Effect of annealing and cooling rate on toughness of G115 heat-resistant steels  

作　　者：Zhen Liu Li Gong Chi Zhang Zheng-dong Liu Zheng-zong Chen Yun-he Yu 

机构地区：[1]Key Laboratory for Advanced Materials of Ministry of Education,School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China [2]Institute for Special Steels,China Iron and Steel Research Institute,Beijing 100081,China

出　　处：《Journal of Iron and Steel Research International》2022年第8期1245-1256,共12页

基　　金：supported by the National Natural Science Foundation of China(Grant No.5177io97);the China Postdoctoral Science,Foundation,(Grant_No.035-043201106);the_Tsinghua University Initiative_Scientific Research Program,and the Science Challenge Project(Grant No.TZ2018004).

摘　　要：The effects of annealing before normalizing and different cooling ways, i.e., air cooling, quenching, and water mist cooling after normalizing on the toughness of G115 steels were investigated. The impact tests showed that the annealed samples had better toughness compared to the unannealed samples for three cooling ways. Microstructure observations revealed that the annealed samples had a more uniform grain distribution, smaller size and area fraction of M_(23)C_(6) particles along the grain boundaries, and lower dislocation density than those in the unannealed samples, which performed together for good toughness. Among three cooling ways, air cooling gave the best toughness due to the smallest occupancy of M23C6 particles in the grain boundaries. Thus, the combination of annealing conducted before normalizing and air cooling selected after normalizing can improve the toughness a lot of G115 steels.

关 键 词：G115 steel ANNEALING M_(23)C_(6)particle Dislocation density TOUGHNESS 

分 类 号：TG142[一般工业技术—材料科学与工程]