稀土元素Ce对TWIP钢低周疲劳行为的影响  

Effect of Ce on low cycle fatigue behavior of TWIP steel

作　　者：米振莉[1] 吴海鹏[1] 吴彦欣[1] 江海涛[1] 

机构地区：[1]北京科技大学冶金工程研究院,北京100083

出　　处：《钢铁研究学报》2015年第11期48-53,共6页Journal of Iron and Steel Research

摘　　要：研究了添加不同含量稀土元素Ce的Fe-Mn-C系TWIP钢的低周疲劳行为。低周疲劳测试采用总应变幅±0.8%范围内循环加载方式进行,随后利用扫描电镜及透射电镜等手段,观察了TWIP钢在低周单轴循环对称拉压载荷下的疲劳断裂后的显微组织。结果表明,添加稀土元素Ce的TWIP钢与原TWIP钢均表现出循环硬化、循环饱和、循环软化、最后失效的特性趋势;然而稀土元素Ce的添加,给TWIP钢引入了更多的夹杂物,降低了TWIP钢的疲劳吸能能力,对TWIP钢的疲劳变形起到了不利的作用。The low cycle fatigue behaviors of Fe-Mn-C TWIP steels with different Ce contents were studied. The research was done with a total strain amplitude of ± 0. 8% during cyclic loading. Microstructure evolutions of TWlP steels after fatigue fracture were observed by SEM and TEM. The experimental results indicate that TWlP steels with Ce and without Ce have the same characteristics of cyclic hardening, cyclic saturating, cyclic softening and final failure. The density of inclusions in the TWIP steel is increased by the addition of rare earth element Ce, which results in the absorption capability of fatigue energy of the TWlP steel is reduced. Therefore, Ce plays a negative role in deformation fatigue of TWlP steel.

关 键 词：CE TWIP钢 低周疲劳行为 孪晶 

分 类 号：TG142.1[一般工业技术—材料科学与工程]