Abstract
Low-carbon Ti-Mo microalloyed steels represent a new generation of high strength steels for automobile sheet. Excellent indicators of difficult-to-combine technological, strength, and other service properties are achieved due to the superposition of a dispersed ferrite matrix and a bulk system of nanoscale carbide precipitates. Recently, developments are underway to optimize thermo-deformation processing for the most efficient use of phase precipitates. The review summarizes and analyzes the results of studies of mechanical properties depending on the chemical composition and parameters of hot deformation of low-carbon Ti-Mo microalloyed steels. Particular attention is paid to the features of the formation and the influence of various types of phase precipitates and the dispersion of the microstructure on mechanical properties. The advantages of Ti-Mo microalloying system and the tasks requiring further solution are shown.
Highlights
At present, one of the areas with the highest priority in the development of world science and technology, is the problem of creating a new generation of various types of structural steels with a fundamentally improved complex of difficult-to-combine indicators of strength, ductility, formability, corrosion resistance, operational reliability, and other service properties, while reducing production costs
The results showed that with decreasing temperature of rolling (Tf) both the ferrite grain size and the volume fraction of carbide precipitates decreased, but the size of carbide precipitates changed little
The review of studies of low-carbon Ti-Mo microalloyed steels shows the prospects of developments aimed at creating steels of this type with a high complex of technological, mechanical, and other service properties based on the formation of a dispersed structure of acicular ferrite and control of the type, amount and dispersion of carbide precipitates
Summary
One of the areas with the highest priority in the development of world science and technology, is the problem of creating a new generation of various types of structural steels (first of all, for automobile sheets, pipes) with a fundamentally improved complex of difficult-to-combine indicators of strength, ductility, formability, corrosion resistance, operational reliability, and other service properties, while reducing production costs. In contrast to the available reviews, including [2,3,4,5], this article is devoted to low-carbon Ti-Mo microalloyed steels In this case, special attention is paid to the results of studies of the conditions for the formation of a structural state, including a microstructure and different types of phase precipitates, and, as a result, its effect on mechanical properties depending on the chemical composition and parameters of hot deformation. The formation of fine grains of ferrite in a number of microalloyed high-strength steels is the result of the formation of ferrite from unrecrystal-
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