Compositional and microstructural changes which attend reheating and grain coarsening in steels containing niobium

Palmiere, E.J.; García, C. I.; Ardö, Anders

doi:10.1007/bf02647973

Cited by 150 publications

(69 citation statements)

References 27 publications

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“…The considerable difference between the solubility products can be attributed to the fact that each and every of the techniques used to obtain the solubility products has its own limitations and assumptions. The details are reviewed elsewhere [60,72].…”

Section: Solubility Productmentioning

confidence: 99%

“…Palmiere et al [72] has proposed a solubility product for stoichiometric NbC derived from data measured using an atom probe field ion microscope. The data was measured on a steel being reheated and quenched with composition of 0.08 wt% C, 1.5 wt% Mn, 0.08 wt% N and 0.02 wt% Nb.…”

Section: Solubility Productmentioning

confidence: 99%

“…It is noteworthy that the comparison between this solubility product and several early solubility products shows that the early ones substantially underestimate the stability of Nb precipitates, hence the solubility temperature [72]. The solubility product has been used in other researches [35,[73][74][75].…”

Section: Solubility Productmentioning

confidence: 99%

“…The austenite grains gradually increase in size with a relative uniform equiaxed shape. However, microalloyed steels show discontinuous grain growth behaviour [72,105].…”

Section: Grain Growth Inhibition By Particle Pinningmentioning

confidence: 99%

“…Hence, only a small amount of coarse and widely-spaced particles remains. They are ineffective in pinning the grain boundary movement [72,105].…”

Section: Grain Growth Inhibition By Particle Pinningmentioning

confidence: 99%

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Thermomechanical Processing of Structural Steels with Dilute Niobium Additions

Cui

Patel²,

Palmiere

2016

HSLA Steels 2015, Microalloying 2015 &Amp; Offshore Engineering Steels 2015

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-i - AbstractIn this thesis, the influence of various dilute Nb additions (0.005-0.02 wt%) on austenite microstructure evolution along thermomechanical processing, in terms of austenite recrystallisation and grain growth, were investigated using steels with three carbon content levels.At the homogenisation temperature of 1250°C, all dilute Nb additions were dissolved in low carbon steels whereas the Nb dissolution limits for 0.4 wt% and 0.6 wt% C steels were 0.012 wt% and 0.08 wt%, respectively. Dilute Nb additions did not show significant influence on homogenised austenite grain size. The dramatic increase in C contents was more influential, which decreased the homogenised austenite grain size.The influence of dilute Nb additions and C contents on dynamic recrystallisation behaviour was studied by rough rolling at high deformation temperature with low strain rate. The dilute Nb additions were found to increase the critical strain of dynamic recrystallisation whereas C contents showed no influence on the dynamic recrystallisation behaviour.The austenite recrystallisation behaviour after finish rolling and after the holding period between finishing passes were studied by means of interrupted plane strain compression (PSC) tests and double hit PSC tests. It was found that with low Nb supersaturation, recrystallisation happened prior to Nb precipitation. Solute Nb in austenite delayed the onset of austenite recrystallisation through solute drag effect.With high Nb supersaturation, Nb precipitation occurred before the onset of recrystallisation which completely retarded austenite recrystallisation.The austenite grain growth during the holding period between finish rolling passes was studied by the evolution of prior-austenite grain size before and after the 20s holding period at the highest finish rolling temperature (1050°C). There was no Nb precipitation found and the difference in austenite grain growth behaviour was Abstract -iiattributed to the solute drag effect from both Nb and C in solution. It was found that Nb in solution suppressed austenite grain growth. However, the effectiveness of solute Nb in suppressing austenite grain growth was affected by the C content. Acknowledgement

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Section: Solubility Productmentioning

confidence: 99%

Section: Solubility Productmentioning

confidence: 99%

Section: Solubility Productmentioning

confidence: 99%

“…The austenite grains gradually increase in size with a relative uniform equiaxed shape. However, microalloyed steels show discontinuous grain growth behaviour [72,105].…”

Section: Grain Growth Inhibition By Particle Pinningmentioning

confidence: 99%

“…Hence, only a small amount of coarse and widely-spaced particles remains. They are ineffective in pinning the grain boundary movement [72,105].…”

Section: Grain Growth Inhibition By Particle Pinningmentioning

confidence: 99%

See 3 more Smart Citations