Ti-MO低碳超高强钢中相间析出强化  

Interphase precipitation strengthening in ultra-high strength low-carbon Ti-Mo bearing steel

作　　者：汪小培[1,2,3] 赵爱民[1,2] 赵征志[1,2] 黄耀[1,2] 耿志达[1,2] 

机构地区：[1]北京科技大学冶金工程研究院,北京100083 [2]现代交通金属材料与加工技术北京实验室,北京100083 [3]首钢技术研究院薄板研究所,北京100043

出　　处：《北京科技大学学报》2014年第9期1183-1188,共6页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金资助项目(51271035);高等学校博士学科点专项科研基金资助项目(20110006110007)

摘　　要：在不同温度下对Ti-Mo低碳钢进行等温转变,对热轧板进行力学性能检测,利用扫描电镜、透射电镜、选区电子衍射等方法进行组织观察,同时分析了相间析出粒子的形貌、尺寸和分布规律.结果显示,随着等温温度降低,钢的强度提高,延展性降低,屈强比增大.在透射试样中观察到两种不同形态分布的相间析出碳化物:平面型相间析出和曲面型相间析出.相间析出碳化物的平均直径为4.30nm,平均纵横比为1.375.在650℃等温保温1 h时,相间析出强化对铁素体相强度的增量在400MPa以上.The morphology, size and distribution of interphase precipitation particles formed in Ti- Mo-bearing low-carbon steel after isothermal transformation were investigated by scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, and selected area diffraction analysis. The mechanical properties of the hot-rolled plate were also tested. The results show that as the isothermal temperature decreases, the strength and the ratio of yield strength to tensile strength increase, but the ductility decreases. Two different types of interphase precipitation carbides, planar interphase precipitation and curved interphase precipitation, were observed in the TEM specimens. The average diameter of these carbides is 4. 30 nm with an average aspect ratio of 1. 375. Interphase precipitation isothermally treated at 650 ℃ for 1 h can strengthen the ferrite phase by above 400 MPa.

关 键 词：高强钢 低碳钢 相间析出 析出强化 碳化物 力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]