Grain growth behavior of coarse-grained austenite in a Nb–V–Ti microalloyed steel

The growth behavior of austenite grain in the heating process of 300M steel

“…Sha and Sun [1] investigated the grain growth behavior of austenite in Nb-V-Ti microalloyed steel, and found that the grains of austenite grow up with the increasing of heating temperature; the Ti-rich carbonitrides assembling in the grain boundaries of austenite restrain the grain growth of austenite at the temperature below 1250 • C. Yu and Sun [2] pointed out that the critical growth temperature of austenite grains in 0.015% Nb steel is 1240 • C; the grains of austenite in 0.015% Nb steel are finer than that in Nb free steel in the range of 1150-1230 • C. The austenite grain size in 16MnNi 4 HSLA steel increases rapidly by heating at 1200 • C for 5-30 min or 1150 • C for 60 min, which was obtained by Fernández et al [3]. Therefore, the major factors affecting the grain size of austenite are the heating temperature, holding time and alloying elements.…”

Effect of Nb Microalloying on Reversion and Grain Growth in a High-Mn 204Cu Austenitic Stainless Steel

“…16) A high pinning force is achieved by a large volume fraction of fine particles. Several authors have studied the effect of microalloying on grain size in carbon steels, [17][18][19][20] but only few deal with austenitic stainless steels, 21,22) especially in the instance of ultrafine grain size. Sawada et al 23) studied the effect of V, Nb and Ti additions on the grain size refinement in type 301L 17Cr-7Ni austenitic stainless steel and demonstrated how microalloying can even lead to submicron grain sizes.…”

Precipitation behaviors of X80 acicular ferrite pipeline steel

“…Ti-rich carbonitrides, which re-precipitated along austenite grain boundaries during the reheating process, may act as a barrier to austenite growth. The effectiveness of pinning particles mainly depends on their ability to resist particle coarsening, particularly at higher temperatures [13]. These fine Nb-rich carbonitrides observed near austenite grain boundaries will not be effective in restricting the grain growth of austenite during reheating.…”