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以NH3、空气、C3H8与N2混合气体作为气源,采用两段式气体氧-氮-碳三元共渗方法,在580℃加热2 h,随后降温至540℃继续加热1.5 h,实现对S20C钢的表面强化。保持通入气体总流量、空气与C3H8添加比例不变,改变空气与C3H8的总含量,研究不同气氛组成处理后S20C钢表面渗层的厚度、形貌以及相结构变化趋势。结果表明,经过处理后的样品表面形成了具有良好耐摩擦、耐腐蚀性能的亮白色化合物层,该化合物层具有单一ε-Fe2-3(N,C)物相,其厚度随空气与C3H8的总含量的增加而增大。
A mixed gas of NH3, air, C3H8 and N2 was used as the gas source. The two-stage gas oxygen-nitrogen-carbon ternary infiltration method was used to heat at 580 ℃ for 2 h and then cooled to 540 ℃ for 1.5 h. Steel surface strengthened. Maintaining the total flow of the inflow gas, the constant proportion of air and C3H8, changing the total content of air and C3H8, the thickness, morphology and phase structure of the infiltrated layer on the surface of S20C steel under different atmosphere compositions were studied. The results show that a bright white compound layer with good friction and corrosion resistance is formed on the surface of the treated sample. The compound layer has a single ε-Fe2-3 (N, C) phase with thickness varying with air and C3H8 The total content increases.