The precipitation and effect of nano nitrides in HSLC steel

作     者：FU Jie1, LIU YangChun1,2 & WU HuaJie1,3 1 School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China 2 Shougang Technology Research Institute, Shougang (Group) Corporation, Beijing 100041, China 3 Metallurgical Engineering Research Institute, University of Science and Technology Beijing, Beijing 100083, China 

作者机构：School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing China Shougang Technology Research Institute Shougang (Group) Corporation Beijing China Metallurgical Engineering Research Institute University of Science and Technology Beijing Beijing China 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2008年第51卷第7期

页      面：989-998页

核心收录：

学科分类：0810[工学-信息与通信工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0702[理学-物理学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：the National Natural Science Foundation of China (Grant No. 50334010) the State Foundation for Key Projects: New Generation of Steels (Grant No. G1998061500) 

主　　题：thin slab casting and rolling high strength low carbon steel AlN nano nitride precipitation strengthening 

摘      要：The existing forms of N and Al in HSLC (high strength low carbon) steel produced by TSCR (thin slab casting and rolling process), the precipitation thermodynamics and kinetics of AlN, and its effects on structure and mechanical property are studied. The experimental results show that only a small quantity of nitrogen is com- bined into AlN in HSLC steel produced by TSCR and most of the nitrogen in steel is still free nitrogen. Aluminum-nitride is mainly precipitated during the period of slow air cooling after coiling, but not during rolling and water cooling. The acid-soluble aluminum has no obvious effect on the grain size and mechanical property of HSLC steel produced by TSCR whose acid-soluble aluminum content is 0.005%―0.043%. The precipitation of AlN is not the main cause of grain refinement of HSLC steel produced by TSCR, nor is AlN the dominating precipitate that has precipitation strengthening effect. The nano nitrides are not pure AlN, but have complex compositions.