Effect of Boronizing Temperature on Microstructure and Wear Properties of Inconel 625

研究了不同的渗硼温度(850℃~980℃)对Inconel 625镍基合金进行渗硼处理。研究表明，随着渗硼温度的增加，渗硼层的厚度会不断增加；当渗硼温度达到980℃时，渗层出现裂缝和孔洞；渗硼层主要由Ni3B和Cr2B等硬质相硼化物组成；在950℃时，合金的表面硬度达到1279.8 HV0.1的峰值，相较于基体263.4 HV0.1得到显著提升；渗硼处理后试样表面摩擦因数和截面磨痕面积显著减小；渗硼层厚度的平方与时间呈线性关系，B原子在Inconel 625渗层中的扩散激活能为227 KJ/mol−1。The boronizing treatment of Inconel 625 nickel-based alloy at different boronizing temperatures (850˚C~980˚C) was studied. The results show that the thickness of boronizing layer increases with the increase of boronizing temperature. When the boriding temperature reaches 980˚C, cracks and voids appear in the boriding layer. The boriding layer is mainly composed of hard phase borides such as Ni3B and Cr2B. At 950˚C, the surface hardness of the alloy reaches a peak of 1279.8 HV0.1, which is significantly improved compared with the matrix of 263.4 HV0.1; after boronizing treatment, the surface friction coefficient and cross-sectional wear scar area of the sample are significantly reduced. The square of the thickness of boronizing layer is linear with time, and the diffusion activation energy of B atom in Inconel 625 boronizing layer is 227 KJ/mol−1.