Relationships among microstructure, precipitation and mechanical properties in different depths of Ti–Mo low carbon low alloy steel plate

Liu, Cheng; Cai, Qingwu; Xie, Bao-sheng; Zhang, Ning; Zhou, Xiao-cui; Li, Gaosheng

doi:10.1016/j.msea.2015.10.055

Cited by 24 publications

(7 citation statements)

References 23 publications

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“…9(b) reveals that the precipitates were generally fine in the tested steel, with 80.7% and 75.5% of total precipitates smaller than 96 nm when coiled at 600°C and 640°C, respectively. The fine nanosized precipitates nucleated during the coiling process are expected to induce significant strengthening in steels, 20) which can be quantified by the Ashby-Orowan model according to the theory of Gladman 21) and described as (2) where σ denotes the strength addition attributed to precipitation strengthening (MPa); r is the radius of precipitates (nm); μ is the shear modulus (equal to 80.26 × 10 3 MPa for ferrite low carbon steels); b is the Burgers vector (equal to 2.48 × 10 − 4 μm); and f represents the volume fraction of precipitates. According to Eq.…”

Section: Precipitation Behaviormentioning

confidence: 99%

Effects of Coiling Temperature on Microstructure and Precipitation Behavior in Nb–Ti Microalloyed Steels

Tang

2018

ISIJ International

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This paper presents our latest studies on the effects of coiling temperature on the microstructure, precipitation behavior, and mechanical properties of an Nb-Ti microalloyed steel produced by endless strip processing (ESP) and coiled at different temperatures. The amounts of soluble elements were measured using inductively coupled plasma optical emission spectrometry (ICP-OES). The microstructure and precipitates were analyzed using SEM, EBSD, TEM, and electrolytic dissolution and filtration tests. The results revealed that large amounts of microalloying elements were still in solution before coiling. As the coiling temperature decreased from 600°C to 560°C, the content of acicular ferrites (AF) increased and the average ferritic grain size was refined from 2.01 μm to 1.29 μm, the yield strength and tensile strength of the tested steel increased by 22 MPa and 20 MPa, respectively, under the effect of microstructural strengthening. As the coiling temperature increased from 600°C to 640°C, the mass fraction of precipitates increased from 0.083% to 0.110% and the percentage of fine precipitates (smaller than 18 nm) increased from 12.2% to 14.7%; the intense precipitation strengthening effect increased the yield strength and tensile strength by 35 MPa and 42 MPa, respectively. Therefore, as the coiling temperature decreased from 640°C to 560°C, the strength of the tested steel decreased first and then increased while the elongation decreased steadily from 18.9% to 14.1% due to the increasing content of AF.

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Section: Precipitation Behaviormentioning

confidence: 99%

Effects of Coiling Temperature on Microstructure and Precipitation Behavior in Nb–Ti Microalloyed Steels

Tang

2018

ISIJ International

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“…Few investigations have been devoted to a theoretical investigation of this problem [20][21][22][23][24][25]. On the other hand, the results of experimental studies [26][27][28] indicate the possibility of a significant increase in the indicators of strength, plasticity, and stamping of steel of this type while using an extremely economical alloying system. In addition, the problem of the possible superposition of phase precipitates of various types (formed in austenite, ferrite, and during fcc-bcc transformation) for the principal enhancement of the complex of properties of steel, including the difficult to combine characteristics, has not yet been practically studied.…”

Section: Promising Directions Of Using Phase Precipitates For the Primentioning

confidence: 99%

Promising directions of increasing the properties of steel

Зайцев¹,

Koldaev²,

Arutyunyan³

2018

Nanosystems: Phys. Chem. Math.

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The study of regularities of the formation and evolution of nonmetallic inclusions and phase precipitates in modern structural steels has been carried out. It has been shown that the formation of several types of complex nonmetallic inclusions results in a substantial increase in the complex of steel properties and neutralizing the negative influence of impurities while a reduction in costs. An even more significant improvement in the properties of steel can be achieved by controlling the characteristics of carbide, carbonitride, and other types of phase precipitates. Herewith, ferritic steels are the most promising. The previously unreachable complex of indicators of difficult to combine service properties of these steels has been achieved by the formation of a homogeneous fine-dispersed microstructure and a volumetric system of primarily interphase precipitates. Based on established principles, effective technologies for the production of a wide range of various types of steels have been developed.

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“…Advanced thick steel plates are important structural materials for ship hulls, pressure vessels, bridges, buildings, and offshore structures [8][9][10][11]. The general trend for them is achieving higher strength and maintaining or improving other properties simultaneously, and also guaranteeing homogeneity in thickness.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Cooling Rate on the Microstructure Evolution and Mechanical Properties of Ti-Microalloyed Steel Plates

et al. 2022

Materials

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Ti-bearing microalloyed steel plates with a thickness of 40 mm were subjected to ultra-fast cooling (UFC) and traditional accelerate cooling after hot-rolling, aiming to investigate the effect of cooling rate on the microstructure and mechanical properties homogeneity, and thus obtain thick plates with superior and homogeneous mechanical properties. Yield strength, tensile strength, and elongation were 642 MPa, 740 MPa, 19.2% and 592 MPa, 720 MPa and 16.7%, respectively, in the surface and mid-thickness of the steel with ultra-fast cooling, while in the steel with traditional accelerate cooling, 535 MPa, 645 MPa, 23.4% and 485 MPa, 608 MPa, 16.2% were obtained in the surface and mid-thickness of the plate. The yield strength has been greatly improved after UFC, for the refinement of grain and precipitates produced by UFC. In addition, the equivalent grain size and precipitates size in the thick plate with UFC are homogeneous in the thickness direction, leading to uniform mechanical properties. The crystallographic characteristics of different precipitates have been studied. The precipitates formed in the austenite deformation stage obey Kurdjumov–Sachs orientation relationship with the ferrite matrix, while the fine precipitates formed in the ferrite obey [112]MC//[110]α and (1¯1¯1)MC//(1¯12)α orientation relationship with the ferrite matrix.

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Relationships among microstructure, precipitation and mechanical properties in different depths of Ti–Mo low carbon low alloy steel plate

Cited by 24 publications

References 23 publications

Effects of Coiling Temperature on Microstructure and Precipitation Behavior in Nb–Ti Microalloyed Steels

Effects of Coiling Temperature on Microstructure and Precipitation Behavior in Nb–Ti Microalloyed Steels

Promising directions of increasing the properties of steel

The Effect of Cooling Rate on the Microstructure Evolution and Mechanical Properties of Ti-Microalloyed Steel Plates

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