通过在Gleeble 1500热模拟试验机上进行的单轴热压缩实验并结合SEM和EBSD分析技术,研究了共析钢在A1-A(r1)和A1-A(c1)温度范围内的两阶段变形对缓冷组织的影响.结果表明:共析钢在A1-A(r1)温度范围内进行过冷奥氏体形变后,在A1-A(c1)温度范围内再变形时,可以利用应变量控制再奥氏体化进程,在一定应变量下获得奥氏体与未溶渗碳体粒子的混合组织,在随后的缓冷过程中发生离异共析转变,获得超细化(α+θ)复相组织,其中α-Fe平均晶粒尺寸小于3 μm,θ-Fe3C粒子平均尺寸小于0.5μm.
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