The mechanism of intragranular ferrite formed on Ti-rich (Ti,V)(C,N) precipitates in the coarse heat affected zone of a V–N–Ti microalloyed steel

Shi, Zhongran; Chai, Xiaoyan; Cao, Feng; Su, Hang; Pan, Tao; Wang, Qingfeng; Wang, Ruizhen; Yang, Chao

doi:10.1016/j.matlet.2016.04.033

Cited by 31 publications

(12 citation statements)

References 16 publications

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“…The transformation products of PF, AF, and GBF were in sequence of the phase transition temperature domain, according to previous studies [24,25]. In addition, the PF/AF nucleates possibly at the Ti-riched (Ti,V)(C,N) particles [10] and in the dislocation substructure [26]. Furthermore, Figures 5 and 6 demonstrate that the amount of PF and AF increased with the changes from CP-A to CP-E.…”

Section: Effect Of the Cooling Path On The Pf + Af + Gbf Matrixsupporting

confidence: 79%

“…[7]. Particularly, previous works have shown that the appropriate nitrogen (N) addition to low-C vanadium microalloying steels could lead to a high-density fine particles of V(C, N) precipitate and a simultaneous fine-grained ferritic microstructure via the pinning [8,9] and heterogeneously nucleating effects [10]. In addition, their high heat-input weldability could be improved through the intragranular polygonal/acicular ferrite (IGPF/IGAF) nucleation at (Ti, V)(C, N) particles in the coarse-grained heat affected zone (CGHAZ), which could be enhanced by an appropriately-controlled N content [10,11].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Cooling Path on Microstructure Features and Tensile Properties in a Low Carbon Mo-V-Ti-N Steel

Xiao

Shi

Zhang

et al. 2018

Metals

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The two-stage controlled rolling and cooling of a low carbon Mo-V-Ti-N steel at different cooling paths was simulated through a Gleeble 3500 system. The microstructure and tensile properties of each sample were examined by estimating their dependence on the cooling paths. It was indicated that a mixed microstructure of polygonal ferrite (PF), acicular ferrite (AF), granular bainitic ferrite (GBF), and a martensite-austenite (M-A) constituent was developed in each sample. Results showed that application of the reduced cooling rate and elevated finishing cooling temperature led to the increases in the effective ferrite grain size and the precipitate amount despite a decrease in dislocation density, which eventually resulted in the overall yield strength. It also led to an increasing amount of M-A constituent, which lowered the yield ratio and, thereby, enhanced the capacity for strain hardening. In addition, the underlying mechanism for the correlations among the cooling path, the microstructure, and the yield strength was considered.

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Section: Effect Of the Cooling Path On The Pf + Af + Gbf Matrixsupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Effect of Cooling Path on Microstructure Features and Tensile Properties in a Low Carbon Mo-V-Ti-N Steel

Xiao

Shi

Zhang

et al. 2018

Metals

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“…Hu et al studied the acicular intragranular ferrite nucleation in a V–Ti low‐carbon steel, and the (Ti, V)(C, N) particles with V‐rich caps were regarded as the nucleation sites . Shi et al observed the similar particles while investigating the intragranular ferrite formation in the heat affected zone of a V–Ti–N steel, and the intragranular ferrite was proved to hold the Baker‐Nutting orientation relationship with the (Ti, V)(C, N) particles . Moreover, related studies also indicated that the Mn‐depleted zone formed around Ti 2 O 3 particles could drive the intragranular ferrite nucleation, which provided a new prospect for the formation of intragranular ferrite in Ti bearing steels .…”

Section: Introductionmentioning

confidence: 89%

Intragranular Ferrite Formed in a V–Ti–N Medium‐Carbon Steel Containing MnS Inclusions

Zhao

Zhou

et al. 2017

steel research int.

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This paper studies the formation of intragranular ferrite in a V-Ti-N medium-carbon steel containing MnS inclusions. The (Ti, V)(C, N) particles precipitating on MnS inclusions are confirmed to be the main nucleation sites of intragranular ferrite. Because of the small lattice mismatch and low-energy ferrite/V(C, N) interphase boundary, the vanadium-rich edge of (Ti, V)(C, N) particles increases the nucleation potency of intragranular ferrite. The interphase of MnS inclusions and austenite provides suitable sites for (Ti, V)(C, N) particles to grow big enough to reach the critical size for intragranular ferrite nucleation. Furthermore, the efficiency of the formation of intragranular ferrite starts to increase rapidly when the length of MnS inclusions decreases to less than 10 mm. The shape of intragranular ferrite is also significantly influenced by the length of MnS inclusions. In addition, the intragranular ferrite is confirmed to have a new type of orientation relationship with the particles precipitating in liquid phase, which indicates that the orientation relationship between the intragranular ferrite and (Ti, V)(C, N) particles is not sole, but diversified.

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“…Wang He Yu's research showed that the surface of 1Cr18Ni9Ti stainless steel was surface nanocrystallization after high-energy shot peening treatment, and the sample had excellent pitting resistance in chloride solution [5]. Onizawa and Islam et al Reported that shot peening improved the corrosion resistance and fatigue properties of austenitic stainless steel [10]. However, there are conflicting views on the corrosion behavior of nanostructured layers on the metal surface.…”

Section: Introductionmentioning

confidence: 99%

Influence of shot peening on corrosion behavior of low alloy steel

Qiao

Guo

et al. 2020

Mater. Res. Express

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Surface modification is an important technique for maintaining relatively favorable mechanical properties to surface properties and corrosion resistance. In this study, Surface shot peening technology is applied to low alloy steel production nanocrystallines. The microstructure near the surface layer was characterized by x-ray diffraction, transmission electron microscopy and electron backscatter diffraction. The corrosion behavior of the shot-treated surface layer was analyzed by polarization and pitting test, and the surface morphology of the corroded sample was observed by a scanning electron microscope. The results showed that the surface layer of the alloy after shot peening can be divided into three parts: equiaxed nanoparticle layer (NG), ultrafine grain layer (FG) and elongated fine grain layer (EG). Surface nanocrystallization improved the potential polarization behavior of low alloy steel in 3.5% NaCl solution. The microhardness of the near surface region showed a significant increase compared to the as-received steel sample, showing a more stable electrochemical performance. Shot peening also significantly reduced the pitting rate and maximum pitting depth in 10% FeCl3 solution. The surface nano-layer structure produced by the shot peening process could provide more nucleation sites, thereby improving the uniformity and compactness of the passivation film, resulting in better corrosion resistance. The above experimental results clearly showed that the overall and local corrosion resistance of the low alloy carbon steel in the chloride ioncontaining solution can be improved by shot peening.

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The mechanism of intragranular ferrite formed on Ti-rich (Ti,V)(C,N) precipitates in the coarse heat affected zone of a V–N–Ti microalloyed steel

Cited by 31 publications

References 16 publications

Effect of Cooling Path on Microstructure Features and Tensile Properties in a Low Carbon Mo-V-Ti-N Steel

Effect of Cooling Path on Microstructure Features and Tensile Properties in a Low Carbon Mo-V-Ti-N Steel

Intragranular Ferrite Formed in a V–Ti–N Medium‐Carbon Steel Containing MnS Inclusions

Influence of shot peening on corrosion behavior of low alloy steel

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