Effects of contents of Nb and C on hot deformation behaviors of high Nb X80 pipeline steels

Qiao, Guifang; Xiao, Furen; Zhang, Xiaobing; Cao, Ya-bin

doi:10.1016/s1003-6326(09)60039-x

Cited by 38 publications

(22 citation statements)

References 5 publications

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“…Under the condition of constant deformation temperature, with the increase in Nb content, the strain rate required for dynamic recrystallization decreased, and the strain rate ranges, during which the dynamic recrystallization could occur, reduced. These results indicate that Nb content restrains the dynamic recrystallization, which is in good agreement with the experimental results in literature [21][22][23][24]. Nb is the strongest to restrain the austenite recrystallization.…”

Section: Effect Of Nb Content On the Experimental Conditions Of Dynamsupporting

confidence: 92%

Effect of Nb Content on the Hot Deformation Behavior of S460ML Steel

Zhang

Meng

Yang

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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The hot deformation behavior of S460ML steel with different Nb contents was investigated by single-pass compression experiment on the Gleeble-1500 thermo-machine simulator at deformation temperatures ranging from 900 to 1200°C and strain rates from 0.1 to 5.0 s -1 . The critical strain of dynamic recrystallization (DRC) under different conditions was determined by using working hardening rate-strain curves. The relationship between critical strain and peak strain of DRC was discussed. By means of regression analysis method, the hot deformation activation energy of steels and the mathematical model for predicting DRC critical strain were calculated and established, respectively. The results showed that DRC occurred during hot deformation. As the deformation temperature increased and strain rate decreased, the critical strain of DRC decreased. The critical strain (e c ) showed linear relationship with peak strain (e p ). As Nb content increased, the needed deformation temperature for occurring DRC increased, while the needed strain rate for it decreased. The activation energy for hot deformation of S460ML steel increased with increasing Nb content.

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Section: Effect Of Nb Content On the Experimental Conditions Of Dynamsupporting

confidence: 92%

Effect of Nb Content on the Hot Deformation Behavior of S460ML Steel

Zhang

Meng

Yang

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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“…Niobium carbide particles are very effective in preventing austenite recrystallization and the formation of "pancake" grains that transform to fine ferrite grains. [4][5][6] Thus, the precipitation of niobium carbide particles plays a major role in controlling the final microstructure and the product properties. Besides increasing the non-recrystallization temperature, the presence of precipitates also increases the austenite graincoarsening temperature 7 , which is important through controlled reheating.…”

Section: Introductionmentioning

confidence: 99%

“…A large volume of work was spent investigating the effect of niobium on the recrystallization and growth of austenite grains, 5,6,9,10 and it was found that a minor addition of niobium to the steel was sufficient to inhibit the static recrystallization of austenite and to achieve the final microstructure. 11 Similar effects were observed in titanium, and vanadium steels were found generally less marked.…”

Section: Introductionmentioning

confidence: 99%

Effect of the addition of niobium and aluminium on the microstructures and mechanical properties of micro-alloyed PM steels

Gündüz¹,

Erden²,

Karabulut³

et al. 2016

Mater. Tehnol.

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In this work, the effects of the addition of Nb and Al on the microstructures and tensile behaviours of micro-alloyed powder metallurgy (PM) steels were investigated. The microstructure of the micro-alloyed PM steels was examined by light microscope, SEM, XRD, XRF and EDS. The results indicated that the addition of (0.1, 0.15 or 0.2) % of Nb-Al increases the yield strength (YS) and the ultimate tensile strength (UTS) of the PM sintered steels. Elongation also tends to improve with an increasing Nb and Al content. In addition, the Nb and Al limit the grain growth during austenitization. Keywords: powder metallurgy, micro-alloyed steels, microstructure V delu je bil preiskovan vpliv dodatka Nb in Al na mikrostrukturo in na natezno trdnost mikrolegiranih PM jekel, izdelanih iz prahov. Mikrostruktura mikrolegiranih PM jekel je bila preiskovana s svetlobnim mikroskopom ter s SEM, XRD, XRF in EDS. Rezultati so pokazali, da dodatek (0,1, 0,15 ali 0,2) % Nb-Al pove~a mejo plasti~nosti (YS) in natezno trdnost (UTS) sintranih PM jekel. Tudi raztezek se izbolj{a s pove~ano vsebnostjo Nb in Al. Ugotovljeno je {e, da dodatek Nb in Al omejuje rast zrn med avstenitizacijo.

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“…During homogenization at higher temperature, dissolution of Nb based precipitates is highly important before hot rolling so as to control the austenite recrystallization by re-precipitation. Therefore, thermomechanical processing on linepipe steels also involves effective utilization of Nb based precipitates in pinning the austenite grain boundaries to control the final ferrite grain size [25][26][27][28][29]. Along with the grain refinement, microstructural constituents, such as acicular ferrite, bainite etc., also need to be tailored using process schedule to achieve higher strength level.…”

Section: Microstructural Characteristicsmentioning

confidence: 99%

Microstructure Evolution During Hot Deformation of a Micro-Alloyed Steel

Mandal

Rajinikanth

Kumar

et al. 2016

Trans Indian Inst Met

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In the present investigation, hot deformation by uniaxial compression of a microalloyed steel has been carried out, using a deformation dilatometer, after homogenization at 1200°C for 20 min up to strains of 0.4, 0.8 and 1.2 at different temperatures of 900, 1000 and 1100°C, at a constant strain rate of 2 s -1 followed by water quenching. In all the deformation conditions, initiation of dynamic recrystallization (DRX) is observed, however, stress peaks are not observed in the specimens deformed at 900 and 1000°C. The specimens deformed at 900°C showed a combination of acicular ferrite (AF) and bainite (B) microstructure. There is an increase in the acicular ferrite fraction with increase in strain at all these deformation temperatures. At high deformation temperature of 1100°C, coarsening of DRXed grains is observed. This is attributed to the common limitations involved in fast quenching of the DRXed microstructure, which leads to increase in grain size by metadynamic recrystallization (MDRX). The strain free prior austenite grains promote the formation of large fraction of both bainite and martensite in the transformed microstructures during cooling. The length and width of bainitic ferrite laths also increases with increase in deformation temperature from 900 to 1100°C and decrease in deformation strain.

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Effects of contents of Nb and C on hot deformation behaviors of high Nb X80 pipeline steels

Cited by 38 publications

References 5 publications

Effect of Nb Content on the Hot Deformation Behavior of S460ML Steel

Effect of Nb Content on the Hot Deformation Behavior of S460ML Steel

Effect of the addition of niobium and aluminium on the microstructures and mechanical properties of micro-alloyed PM steels

Microstructure Evolution During Hot Deformation of a Micro-Alloyed Steel

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