利用温压缩实验,在Gleeble-3500热力模拟试验机上测定了中碳钢马氏体(M)和铁素体+珠光体(F+P)两种组织的流变曲线.对比研究了应变速率对这两种组织流变行为的影响.结果表明:在相同温度下,M组织的应变速率敏感性指数(mM)和加工软化率(sM)都大于F+P组织的相应参数(mF+P)和(sF+P).应变速率为0.001 s-1,变形温度为600℃、650℃、700℃,M组织的流变曲线均低于F+P组织的流变曲线;当应变速率从0.01 s-1增加到10 s-1,M组织和F+P组织的流变曲线相交,交点应变为临界应变,大于临界应变,M组织的流变应力低于F+P.这表明,对降低钢材温轧或零件温挤压的变形应力和成本来说,M组织可能比F+P更好.此外,对导致M组织上述流变行为的机理进行了初步探讨.
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