Journal ArticleDOI
Effect of starting microstructure on austenite grain sizes developed after reheating of HSLA steel
Somnath C. Roy,Anish Karmakar,Subrata Mukherjee,Saurabh Kundu,Dinesh Srivastava,Debalay Chakrabarti +5 more
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TLDR
In this paper, mixed (or bimodal) austenite grain structures were developed as a result of abnormal grain growth at different soaking temperatures in as cast slab (∼1200°C) and in rolled plates ( ∼1000°C).Abstract:
Austenite grain structure has been studied over a wide range of soaking temperatures (950–1250°C) in a high strength low alloy steel containing Nb, Ti and V for different starting conditions, namely as cast, hot rolled and thermomechanical controlled rolled. Mixed (or bimodal) austenite grain structures were developed as a result of abnormal grain growth at different soaking temperatures in as cast slab (∼1200°C) and in rolled plates (∼1000°C), which has hardly been reported earlier. Higher fraction of finer precipitates, such as NbC and VC (<200 nm in size), were present in the rolled plate as compared to as cast slab, where the precipitates were coarser and complex in nature. Rapid dissolution of fine VC precipitates was primarily responsible for the observed abnormal grain growth in rolled plates at lower soaking temperature (∼1000°C). Coarse precipitates of complex nature, such as (Nb,Ti,V)(C,N) and (Nb,Ti)(C,N), remained stable up to ∼1150°C and restricted the formation of abnormal grain grow...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 Effect of Precipitate Evolution on Austenite Grain Growth in RAFM Steel.
Biyu Yan,Yongchang Liu,Yongchang Liu,Zejun Wang,Chenxi Liu,Yonghong Si,Huijun Li,Jianxing Yu,Jianxing Yu +8 more
TL;DR: It was found that the coarsening and dissolution of M23C6 and MX precipitates leads to a decrease in pinning pressure on grain boundaries, facilitating the rapid growth of austenite grains.
Journal ArticleDOI
Understanding the Effect of Aluminum Addition on the Forming of Second Phase Particles on Grain Growth of Micro-Alloyed Steel
TL;DR: In this paper, the role of nitrogen on forming nitride particles either with aluminum or titanium was found in the steel matrix during melting and casting, which plays an important role in controlling the grain size of steel.
Journal ArticleDOI
Segregations in Steels during Heat Treatment – A Consideration along the Process Chain
Journal ArticleDOI
Grain Size Evolution and Mechanical Properties of Nb, V–Nb, and Ti–Nb Boron Type S1100QL Steels
TL;DR: In this article, three microalloying systems with minor additions were tested, two without any titanium addition, to evaluate grain size evolution and mechanical properties with pre-defined as-cast, hot forging, hot rolling, and off-line heat treatment strategy to meet demands for S1100QL steel.
References
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Journal ArticleDOI
The kinetics of precipitation from supersaturated solid solutions
I.M. Lifshitz,V.V. Slyozov +1 more
TL;DR: In this paper, an analysis is made of the process whereby diffusion effects can cause the precipitation of grains of a second phase in a supersaturated solid solution, and the kinetics of this type of grain growth are examined in detail.
Book
The Physical Metallurgy of Microalloyed Steels
TL;DR: In this article, the authors provide a substantial background to microalloyed steels with a wide selection of applications, some of which are very recent, and a well-illustrated practical guide.
Journal ArticleDOI
Phase Transformations in Metals and Alloys
G. Meyrick,G. W. Powell +1 more
TL;DR: In this paper, the authors present a review of phase transformations and their consequences with the complexities that render it so intriguing, including morphological and mechanistic properties, as well as a discussion of spinodal decomposition.
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.