Effect of heat treatment process on precipitation of V microalloyed steel

Abstract

Controlled rolling and controlled cooling processes achieve high-strength alloys due to their combined effects on the grain refinement, dispersion, and phase transformations. This paper studies the dissolution of V in austenite by normalizing treatments. The samples were then annealed to form uniform, fine, and dispersed V-based precipitates which in turn facilitated subsequent phase transitions in the steel. The results showed that V fully dissolved into austenite when the steel was treated. Besides, when the steel was annealed, V precipitated in the form of V (C, N), and the V(C, N) precipitates promoted the formation of ferrite. At the same time, fine pearlite phases also formed, and the V(C, N) precipitates were distributed among the pearlite lamellae. The uniformly dispersed V(C, N) precipitates further regulated the microphase organization, refined the grains, and acted as the microalloying element, making the steel more uniform, and improving the mechanical properties of the steel.

Thermomechanical Control of Microstructure and Precipitation in Vanadium Microalloyed Steel: Influence of Finish Rolling and Coiling Temperatures

“…In other words, the addition of vanadium, as a substitute to Nb, to HSLA steels can further reduce the cost of production. Although there are studies on the process parameters of TMCP on V-Nb, V-Ti, Nb-Ti, and V-Nb-Ti microalloyed steels and the effect of vanadium addition on microstructure and mechanical properties of the same, [2,7,14,[21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] there are still a lack of the effects of the FRT and coiling temperature (CT) on the evolution of the microstructures and precipitation behavior of especially V (C, N) in only V microalloyed steel during TMCP. The aim is to understand the relationship between TMCP process, microstructure, and V (C, N) precipitates in V-microalloyed steel and to illustrate the influence of TMCP parameters on nucleation sites of precipitated phase in V-microalloyed steel.…”

The Influences of Nb Microalloying and Grain Refinement Thermal Cycling on Microstructure and Tribological Properties of Armox 500T

“…The most effective methods for enhancing and controlling the final properties of armor steels involve alloying additions, heat treatment, and thermomechanical processing [11,12]. It is widely reported that the grain size of austenite plays a crucial role in improving the hardenability, tensile strength, and toughness properties of steel [13][14][15][16][17][18]. Therefore, obtaining a small prior austenite grain size is essential in manufacturing Armox steel to achieve the desired structures of short lathes and equiaxed martensite after quenching.…”