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Article

The Evolution of a Microstructure during Tempering and Its Influence on the Mechanical Properties of AerMet 100 Steel

by
Hongli Wang
1,2,3,
Jian Zhang
2,3,
Jingtao Huang
1,
Chengchuan Wu
2,3,
Xianguang Zhang
4,
Zhonghong Lai
5,
Yong Liu
1,* and
Jingchuan Zhu
1,*
1
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150006, China
2
Chengdu Advanced Metal Materials Industrial Technology Institute Co., Ltd., Chengdu 610300, China
3
State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan 114009, China
4
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
5
Center for Analysis, Measurement and Computing, Harbin Institute of Technology, Harbin 150001, China
*
Authors to whom correspondence should be addressed.
Materials 2023, 16(21), 6907; https://doi.org/10.3390/ma16216907
Submission received: 23 September 2023 / Revised: 20 October 2023 / Accepted: 23 October 2023 / Published: 27 October 2023
(This article belongs to the Special Issue Microstructure, Mechanical Properties and Wear Performance of High-Strength Steels)
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Abstract

In order to provide guidance for furthering the balance of strength and toughness of AerMet 100 steel through tempering treatment, the effects of the tempering time on microstructure and mechanical properties are investigated. The microstructure evolution, especially M2C precipitates and austenite in AerMet 100 tempered at 482 °C for 1~20 h, was characterized, and its influences on the mechanical properties were studied. The tensile strength decreases gradually, the yield strength increases first and then decreases, and the fracture toughness KIC increases gradually with an increasing tempering time. The strength and toughness matching of AerMet 100 steel is achieved by tempering at 482 °C for 5~7 h. Without considering the martensitic size effect, the influence of the dislocation density on the tensile strength is more significant during tempering at 482 °C. The precipitation strengthening mechanism plays a dominant role in the yield strength when tempering for 5 h or less, and the combined influence of carbide coarsening and a sharp decrease in the dislocation density resulted in a significant decrease in tensile strength when tempering for 8 h or more. The fracture toughness KIC is primarily influenced by the reverted austenite, so that KIC increases gradually with the prolongation of the tempering time. However, a significant decrease in the dislocation density resulting from long-term tempering has a certain impact on KIC, giving rise to a decrease in the rising amplitude in KIC after tempering for 8 h or more.
Keywords: carbide; reverted austenite; AerMet 100 steel; KIC; strength carbide; reverted austenite; AerMet 100 steel; KIC; strength

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MDPI and ACS Style

Wang, H.; Zhang, J.; Huang, J.; Wu, C.; Zhang, X.; Lai, Z.; Liu, Y.; Zhu, J. The Evolution of a Microstructure during Tempering and Its Influence on the Mechanical Properties of AerMet 100 Steel. Materials 2023, 16, 6907. https://doi.org/10.3390/ma16216907

AMA Style

Wang H, Zhang J, Huang J, Wu C, Zhang X, Lai Z, Liu Y, Zhu J. The Evolution of a Microstructure during Tempering and Its Influence on the Mechanical Properties of AerMet 100 Steel. Materials. 2023; 16(21):6907. https://doi.org/10.3390/ma16216907

Chicago/Turabian Style

Wang, Hongli, Jian Zhang, Jingtao Huang, Chengchuan Wu, Xianguang Zhang, Zhonghong Lai, Yong Liu, and Jingchuan Zhu. 2023. "The Evolution of a Microstructure during Tempering and Its Influence on the Mechanical Properties of AerMet 100 Steel" Materials 16, no. 21: 6907. https://doi.org/10.3390/ma16216907

APA Style

Wang, H., Zhang, J., Huang, J., Wu, C., Zhang, X., Lai, Z., Liu, Y., & Zhu, J. (2023). The Evolution of a Microstructure during Tempering and Its Influence on the Mechanical Properties of AerMet 100 Steel. Materials, 16(21), 6907. https://doi.org/10.3390/ma16216907

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