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

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...

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Bibliographic Details
Published in:Journal of iron and steel research, international international, 2022-08, Vol.29 (8), p.1245-1256
Main Authors: Liu, Zhen, Gong, Li, Zhang, Chi, Liu, Zheng-dong, Chen, Zheng-zong, Yu, Yun-he
Format: Article
Language:English
Subjects:
Applied and Technical Physics
Engineering
Machines
Manufacturing
Materials Engineering
Materials Science
Metallic Materials
Original Paper
Physical Chemistry
Processes
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Summary: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 M 23 C 6 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.
ISSN:1006-706X
2210-3988
DOI:10.1007/s42243-021-00667-2