27SiMn钢空洞型缺陷和组织的演变规律  

Evolvement rule of voids and microstructure of 27SiMn steel

作　　者：文新理[1] 张利冲 梅珍[1] 赵帆[1] 杨勇[1] 刘雅政[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《材料热处理学报》2016年第2期116-121,共6页Transactions of Materials and Heat Treatment

基　　金：中央高校基本科研业务费专项资金(FRF-TP-12-046A);北京高校"青年英才计划"

摘　　要：利用实验室轧制实验研究了不同变形温度和变形量条件下27Si Mn钢空洞型缺陷和组织的演变规律,采用一元非线性函数拟合了空洞平均直径与变形量间的关系,分析了变形温度和变形量对空洞平均直径和组织的影响,利用固态相变热力学和动力学基本原理探讨了变形温度和变形量对组织的影响机理,结果表明：影响空洞闭合的主要变形参数为变形量,变形量与空洞平均直径较好的符合D=9.29＋210.08e-ε/11.78函数关系,随变形温度降低和变形量增加,点链状晶界铁素体（GBF）数量减少而等轴状铁素体数量增加,铁素体体积分数有所提高,组织整体细化,相变驱动力的提高和形核率的增加及其对铁素体相变的诱导作用可很好的解释组织的演变规律,为实现空洞型缺陷和组织均质化集成控制,适宜的变形温度在950℃左右,变形量30%～40%。Rolling experiment was carried out in laboratory in order to research evolvement rule of voids and microstructure of 27SiMn steel, the relationship between deformation amount and voids diameter was fitted by a single variable nonlinear function, the effect and its mechanism of deformation temperature and deformation amount on voids diameter and microstructure were analyzed. The results show that the main factors affecting voids closure is deformation amount, voids diameter is related deformation with a nonlinear function D = 9.29 ＋ 210.08e-ε/11.78 , with the lowering of deformation temperature and increasing of deformation amount, the amount of grain boundary ferrite （GBF） decreases and equiaxed ferrite increases, the fraction of ferrite increases somewhat, microstructure gets finer integrally, the above law can be well interpreted by the improvement of phase transformation driving force and increasing of nucleation rate and its induetion effect on ferrite, in order to integratedly control the voids and microstructure, appropriate deformation temperature is about 950 ℃ and deformation is 30%-40%.

关 键 词：27SIMN钢 空洞型缺陷 演变规律 晶界铁素体(GBF) 

分 类 号：TG335.5[金属学及工艺—金属压力加工]