低碳钢中纳米尺寸碳化物的相间析出行为  

Interphase precipitation behavior of nano-sized carbides in low carbon steel

作　　者：黄耀[1,2,3] 赵爱民[2,3] 程永峰[1] 汪小培[2,3] 杨靖波[1] 刘华清[1] 

机构地区：[1]中国电力科学研究院,北京100192 [2]北京科技大学冶金工程研究院,北京100083 [3]现代交通金属材料与加工技术北京实验室,北京100083

出　　处：《工程科学学报》2015年第7期896-904,共9页Chinese Journal of Engineering

基　　金：国家自然科学基金资助项目(51271035);中国高校博士点专项基金资助项目(20110006110007)

摘　　要：采用扫描电镜和透射电子显微镜对低碳Ti-Mo系的热轧板进行了组织分析,同时对其中的纳米粒子析出行为进行了研究.强化机理分析表明析出强化对于屈服强度的贡献值可达291 MPa.随着卷取温度的降低,纳米粒子相间析出的排间距会减小,相间析出的排间距与其在铁素体中形核点位置有一定的离散值,但基本上呈一定的固定值.α/γ界面的观察和采用不同理论的计算结果表明相间析出的产生主要与α/γ界面的台阶形成有关,相间析出的排间距大小由台阶高度、晶界扩散系数、等温温度、台阶面迁移速率等决定.The microstructures of hot rolled Ti- Mo-bearing low-carbon steel and its precipitation characterization of nano-sized carbides were studied by scanning electron microscopy and transmission electron microscopy. It is shown that precipitation strengthening due to nano-sized carbides is estimated to be approximately 291 MPa. The row spacing of interphase precipitation decreases with the drop of isothermal holding temperature. Though the row spacing of interphase precipitation in ferrite shows a relatively small scatter,it tends to be almost constant against distance from the center of ferrite transformed at different holding temperatures. The observedα /γ interfacial microstructure and interphase precipitation simulation by different theories indicate that this interphase precipitation has a close relationship with the formation of mobile ledges,and the row spacing of interphase precipitation is determined by factors such as ledge height,boundary diffusion coefficient,holding temperature,and ledge velocity.

关 键 词：低碳钢 碳化物 纳米颗粒 析出行为 

分 类 号：TG142.31[一般工业技术—材料科学与工程] TG335.5[金属学及工艺—金属材料]