【作者】 鲍崇高； 邢建东； 高义民； 张国赏；

【Author】 BAO Chong-gao, XING Jian-dong, GAO Yi-min, ZHANG Guo-shang (School of mechanical Engineering, Xi’an Jiaotong University, Xi’an, 710049)

【机构】 西安交通大学机械工程学院；

【摘要】 以0Cr13Ni5Mo不锈钢为对比材料,考察了高速含沙水流中铸态28Cr高铬铸铁材料的抗冲蚀磨损性能, 并进行了试验材料的宏观和微观失效机理分析。结果表明:试验材料的冲蚀失质量损失随试验时间的增加星线性增加;在45m／s和34m／s冲蚀速度下,28Cr高铬铸铁抗冲蚀性能分别是0Cr13Ni5Mo不锈钢的5．5倍和6．1倍; 这是因为前者的硬质相碳化物的硬度远高于后者组织中的马氏体,发挥了优越的抗磨削作用,同时保护了基体, 奥氏体基体的弹塑性好,也减缓了沙粒冲刷表面时的材料流失;2种试验材料的宏观和微观失效形貌也有明显的区别。更多还原

【Abstract】 The main failure mechanism of turbine parts is the erosive wear action of sand water on the surface of metal material. The erosive wear resistance of 28Cr iron as-cast was investigated and compared with that of 0Cr13Ni5Mo stainless steel in sand water at high velocity, and the failure mechanism of the test material was analyzed. The results showed that the weight losses ot the tested materials linearly increased with the increase in test time. The erosive wear resistance of 28Cr iron was 5.5 times as high as that of 0Cr13Ni5Mo stainless steel at the erosive velocity 45m/s, and 6.1 times at 34m/s. The excellent wear resistance of 28Cr iron is due to the existing (Fe·Cr)7C3 of high hardness in the iron. The carbide not only possessed good cutting resistance itself but also could protect the matrix of the iron effectivly.更多还原