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渗硼温度对Inconel 625的微观组织及磨损性能的研究
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Abstract:
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.
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