【摘要】 奥氏体热变形时再结晶规律是制定合理控制轧制工艺的理论基础。采用阶梯试样并通过光学显微镜来观察变形奥氏体的组织形貌 ,测量奥氏体再结晶百分数及晶粒尺寸。研究了道次变形量和变形温度对超低碳贝氏体钢变形奥氏体再结晶百分比影响规律 ,得到实验钢变形奥氏体再结晶图。实验证明试验钢的静态再结晶临界温度 (SRCT)为 95 0℃ ,在SRCT之上进行再结晶轧制 ,并利用随后的析出抑制再结晶和晶粒长大 ;在SRCT之下轧制 ,晶内产生大量的变形带 ,最后可以得到比较细小均匀的晶粒。但在部分再结晶区轧制时容易出现混晶组织恶化钢的性能 ,所以实际变形应该避开部分再结晶区域。更多还原

【Abstract】 Through adopting the stepped test piece, the microstructure morphologies of the deformed austenite were observed, the recrystallization fraction of the austenite and its grain size were measured by optical microscope. The influence of different rolling strain and temperature on the recrystallization fraction of deformed austenite was studied, the deformed austenite recrystallization figure of the test sample was obtained, the static recrystallization temperature (SRCT) of the test steel was 950℃. The grains’ growth and recrystallization were controlled by precipitating after rolling above SRCT; a large number of deformed strips would be created in grains when the rolling was carried under SRCT, fine and homogeneous grains could be obtained finally. If the steel was rolled in partial recrystallization zone, the structure of mixed grain would appear to deteriorate the steel property, so the deformation should avoid from the partial recrystallization zone in reality.更多还原