利用自行开发设计的高温凝固相转变测定装置,研究了DP590钢在不同冷速下的高温凝固相转变过程,得到了凝固过程中液相(L)到高温铁素体(δ)再到奥氏体(γ)的相变温度,并绘制了该钢的凝固相转变(SPT)曲线.结果表明:当冷速为0.006℃·s-1时,该钢δ相转变开始温度在1 520~1 535℃之间,结束温度在1 490℃左右;冷速增至0.33℃·s-1时,δ相转变开始温度降至1 510~1 520℃之间,结束温度在1 480~1 490℃之间;γ相转变开始温度为1 460℃之上,结束温度在1 435℃以下;随着冷速的增大,相转变模式会发生变化,相图会向下移动,各相变反应的温度区间减小.
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