Precipitation Hardening of Titanium Carbides in Ti Micro-Alloyed Ultra-High Strength Steel

Abstract

New 700MPa hot rolled ultra-high strength steels were successfully developed by using Ti micro-alloying technology in CSP line. Experimental methods, such as OM, TEM and chemical phase analysis, were used to study the experimental steel. The microstructure is composed of quasi-polygonal ferrite grains, whose average grain size is about 4μm. Large number of nanometer TiC particles distribute along dislocations. The mass fraction of MX phase is 0.0793wt%, in which the particles smaller than 10nm account for 33.7%. The contribution of precipitation hardening resulting from nanometer particles is calculated as approximate 158MPa.

Study on the phase transformation law of titanium micro alloyed non-oriented silicon steel

“…A more in-depth understanding of nano-precipitates in titanium micro-alloyed steels has been developed in previous studies [5][6][7][8][9]. Therefore, it is hoped that the titanium micro alloying technology solution will be adopted to achieve the development of high-strength non-oriented silicon steel by controlling the precipitation of titanium carbide nanoparticles based on 50W600.…”

Influence of Microstructure and Precipitates on the Strength of Container Steel

“…The development of container transport to the heavy load, high efficiency, low cost, energy saving and environmental protection, lightweight direction, raised taller requirement on the strength of container steel [1]. One of the effective ways of improving the strength and toughness of steel was adding microalloying elements Nb, V and Ti to steel, combining controlled rolling and controlled cooling technology, and formatting different types, microstructures and sizes of precipitates with the N and C elements [2].…”