熔模铸造高铬铸铁抛丸器叶片耐磨性

以正交试验法研究高铬铸铁抛丸器叶片最佳热处理工艺参数，通过添加微量钒元素及纳米WC/TiC颗粒，改善高铬铸铁件的耐磨性并提高使用寿命，取得了初步的成效。试验结果发现：当淬火保温时间3 h、回火温度450 ℃、回火时间2 h、叶片硬度60 HRC时，耐磨性最好；微量钒元素和纳米WC/TiC颗粒的加入，可细化叶片微观组织，改变碳化物形貌，使叶片耐磨性提高30%。研究结果表明，优化热处理工艺和添加特殊成分可提高高铬叶片的耐磨性，提高综合效益。

Wear resistance of high-Cr cast-iron blade of shot blasting machine with investment casting

The optimal heat-treatment parameters for the high-chromium cast iron blades of shot blasting machine were researched on the basis of the orthogonal experimental design. With the addition of trace elements, vanadium and nano-sized WC/TiC particles, the wear resistance of high-chromium (Cr) cast-iron casting was improved, thus extending its service life. The results indicated that the blades′ hardness was 60 HRC and its best wear resistance was obtained at a quenching soaking time of 3 h while temping at 450 ℃ for 2 h. By adding the trace elements, vanadium and nano-sized WC/TiC particles, the microstructure of the blade was refined, the carbide morphology was changed, and the wear resistence improved by 30%. Results showed that the wear resistance of high-Cr blades can be increased by optimizing the heat-treatment process and the blades′ composition, thereby proving the comprehensive benefit of this study in industrial applications.