Journal ArticleDOI
Effect of zirconium additions on austenite grain coarsening of C-Mn and microalloy steels
K. He,T.N. Baker +1 more
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In this paper, the effect of zirconium carbonitrides on grain coarsening behavior in controlled rolled Al-killed Zr and Zr-Nb microalloyed HSLA steels with various Zr/N ratios (2.8-22) has been studied, and compared with those of Ti-bearing carbonit rides in Ti and Ti Nb-Zr steels.Abstract:
The effect of zirconium carbonitrides on austenite grain coarsening behaviour in controlled rolled Al–killed Zr and Zr–Nb microalloyed HSLA steels with various Zr/N ratios (2.8–22) has been studied, and compared with those of Ti-bearing carbonitrides in Ti–Nb and Ti–Nb–Zr steels. TEM observations and PEELS analysis showed that, in the Zr and Zr–Nb steels, with hypo Zr additions(Zr/N=2.8–6.3), the Zr-bearing particles were large ZrN-rich carbonitrides with sizes from ≈100 nm to several microns and of irregular shape, while with hyper Zr additions(Zr/N=15–22), which were far from stoichiometry (Zr/N=6.5), fine spherical particles of Zr-rich Zr carbonitrides(10–100 nm) were formed together with many more large ZrC-rich carbonitrides. Moreover, only in the steel with the lowest Zr/N ratios, i.e. 2.34 for the 0.011 Zr steel, and 2.75 for the 0.022Zr–Nb steels, was a significant fraction of AlN formed. Austenite grain coarsening occurred around 1050–1100°C in all the hypo Zr and Zr–Nb steels because very few small carbonitrides(read more
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Journal ArticleDOI
Titanium microalloyed steels
TL;DR: Compared with niobium and vanadium, titanium has been regarded as a relative minor element in microalloyed (MA) steels and has been recognized as having high toxicity as mentioned in this paper.
Journal ArticleDOI
The Influence of Niobium Microalloying on Austenite Grain Coarsening Behavior of Ti-modified SAE 8620 Steel
TL;DR: In this article, the potential for suppressing unacceptable austenite grain growth during carburizing by Nb microalloying additions in the range of 0.02 to 0.11 wt% to a Ti-modified SAE 8620 steel were evaluated.
Journal ArticleDOI
Effect of Magnesium on the Austenite Grain Growth of the Heat-Affected Zone in Low-Carbon High-Strength Steels
Kai Zhu,Zhenguo Yang +1 more
TL;DR: In this paper, the effect of Mg on the grain growth of the heat-affected zone (HAZ) in low-carbon high-strength steels was investigated using a confocal scanning laser microscope.
Journal ArticleDOI
Role of zirconium in microalloyed steels: a review
TL;DR: A review of the properties of zirconium in steel can be found in this article, where the main use of additions of ZIRconium to steel was for combination preferentially with sulphur, to avoid the formation of manganese sulphide, known to have a deleterious influence of the impact toughness of wrought and welded steel.
Journal ArticleDOI
Analysis and visualization of multiply oriented lattice structures by a two-dimensional continuous wavelet transform.
H. M. Singer,I. Singer +1 more
TL;DR: A two-dimensional wavelet transform has been developed, which is capable of extracting grain boundaries and the lattice orientation of a grain relative to a laboratory frame of reference, and can be applied to results of other atomistic simulations, e.g., molecular dynamics or granular materials.
References
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Book
Recrystallization and Related Annealing Phenomena
F.J. Humphreys,M. Hatherly +1 more
TL;DR: In this paper, the authors discuss the extent to which we are able to formulate quantitative, physically-based models which can be applied to metal-forming processes, and the subjects treated in this book are all active research areas and form a major part of at least four regular international conference series.
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Journal ArticleDOI
On the theory of the effect of precipitate particles on grain growth in metals
TL;DR: A theoretical model of the energy changes accompanying grain boundary movement has been developed in this paper, which predicts a critical particle size which is dependent on the volume fraction of second phase, the matrix grain size, and the degree of heterogeneity of the matrix.
Journal ArticleDOI
Inhibition of grain growth by second-phase particles
TL;DR: In this paper, the difficulty for a second-phase particle to pinch off when the grain boundary migrates, affects the final grain size, and theoretical models for this effect are discussed.
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