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Composite Fe-Cr-V-C Coatings Prepared by Plasma Transferred-Arc Powder Surfacing
Xin Zhang1, Yong Liu1, Huichao Cheng1
1State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China.
Materials (Basel, Switzerland)
|July 29, 2023
Summary
This study created strong Fe-Cr-V-C coatings on steel using plasma transferred-arc surfacing. The resulting coatings exhibit exceptional hardness and robust metallurgical bonding, enhancing material performance.
Area of Science:
- Materials Science
- Surface Engineering
- Metallurgy
Background:
- Advanced coatings are crucial for improving the durability and performance of steel components.
- Plasma transferred-arc (PTA) surfacing is a key additive manufacturing technique for creating high-performance surface layers.
- Understanding the influence of process parameters on coating properties is essential for optimizing material applications.
Purpose of the Study:
- To develop novel composite Fe-Cr-V-C coatings utilizing PTA powder surfacing.
- To investigate the impact of arc current and ion gas flow rate on coating characteristics.
- To evaluate the microstructural evolution, hardness, and bonding strength of the developed coatings on a 42CrMo steel substrate.
Main Methods:
- Composite Fe-Cr-V-C coatings were fabricated on a 42CrMo steel substrate via PTA powder surfacing.
- The effects of varying arc current and ion gas flow rate were systematically studied.
- Microstructural analysis, hardness testing (HRC), and tensile strength measurements were employed to characterize the coatings.
Main Results:
- In-situ formation and uniform distribution of hard phases (e.g., VxCy, M7C3) within the Fe matrix were observed.
- Precipitation and dispersion strengthening mechanisms contributed to high surface hardness, reaching up to 64.1 HRC.
- Strong metallurgical bonds were achieved, with tensile strengths exceeding 811 MPa, indicating excellent substrate-coating adhesion.
Conclusions:
- PTA powder surfacing is an effective method for producing high-hardness, high-strength Fe-Cr-V-C composite coatings.
- Optimized process parameters lead to superior microstructural properties and enhanced bonding performance.
- These advanced coatings offer significant potential for wear-resistant and high-performance applications in demanding environments.
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