Effect of Boron Additions on the Microstructural Evolution and Properties of Fe-Mo-Cu-Ni-C Sintered Steel
Abstract
:1. Introduction
2. Methods
3. Results and Discussion
3.1. Sintering Technology and Densities
3.2. Microstructural Characteristics of the Sintered Steels
3.3. Mechanical Properties
3.4. Wear Behavior and Mechanism
4. Conclusions
- (1)
- The microstructures of the sintered steels with and without the B additions consisted of pearlite, ferrite, Ni-rich austenite, Cu-rich pearlite, and pores; however, as the B content increased, the ferrite phase became smaller and even disappeared, and Ni and Cu elements became more homogeneous. After the heat treatment, the microstructure of the steels mainly consisted of martensite. The pores became rounder and the number of pores decreased and disappeared with an increasing B content.
- (2)
- The C16-type Mo2B structures with the space group of I4/mcm were identified by transmission electron microscope (TEM) observation, and the equilibrium phase diagram calculation indicated that the B addition facilitated the formation of the M2B phase.
- (3)
- The sintering density of the PM steels increased as the B content increased, and the hardness of the materials monotonously increased. The ultimate tensile strength of the heat-treated steels attained a maximum value of 1097 MPa with a B content of 0.2% and the IM of the steels attained a maximum value of 25.7 J/cm2 with a B content of 0.1%.
- (4)
- The wear resistance of the steels initially increased and then decreased with an increasing B content. Under low load conditions, the 0.2% B steel exhibited excellent wear resistance due to the combination of good hardness and tensile strength, and the failure mode of the steel was mainly adhesion/triboxidation. Under high load conditions, the 0.1% B steel exhibited excellent wear resistance due to the combination of good hardness, strength, and excellent toughness, and the failure mode of the steel was abrasion wear, triboxidation, and adhesive wear.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Fe | Cu | Ni | C | Si | Mn | P | S | Mo | O |
---|---|---|---|---|---|---|---|---|---|
Bal. | 1.45~1.52 | 1.70~1.75 | ≤0.015 | ≤0.10 | ≤0.35 | ≤0.016 | ≤0.025 | 0.45~0.50 | ≤0.25 |
Specimens | Fe | Mo | Cu | Ni | B | C | Wax |
---|---|---|---|---|---|---|---|
1# | Bal. | 0.5 | 1.5 | 1.75 | 0 | 0.7 | 0.7 |
2# | Bal. | 0.5 | 1.5 | 1.75 | 0.1 | 0.7 | 0.7 |
3# | Bal. | 0.5 | 1.5 | 1.75 | 0.2 | 0.7 | 0.7 |
4# | Bal. | 0.5 | 1.5 | 1.75 | 0.3 | 0.7 | 0.7 |
5# | Bal. | 0.5 | 1.5 | 1.75 | 0.4 | 0.7 | 0.7 |
6# | Bal. | 0.5 | 1.5 | 1.75 | 0.5 | 0.7 | 0.7 |
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Liu, Z.; Wang, Y.; Yuan, Y.; Luo, F.; Wang, T.; Han, W.; Tan, L. Effect of Boron Additions on the Microstructural Evolution and Properties of Fe-Mo-Cu-Ni-C Sintered Steel. Materials 2023, 16, 6953. https://doi.org/10.3390/ma16216953
Liu Z, Wang Y, Yuan Y, Luo F, Wang T, Han W, Tan L. Effect of Boron Additions on the Microstructural Evolution and Properties of Fe-Mo-Cu-Ni-C Sintered Steel. Materials. 2023; 16(21):6953. https://doi.org/10.3390/ma16216953
Chicago/Turabian StyleLiu, Zenglin, Yankang Wang, Yong Yuan, Fenghua Luo, Tao Wang, Wei Han, and Liming Tan. 2023. "Effect of Boron Additions on the Microstructural Evolution and Properties of Fe-Mo-Cu-Ni-C Sintered Steel" Materials 16, no. 21: 6953. https://doi.org/10.3390/ma16216953