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含钒0.45％的一种新型管线用钢的机械性能除受V(CN)沉淀强化影响外,还强烈地取决于钒对相变特性的影响。添加钒能降低贝茵体开始转变温度,这点类似于钼。同时也应看到,尽管钒能提高铁素体开始转变温度,但还能使铁素体转变结束时残留的高碳奥氏体稳定,这个被稳定的奥氏体随后转变成马氏体—贝茵体 (M—B)组织组成物,此种组成物是造成拉力试验时发生连续屈服特性的主要原因。与铁素体同时出现的相间V(CN)沉淀的量强烈地影响着M—B相的体积分
In addition to V (CN) precipitation strengthening, the mechanical properties of a new type of pipeline steel containing 0.45% vanadium is strongly dependent on the effect of vanadium on the phase transition behavior. Adding vanadium can lower the temperature at which bainite begins to change, similar to molybdenum. It should also be noted that while vanadium increases ferrite onset temperature, it also stabilizes the high carbon austenite remaining at the end of the ferrite transformation, and this stabilized austenite is subsequently transformed into martensite- The birch body (M-B) tissue composition, which is the main cause of the continuous yielding behavior during tensile testing. The amount of precipitated V (CN) interphase with ferrite strongly affects the volume fraction of the M-B phase