W600无取向硅钢的动态相变对织构和析出相的影响

发布时间：2018-05-24 06:22

  本文选题：无取向硅钢 + 相变　； 参考：《材料热处理学报》2016年01期

【摘要】：测量了W600无取向硅钢(1.35Si-0.25Mn-0.28Al)的静态CCT曲线,根据静态相变点测量了W600的动态CCT曲线。根据动态相变点使用Gleeble3500模拟了实际热轧过程,获得了不同冷速的再结晶组织,使用EBSD技术研究了不同冷却速度下获得的热轧试样的微观织构。使用SEM和EDS观察了W600钢的铸坯以及不同冷速获得试样中的析出物分布情况。实验结果表明:在无取向硅钢的α→γ相变中,冷却速度越低相变温度越高,在动态相变中,当冷却速度为0.75℃/s时,相变开始温度为988℃,相变结束温度为875℃;施加形变也有利于相变温度的提高。热轧模拟实验中,较低的冷却速度有利于获得粗大的再结晶晶粒;随着冷却速度减小,立方织构和γ织构含量上升,旋转立方织构含量下降,其中在冷速为0.25℃/s时,{111}121织构含量达28.5%,{111}100织构含量达32.4%。Al N和Mn S为W600钢中的典型析出物。铸坯中析出Al N析出物和Mn S+Al复合析出物平均尺寸均高于后续热轧模拟试样。热轧模拟实验中,冷速较快时,存在大量细小弥散状的Mn S析出物,Al N存在于Al N+Mn S复合析出物而存在,单独存在的Al N析出较少。当冷速降低时,析出物的总数量减少且尺寸变大,单独存在的Mn S析出物逐渐消失。
[Abstract]:The static CCT curves of W600 non-oriented silicon steel (1.35Si-0.25Mn-0.28Al) were measured, and the dynamic CCT curves of W600 were measured according to the static phase transition points. According to the dynamic phase change point, the actual hot rolling process was simulated by Gleeble3500, and the recrystallization structure at different cooling rates was obtained. The microtexture of hot rolled samples at different cooling rates was studied by EBSD technique. The distribution of precipitates in W600 steel was observed by SEM and EDS. The experimental results show that the lower the cooling rate, the higher the phase transition temperature in the non-oriented silicon steel. In the dynamic phase transformation, when the cooling rate is 0.75 鈩，

本文编号：1928016