrite tips and inter-dendritic regions are likely restraining the molten steel flow resulting in a finer solidification microstructure.

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Improved Toughness of Weld Fussion Zone by Fine TiN Particles and Development of a Steel for Large Heat Input Welding

Cited by 71 publications

References 2 publications

Precipitation Behavior of Primary Precipitates in Ti-microalloyed H13 Tool Steel

Precipitation Behavior of Primary Precipitates in Ti-microalloyed H13 Tool Steel

Progress in thermomechanical control of steel plates and their commercialization

Micro-structure Refinement in Low Carbon High Manganese Steels through Ti-Deoxidation, Characterization and Effect of Secondary Deoxidation Particles

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