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材料工程  2010 

ZrC/奥氏体相界面形变诱导铁素体相变超细化机理

, PP. 10-14

Keywords: ZrC粒子,形变诱导铁素体相变,超细晶,机理

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Abstract:

利用Gleeble-1500热模拟试验机进行单轴热压缩实验,研究了含ZrC粒子的低碳钢在形变诱导相变过程中ZrC粒子对铁素体晶粒细化的影响及铁素体形核的基本特性。结果表明一定粒径和体积分数的ZrC粒子弥散分布于基体相中时,能够阻碍位错的运动,形成集中形变区,加速形变诱导相变的进程,因而提高铁素体形核率,导致铁素体晶粒细化;ZrC/奥氏体相界面上形变诱导铁素体相变具有形核位置不饱和性、新生α相超细晶的特点;在应变条件下,铁素体晶粒在〈111〉方向择优取向,晶粒内部存在一定量的小角度晶界,由于铁素体动态再结晶的发生,组织进一步细化。ZrC/奥氏体相界面铁素体晶粒的超细化机理是形变诱导相变、铁素体动态再结晶及ZrC粒子弥散强化三者同时作用的结果。

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