Composition Optimization of Nb-Ti Microalloyed High Strength Steel  

作　　者：GAN Xiaolong XU Guang ZHAO Gang ZHOU Mingxing CAll Zhen 甘晓龙;徐光;ZHAO Gang;ZHOU Mingxing;CAI Zhen(The State Key Laboratory of Refractories and Metallurgy,Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,China;Research and Development Center of Wuhan Iron and Steel（Group）Corp,Wuhan 430080,China)

机构地区：[1]The State Key Laboratory of Refractories and Metallurgy,Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,China [2]Research and Development Center of Wuhan Iron and Steel(Group)Corp,Wuhan 430080,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2018年第5期1193-1197,共5页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the Major Projects of Technology Innovation of Hubei Province(No.2017AAA116);the National Natural Science Foundation of China(NSFC)(Nos.51274154,51704217);Hebei Joint Research Fund for Iron and Steel(No.E2018318013)

摘　　要：Four Nb-Ti microalloyed steels were refined and rolled to study the composition optimization of Nb-Ti microalloyed steels. The effects of Nb and Ti on the microstructures, precipitates and properties of Nb-Ti microalloyed steel were investigated. The results showed that an increase in Ti content resulted in the appearance of many fine precipitates leading to a strong precipitation strengthening effect. Hence, the yield strength increased. Besides, the increased strength by the combined increase of Nb and Ti was similar to that observed for the increase in Ti content alone. This increase in strength was attributed widely to the increase in the Ti content alone rather than Nb. Moreover, the increase in Nb content beyond 0.036 wt% exerted no significant effect on the strength of Ti-Nb microalloyed steels, in which more Ti could be added to further improve the strength of steels.Four Nb-Ti microalloyed steels were refined and rolled to study the composition optimization of Nb-Ti microalloyed steels. The effects of Nb and Ti on the microstructures, precipitates and properties of Nb-Ti microalloyed steel were investigated. The results showed that an increase in Ti content resulted in the appearance of many fine precipitates leading to a strong precipitation strengthening effect. Hence, the yield strength increased. Besides, the increased strength by the combined increase of Nb and Ti was similar to that observed for the increase in Ti content alone. This increase in strength was attributed widely to the increase in the Ti content alone rather than Nb. Moreover, the increase in Nb content beyond 0.036 wt% exerted no significant effect on the strength of Ti-Nb microalloyed steels, in which more Ti could be added to further improve the strength of steels.

关 键 词：niobium titanium precipitates properties microalloyed steel 

分 类 号：TG142.1[一般工业技术—材料科学与工程]