The hot ductility of V containing high Al, TWIP steels was determined at a 1000°C, when no dynamic recrystallisation occurred, and precipitation was too coarse to influence ductility. A change in grain size from ∼1250 to 500 µm caused the reduction of the area to increase by ∼25%, intimating that the improvement in ductility on adding boron is due to its segregation to the boundaries causing grain refinement on solidification. Fine VC precipitation was mainly responsible for deteriorating ductility. In these steels, the ductility of un-recrystallised austenite decreases gradually with increasing temperature from 700°C to 1000°C and this in combination with fine precipitation can markedly change the shape of the hot ductility curve from ductility decreasing to increasing with temperature.

含 V 高 Al、TWIP 钢的热延展性是在 1000°C 下测定的，此时未发生动态再结晶，且析出物太粗而不会影响延展性。晶粒尺寸从 ~1250 到 500 µm 的变化导致面积减少了 ~25%，暗示添加硼后延展性的改善是由于其偏析到边界导致凝固时晶粒细化。细小的 VC 沉淀是导致延展性恶化的主要原因。在这些钢中，未再结晶奥氏体的延展性随着温度从 700°C 升高到 1000°C 而逐渐降低，这与细小析出相结合可以显着改变热延展性曲线的形状，从延展性随温度降低到随温度升高。