Bonding properties and corrosion resistance of TaC-Fe enhanced layer on GCr15 surface prepared by in-situ hot pressing

作者：Zhao, Nana^*; Shan, Rui; Wang, Lehao; Zhou, Yongxin; Cui, Zhen; Liu, Heguang; Yan, Hanqi

来源：Journal of Alloys and Compounds, 2023, 940: 168489.

DOI：10.1016/j.jallcom.2022.168489

• Bearing steel
• Tantalum carbide
• In-situ reaction
• Bond strength
• Corrosion resistance

In this paper, high-hardness and corrosion-resistant TaC-Fe reinforced layer was prepared on GCr15 surface by in-situ hot pressing method using GCr15 and high-purity tantalum plate as raw materials. Phase com-positions, microstructures, nanohardness values, elastic moduli, bonding properties, and corrosion re-sistances of the reinforcement layers were studied by various analytical methods. Results suggested that reinforcement layer prepared by in-situ hot pressing diffusion increased layer thickness as a function of holding time. Layer thicknesses at 1000 celcius temperature, 40 MPa pressure, and holding times of 1, 2, 3, 4, and 5 h were estimated to 6.34 +/- 0.69 pm, 6.92 +/- 0.75 pm, 12.25 +/- 0.68 pm, 12.29 +/- 0.91 pm, and 14.75 +/- 0.89 pm, respectively. The composition was identified as TaC. Nanohardness and elastic modulus of TaC-Fe reinforced layer were measured as 33.93 GPa and 627.51 GPa, respectively. Obtained TaC-Fe re-inforced layer showed good metallurgical bond to GCr15 with bonding force exceeding 100 N. Corrosion rate (CR) of TaC-Fe enhanced layer in electrolyte solution was evaluated as only 19% of that of GCr15 with protection efficiency (Pe) of 81%, useful for protecting substrate GCr15 from deep corrosion. In sum, TaC-Fe enhanced layer possessed good protective effects on GCr15.