On the determining role of acicular ferrite in V-N microalloyed steel in increasing strength-toughness combination

Hu, Jun; Du, Linxiu; Miao, Zhuang; Yin, Shaojiang; Wang, Y.G.; Qi, Xiangyu; Gao, Xiuhua; Misra, R.D.K.

doi:10.1016/j.matchar.2016.06.027

Cited by 53 publications

(8 citation statements)

References 47 publications

(62 reference statements)

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“…Research on IAFs induced by inclusions is still in the nascent stage [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. The exact mechanism of the nucleation process, by which inclusions induce IAF, has not yet been elucidated.…”

Section: Introductionmentioning

confidence: 99%

Research of microalloy elements to induce intragranular acicular ferrite in shipbuilding steel

Zhu

Wang

Shuo-ming

et al. 2017

Ironmaking & Steelmaking

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Based on the minimum degree of disregistry mechanism in oxide metallurgy, laboratory and industrial research have been conducted on intragranular acicular ferrite (IAF) induced by microalloying elements in austenite. Based on the chemical compositions of DH36 steel and Mg, Al, Ti, V, Nb microalloyed steel, experimental results show that in ingots' organization, both V and Nb can induce IAF, but when the adding sequence was Al-Mg-Ti, smaller and dispersion inclusions were formed in austenite. When the Mg content was 0.005 wt%, the inclusion structure induced IAF in austenite is as follows: MgO and Al 2 O 3 forms the core and TixOy adheres to the Al-Mg complex inclusions to produce smaller particle size and dispersions of Al, Mg, Ti complex inclusions. Finally, upon lowering the temperature, carbonitrides of Ti, V, and Nb were precipitated on the outermost layer of the inclusions. These carbonitrides with small disregistry contribute to induce intragranular acicular ferrite.

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Section: Introductionmentioning

confidence: 99%

Research of microalloy elements to induce intragranular acicular ferrite in shipbuilding steel

Zhu

Wang

Shuo-ming

et al. 2017

Ironmaking & Steelmaking

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“…The formation of an IGAF in CGHAZ divided the primary austenitic grain into several parts, which resulted in grain refinement [6,23], as shown in figure 10(a). In addition, Hu et al [24] confirmed that interlocked AF plates could hinder crack propagation, thus improving the impact toughness. The grain size and distribution of high-angle grain boundaries varied significantly with the heat input (figure 13), which is the main reason for the different impact energies.…”

Section: Effect Of Heat Input On the Cghaz Impact Toughnessmentioning

confidence: 97%

Improvement of impact toughness by microstructure refinement of simulated CGHAZ through enhancing welding heat input of low carbon Mo-V-Ti-N-B steel

Fan¹,

Shi²,

Wang³

et al. 2022

Mater. Res. Express

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Welding heat input greatly influences the microstructure and impacts the affected zone's toughness. To interpret the relationships between the welding heat input, microstructure, and low-temperature toughness of the coarse-grained heat-affected zone (CGHAZ) of Mo-V-Ti-N-B steels, welding heat cycles with different heat inputs (25–75 kJ/cm) were performed on a Gleeble 3500 simulator. Intragranular ferrite in the simulated samples subjected to different thermal cycles was characterized and quantified, and the impact energies of simulated samples were evaluated at -20 °C. Upon increasing the heat input, the intragranular ferrite content rose sharply from 4.3% to 76.0%. The V(C,N) enrichment on the precipitate surface increased the size of precipitates, providing favourable nucleation conditions for intragranular ferrite. The prior austenite grain (PAG) and martensite/austenite (M/A) constituents became rough, and the content of the M/A constituent increased while the impact energy of the CGHAZ increased. This behaviour occurred due to the formation of intragranular acicular ferrite (IGAF), which refined the microstructure of the CGHAZ. Grain refinement eliminated the negative influence of higher M/A content on the impact toughness of the CGHAZ.

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“…The HAZ of the TIG-MIG joint is characterized by chaotic lenticular acicular ferrite. Acicular ferrite is known to improve the strength and toughness of steel, as appraised by Loder et al [18] , Babu [19] , Bahu and Bhadeshia [20] , Capdevila et al [21] and Hu et al [22] . He and Edmonds [23] also stated that acicular ferrite is desirable in low carbon steel weldments as it improves the toughness over all other austenite transformation products.…”

Section: Macrostructure and Microstructurementioning

confidence: 99%

Comparative study between TIG-MIG Hybrid, TIG and MIG welding of 1008 steel joints for enhanced structural integrity

et al. 2022

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On the determining role of acicular ferrite in V-N microalloyed steel in increasing strength-toughness combination

Cited by 53 publications

References 47 publications

Research of microalloy elements to induce intragranular acicular ferrite in shipbuilding steel

Research of microalloy elements to induce intragranular acicular ferrite in shipbuilding steel

Improvement of impact toughness by microstructure refinement of simulated CGHAZ through enhancing welding heat input of low carbon Mo-V-Ti-N-B steel

Comparative study between TIG-MIG Hybrid, TIG and MIG welding of 1008 steel joints for enhanced structural integrity

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