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"The strengthening due to the presence of Mn, Mo, Nb and V in solution was determined from the yield strengths of these steels. The increment in yield strength over that of the plain C steel was determined as 70% and 7% per 0.1 at.% of Nb and V when each is added singly. The strengthening increased to 80% and 8% respectively for these elements when present jointly in austenite. The strength increments were 9% for Mo and 1.3% for Mn per 0.1 at.% when added to a 0.035% Nb steel. The rank order of these effects is also explained in terms of the electronic and atomic size differences, and a possible reason for the synergistic effect (e.g. in the case of Nb and V in a Nb-V steel) is proposed." --
In response to the demanding requirements of different sectors, such as construction, transportation, energy, manufacturing, and mining, new generations of microalloyed steels are being developed and brought to market. The addition of microalloying elements, such as niobium, vanadium, titanium, boron, and/or molybdenum, has become a key tool in the steel industry to reach economically-viable grades with increasingly higher mechanical strength, toughness, good formability, and weldable products. The challenges that microalloying steel production faces can be solved with a deeper understanding of the effects that these microalloying additions and combinations of them have during the different steps of the steelmaking process.
This book comprehensively reviews the research on Ti microalloyed steel, focusing on development and production technology. It discusses steel composition design and performance, as well as technologies for controlling the microstructure and properties of Ti microalloyed steel during the production process. Ti can significantly improve the properties of steel, but its behavior is more complex and more difficult to control during the production process than that of Nb and V.Covering topics ranging from metallurgy theory to production technology and products, the book serves as a valuable reference resource for researchers, engineers, university teachers and students in the field of steel research.
This book gathers a collection of papers summarizing some of the latest developments in the thermomechanical processing of steels. The replacement of conventional rolling plus post-rolling heat treatments by integrated controlled forming and cooling strategies implies important reductions in energy consumption, increases in productivity and more compact facilities in the steel industry. The metallurgical challenges that this integration implies, though, are relevant and impressive developments that have been achieved over the last 40 years. The frequency of the development of new steel grades and processing technologies devoted to thermomechanically processed products is increasing, and their implementation is being expended to higher value added products and applications. In addition to the metallurgical peculiarities and relationships between chemical composition, process and final properties, the relevance impact of advanced characterization techniques and innovative modelling strategies provides new tools to achieve the further deployment of the TMCP technologies. The contents of the book cover low carbon microalloyed grades, ferritic stainless steels and Fe–Al–Cr alloys, medium-Mn steels, and medium carbon grades. Authors of the chapters of this "Thermomechanical Processing of Steels" book represent some of the most relevant research groups from both the steel industry and academia.
The main aim of the proiect was to develop a new knowledge on the interaction between precipitation and recrystallization on all types of microalloyed steels, from low-carbon HSLA steels slab casted for strip rolling, to medium carbon microalloyed grades bloom or billet casted to be rolled into long products to be finally used for drop forcing of automotive components. Special care has been devoted to the determination of the not yet well known Recrystallization-Preeipitation-Time-Temperature (RPTT) diagrams by different research techniques as hot torsion, hot compression and deformation dilatometry. A detailed quantification of the precipitated particles in different stages has been performed in order to relate their volume fraction, size and composition with austenite microstructure leading to a better understanding of the precipitation-recrystallization interaction. Two main techniques have been used in order to characterise the microprecipitates nature: chemical extraction and TEM analysis (thin foil for the IF steel). From the examinations performed, it has been concluded that the role played by grain boundary precipitation has been strongly underestimated and sorne traditional beliefs about the role of solute drag effect have been discussed. Therefore, it has been suggested that a new model of the precipitation-recrystallization interaction be constructed in a slightly different way. Finally, a model on precipitation kinetics has been constructed in isothermal conditions and converted at cooling rate conditions. This model could be very useful in order to redesign process parameters such as rolling mill deformations or reheating temperatures. To achieve these goals, three steelmakers (Thyssen-Krupp, Ascometal, Sidenor) have joined their interests with a research centre (Cenim) and the University of Pisa.
This is a collection of papers presented at the joint conference of the 7th International Conference on High Strength Low Alloy Steels (HSLA Steels 2015), the International Conference on Microalloying 2015 (Microalloying 2015), and the International Conference on Offshore Engineering Steels 2015 (OES 2015). The papers focus on the exchange of the latest scientific and technological progresses on HSLA steels, microalloying steels, and offshore engineering steels over the past decades. The contributions are intended to strengthen cooperation between universities and research institutes, and iron and steel companies and users, and promote the further development in the fields all over the world.
This volume contains 27 papers covering the advances being made in the field of accelerated cooling technology for hot-rolled steel products. Main topics covered include accelerated cooling applications to plate, strip, bars and shapes; system design; process modelling and effects on transformation; microstucture and mechanical properties, providing international steel industry R & D personnel and metallurgical research groups with a state-of-the-art update of this rapidly developing technology.