Effect of Quenching, Lamellarizing, and Tempering on Reversed Austenite and Cryogenic Toughness of 9Ni Steels

• Published in: Journal of materials engineering and performance Vol. 33; no. 5; pp. 2349 - 2357
• Main Authors: Zhang, Hongliang, Hou, Jiaping, Zhang, Dazheng, Li, Weijuan, Xu, Jiakai, Pang, Qihang, Zhu, Qingyan, Zhang, Junkai
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.03.2024
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Corrosion and Coatings; Engineering Design; Materials Science; Quality Control; Reliability; Safety and Risk; Technical Article; Tribology; quenching, lamellarizing, and tempering; 9Ni steel; internal friction; cryogenic toughness; reversed austenite
• ISSN: 1059-9495; 1544-1024
• DOI: 10.1007/s11665-023-08129-4

Herein, the effects of quenching, lamellarizing, and tempering (QLT) on reversed austenite and cryogenic toughness of 9Ni steels were investigated in terms of microstructure characterization, internal friction tests, and low temperature impact tests. The results showed that QLT treatment not only refined the grain effectively, but also promoted the formation of reversed austenite, thus obtaining excellent ultra-cryogenic toughness. Furthermore, QLT treatment promoted the redistribution of C, Mn, and Ni elements, so that more stable austenite was retained to room temperature. The phase transformation peak in the internal friction peak confirmed that QLT treatment effectively promoted the formation of reversed austenite, while the Snoek–Kê–Köster peak showed a strong interaction between carbon atoms and dislocations. Due to the synergistic effect of fine grain toughening and TRIP effect, the 9Ni steel treated by QLT appeared more excellent ultra-cryogenic toughness.Please check and confirm the corresponding author mail id is correctly identified.The corresponding author mail id is correct.