Effect of Finish Rolling Temperature on the Microstructure and Tensile Properties of Nb–Ti Microalloyed X90 Pipeline Steel

Guo, Bin; Fan, Lei; Wang, Qian; Fu, Zhibin; Wang, Qingfeng; Zhang, Fucheng

doi:10.3390/met6120323

Cited by 12 publications

(16 citation statements)

References 43 publications

(56 reference statements)

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“…In addition to previously mentioned micro-alloying methods, the reasonably-designed schedule for Thermo-Mechanical Controlled Processing (TMCP) is also essential for the desired microstructure and mechanical properties. Previous studies [12,13] have extensively estimated the effects of TMCP parameters for two-stage controlled rolling and cooling including the finish rolling temperature (FRT) [14] and the hot rolling reduction (HRR) [13,15], which accelerated the cooling rate (ACR) [16] on the γ→α phase transformation, the final microstructure, and the mechanical properties. These investigations reported that the microstructure comprising quasi polygonal ferrite (QPF), acicular ferrite (AF), granular bainitic ferrite (GBF), and/or lath bainitic ferrite (LBF) as well as a small amount of martensite-austenite (M-A) constituent normally developed in a low-C niobium (Nb)-microalloying steel.…”

Section: Introductionmentioning

confidence: 99%

“…These investigations reported that the microstructure comprising quasi polygonal ferrite (QPF), acicular ferrite (AF), granular bainitic ferrite (GBF), and/or lath bainitic ferrite (LBF) as well as a small amount of martensite-austenite (M-A) constituent normally developed in a low-C niobium (Nb)-microalloying steel. The decreased FRT [14] and the increased ACR [17] could lead to an effective ferritic and/or bainitic grain refinement and an increasing dislocation density, which ultimately resulted in the enhanced yield strength (YS) and impact toughness and, in turn, the elevated yield ratio (YR). However, when the ACR is above a critical value, a hard phase of martensite (M), for example, could form, which is probably detrimental to the ductility and/or toughness.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it is vital to optimize the ACR for consequently producing an even stronger and tougher microstructure via an effectively control of the γ→α transformation. It was also proposed that, for an appropriate combination of high YS and low YR, both the soft ferritic phase in an appropriate effective grain size and a hard M-A constituent phase in proper morphology should be controlled through properly regulating the FRT [14] or the ACR [17].…”

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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…At low temperature, the grain size is small as a result high density of grain boundaries occurs which hinders the movement of dislocations, results in enhancement of yield strength. 40,41…”

Section: Resultsmentioning

confidence: 99%

Effect of pre-rolling temperature on the interfacial properties and formability of steel-steel bilayer sheet in Single Point Incremental Forming

Hassan

Hussain

Ali

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part B:

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The aim of this research was to investigate the effect of pre-rolling temperature on the interfacial properties in delamination modes 1 and 2; and formability in Single Point Incremental Forming (SPIF) of Steel-Steel (St-St) bilayer sheet prepared by roll bonding process. The roll bonding process was performed at three pre-rolling temperatures, 700°C, 800°C, and 950°C, with a constant thickness reduction ratio of 58%. The bond strength and critical strain energy release rate (CSERR) were measured to characterize the interface of St-St bilayer sheet. T-peel test for mode 1 and tensile shear test for mode 2 were conducted to determine the interfacial properties. The formability of St-St bilayer sheet in SPIF was measured in terms of maximum wall angle. The results showed that the increase in pre-rolling temperature from 700°C to 950°C enhanced the bond strength and CSERR, in both mode 1 and 2. The enhancement in bond strength with an increase in pre-rolling temperature was 149.5% and 203% in mode 1 and 2, respectively. However, the increase in CSERR in mode 1 and 2 was 115% and 367%, respectively. The formability of St-St bilayer sheet also showed an increasing trend with an increase in pre-rolling temperature. Moreover, a consistent relation between formability and interfacial parameters was observed. It was also found that to successively deform the bilayer sheet into the desired shape, it is necessary for the sheet to be heated above the critical temperature during fabrication to facilitate good bonding between two sheets.

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“…Smith et al, 223 who investigated Mn-Mo-Nb steels, were among the first to develop AF microstructures in line pipe steels.More recently, AF microstructures formed in titanium steels have been studied extensively. [252][253][254][255][256][257][258] Acicular ferrite, also referred to as intragranular ferrite (IGF), has been recognized as a separate phase in steels for over 40 years, initially in arc welded deposits of low alloy steels, to be discussed later,where it was most commonly present due the transformation of austenite, during cooling at intermediate transformation temperatures of 650 to 500°C. 216 AF has been found to improve HAZ toughness 259,260 and is also observed in wrought steels which have been deliberately inoculated with non-metallic inclusions.…”

Section: Acicular Ferrite In Ma Steels With Particular Reference To Tmentioning

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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Effect of Finish Rolling Temperature on the Microstructure and Tensile Properties of Nb–Ti Microalloyed X90 Pipeline Steel

Cited by 12 publications

References 43 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

Effect of pre-rolling temperature on the interfacial properties and formability of steel-steel bilayer sheet in Single Point Incremental Forming

Titanium microalloyed steels

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