The Influence of Small Additions of Alloying Elements on the Hot Ductility of AHSS Steels: A Critical Review Part 2

Abstract

In this paper, the influence of small additions of Cr, Mo, Cu, Ni, B, Ca, Zr, and Ce on the hot ductility of advanced high-strength steels (AHSS) has been reviewed. Most of these small additions have a positive effect in improving hot ductility on straightening during continuous casting operations and should be considered when problems with cracking in continuous casting are encountered. In many of these cases, the reason for these generally small but important improvements in hot ductility is not known with certainty, but the segregation of these elements to the austenite grain boundaries, strengthening the bonding, is often suggested.

Hot Ductility, Homogeneity of the Composition, Structure, and Properties of High-Strength Microalloyed Steels: A Critical Review

“…Nb Negative [31] Nb, Nb-Ti, Nb-V [32,33] Ti-Mo [33] Hot ductility Nb Depends on size [34][35][36] Ti, Nb-Ti [37][38][39][40] V, Nb-V [41][42][43][44] This review presents a critical analysis of the data on the effect of precipitates of excess phases on the hot ductility and homogeneity of the chemical composition and microstructure of low-carbon microalloyed steels. In recent decades, considerable experience has been accumulated in ensuring a sufficient level of the hot ductility of steels, which is periodically systematized and summarized in the corresponding reviews [34,35,45,46]. Nevertheless, the technologies of metallurgical production are developing, the requirements for the properties of metallurgical products are increasing, and, therefore, studies of the factors affecting hot ductility are continuing and focusing on specific classes of steels.…”

“…Nevertheless, the technologies of metallurgical production are developing, the requirements for the properties of metallurgical products are increasing, and, therefore, studies of the factors affecting hot ductility are continuing and focusing on specific classes of steels. Reviews have recently been published on studies on the hot ductility of twinning-induced plasticity (TWIP) and transformation-induced plasticity (TRIP) steels [35,47]. However, high-strength microalloyed steels continue to occupy a leading position in terms of production and consumption.…”