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采用Gleeble-1500D型热模拟试验机研究了高性能海底管线用钢的铁素体相变组织演变特征,观察不同变形温度、变形量和开冷温度对铁素体相变规律的影响。结果表明,增加变形量和降低变形温度均会促进形变诱导铁素体相变,加快铁素体析出,细化铁素体晶粒;降低开冷温度,铁素体转变量增加,但开冷温度过低时,铁素体晶粒会明显长大。为了获得细小弥散的铁素体组织,试验钢奥氏体未再结晶区变形温度应控制在780℃左右,变形量≥50%,开冷温度控制在700~660℃之间。
The evolution of ferrite transformation microstructure in high performance submarine pipeline steel was investigated by Gleeble-1500D thermal simulation test machine. The effects of different deformation temperature, deformation and cooling temperature on the ferrite transformation were observed. The results show that both increasing the deformation and decreasing the deformation temperature will promote the deformation-induced ferrite transformation, accelerate the precipitation of ferrite and refine the ferrite grains. When the opening temperature is decreased, the ferrite transformation amount increases, When the temperature is too low, the ferrite grains will obviously grow up. In order to obtain fine and dispersed ferrite, the deformation temperature of austenite non-recrystallization zone in test steel should be controlled at about 780 ℃, deformation ≥50%, and the cooling temperature controlled at 700 ~ 660 ℃.