氮对含铈A517Gr.Q钢组织及性能影响  

Effect of N on the Microstructure and Properties of A517Gr.Q Containing Ce

作　　者：任磊 张泽宁 杨吉春[1] 富晓阳[1] 刘香军[1] 王军[1] 张芳[1] REN Lei;ZHANG Ze-ning;YANG Ji-chun;FU Xiao-yang;LIU Xiang-jun;WANG Jun;ZHANG Fang(School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010

出　　处：《稀土》2022年第5期109-115,共7页Chinese Rare Earths

基　　金：国家自然科学基金项目(51804171,51864041,51774190)。

摘　　要：首先利用Thermo-Calc软件计算了含氮、铈高强度海洋平台用钢A517Gr.Q析出相的理论组成,其次研究了氮对含铈实验钢组织及性能的优化效果。结果表明,含氮实验钢中有大量弥散分布的Nb(C,N),在实验钢中Ce和Nb、V、C、N发生交互作用,钉扎在奥氏体晶界,在奥氏体向铁素体转变时这些析出相可以阻止铁素体晶粒长大,使得相变后的组织细化,从而可以得到晶粒细小而均匀的组织,并最终使得实验钢的强度和韧性提高。经测试,增氮后的实验钢抗拉强度提升了15.2%,屈服强度提升了18.1%,冲击吸收功提升了6.9%。In this paper, Thermo-Calc software was used to calculate the theoretical composition of the precipitated phase of steel A517 Gr.Q for high strength platform with nitrogen and cerium, and then the optimization effect of nitrogen on the microstructure and properties of experimental steel with cerium was studied. Results show that the experimental steel has a large dispersion of Nb(C, N), interaction between Ce and Nb, V, C, N, and pinning in austenite grain boundary are observed. In transformation of austenite to ferrite, the precipitated phase can prevent ferrite grain growth, make the organization refined after transformation, so as to be able to get fine grain and homogeneous tissue, and eventually increase the strength and toughness of the experimental steel. The tensile strength, yield strength and impact absorption work of the nitrogen-enriched steel were increased by 15.2%, 18.1% and 6.9% respectively.

关 键 词：氮元素 CE A517Gr.Q 显微组织及性能 

分 类 号：TF03*1[冶金工程—冶金物理化学]