渗硼温度对Inconel 625合金渗硼层组织及耐磨性的影响

Effect of boronizing temperature on microstructure and wear resistance of boronized layer of Inconel 625 alloy

采用固体颗粒渗硼技术对Inconel 625合金进行表面处理,研究了不同渗硼温度对渗硼层组织结构、相成分、硬度和耐磨性能的影响。结果表明:Inconel 625镍基合金在900℃渗硼处理后,渗层主要由镍硼化合物相和少量铬硼化合物相组成,试样表面硬度增大,耐磨性能提高。950℃渗硼后的渗层由镍硼相和铬硼相组成,表面硬度达到最大值1239.1 HV0.3,耐磨性能最好。1000℃渗硼后试样在镍硼相和铬硼相的外侧生成硅化物Si31 Ni12,造成表面硬度下降,耐磨性能变差。综合比较,渗硼温度在950℃时,Inconel 625镍基合金试样的表面硬度最高,耐磨性能最优。

Surface modification on Inconel 625 alloy was carried out by means of solid particle boronizing technology.Effects of boronizing temperature on the microstructure,phase composition,hardness and wear resistance of the boronized layer were studied.The results show that the boronized layer is mainly composed of nickel-boron phase and a little chromium-boron compound when the Inconel 625 nickel-based alloy is boronized at 900℃.Both the surface hardness and wear resistance of the Inconel 625 alloy are improved after boronizing.When boronized at 950℃,the boronized layer is composed of nickel boron phase and chromium boron phase,and the surface hardness reaches the maximum of 1239.1 HV0.3,and the wear resistance is the best.When boronized at 1000℃,the formation of silicide Si31Ni12 on the outside of nickel boron phase and chromium boron phase results in the decrease of surface hardness and poor wear resistance.It is concluded that when the boronizing temperature is 950℃,the Inconel 625 alloy specimen has the highest surface hardness and possesses the best wear resistance.