研究了 23-8N 气门钢采用完全时效和固溶 + 时效热处理后的高温摩擦磨损性 能，并对其金相组织、物相组成等进行了分析． 结果表明: 随着温度的升高，两种不同热处 理试样的摩擦系数和磨损体积均呈现出先减小后增大的趋势; 常温下，完全时效处理试样 耐磨性较好，试样表面出现了犁沟和片状磨屑，表现为磨粒磨损和黏着磨损; 而高温时，由 于固溶时效处理试样的表面氧化膜更厚，其耐磨损性能更好; 在 400 ℃时，两种试样表面 被致密的氧化膜覆盖，所以其磨损量最小，该温度下试样的磨损形式以轻微的氧化磨损为 主; 在 500 ～650℃时，随着温度的升高，试样的磨损量逐渐增加，磨损机制也发生转变，由 轻微氧化磨损转变为严重磨粒磨损、黏着磨损和氧化膜的疲劳剥落．

In this paper,the high temperature friction and wear characteristics of 23-8N valve steel after full aging and solid solution aging are investigated,and the microstructure and phase composition of the valve steel are also analyzed.The results show that (1) the friction coefficients and wear loss of two different heat treatment specimens both tend to decrease first and then increase with the rising of temperature; (2) at the room temperature,the full aging specimen has better anti-wear performance,and the surfaces of the two different heat treatment specimens are distributed with grooves and adhesive traces,indicating that the prevailed wear mechanism is abrasive wear and ad- hesive wear; (3) at a high temperature,the solution and aging specimen has better wear resistance due to its thic- ker oxide film; (4) at 400℃,the two specimens are covered with dense oxide films,so the wear loss of the speci- mens is the lowest and the main wear mechanism is mild oxidation wear; and (5) as the temperature rises from 500℃ to 650℃,the wear loss gradually increases,and the predominant wear mechanism transforms from mild oxi- dation wear into severe abrasive wear,adhesive wear and the fatigue delamination of oxide films.