泥浆泵高铬铸铁材料激光淬火技术及其摩擦磨损性能研究

发布时间：2018-05-27 16:21

本文选题：泥浆泵缸套 + 高铬铸铁　；参考：《表面技术》2017年06期

【摘要】：目的提高高铬铸铁的耐磨性能。方法采用CO_2激光器对高铬铸铁工艺试样进行表面激光淬火,利用MMW-1A型摩擦磨损试验机研究激光淬火后试样在磨粒介质条件下的摩擦学性能,并对试样的表面摩擦系数以及磨损率进行测量与分析。结果淬火后试样表层组织被细化,由表及里可分为淬硬区、热影响过渡区和基体区。与基体相比,淬硬层硬度显著提高,最高硬度出现在次表层,可达1105.7HV。当摩擦磨损试验达到稳定状态时,淬火后的试样表面摩擦系数均比未淬火的低,当淬火带间距为1 mm时摩擦系数最小,其值为0.3左右,而未淬火的试样表面摩擦系数高达0.65。相同磨损时间下,激光淬火试样均比未淬火试样的磨损率小,当淬火带间距为1 mm时,磨损率最小,耐磨性最佳。结论激光淬火技术有效地提高了高铬铸铁材料的耐磨性能,延长了泥浆泵缸套的使用寿命。
[Abstract]:Objective to improve the wear resistance of high chromium cast iron. Methods the surface of high chromium cast iron was quenched by CO_2 laser. The tribological properties of laser quenched samples in abrasive medium were studied by MMW-1A friction and wear tester. The surface friction coefficient and wear rate of the sample were measured and analyzed. Results after quenching, the surface microstructure of the sample was refined, which could be divided into hardened zone, heat affected transition zone and matrix zone from surface to interior. Compared with the matrix, the hardness of the hardened layer increased significantly, and the highest hardness appeared in the subsurface layer, reaching 1105.7 HV. When the friction and wear tests reach a stable state, the surface friction coefficient of the quenched specimen is lower than that of the unquenched sample. When the distance between the quenched bands is 1 mm, the friction coefficient is the smallest, about 0.3, and the surface friction coefficient of the unquenched sample is up to 0.65. Under the same wear time, the wear rate of laser quenched specimen is lower than that of unquenched sample. When the distance of quenching band is 1 mm, the wear rate is the least and the wear resistance is the best. Conclusion Laser quenching can effectively improve the wear resistance of high chromium cast iron and prolong the service life of slurry pump cylinder liner.
【作者单位】：江苏大学机械工程学院;
【基金】：国家自然科学基金资助项目(51375211) 江苏省工业支撑项目(BE2014115) 江苏省自然科学基金(BK20130524)~~
【分类号】：TG164

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