摘要
采用M-2000型摩擦磨损试验机,对不同蠕化率的蠕墨铸铁、灰铸铁和球墨铸铁在相同条件下进行滚动磨损试验,对比分析了蠕墨铸铁表面磨损形貌及其滚动磨损机理。结果表明,随着蠕化率的提高,蠕墨铸铁中石墨尺寸减小、分布更加均匀化,其硬度和耐磨性能呈下降趋势。蠕墨铸铁滚动磨损机理以表面疲劳磨损和剥层损伤为主,磨损表面出现层状结构剥落后留下的凹坑。蠕铁中石墨虽然具有自润滑作用,但是因其本身硬度较低,在循环接触应力下破碎,成为表面疲劳的裂纹源,反而加剧了磨损。蠕墨铸铁滚动磨损性能接近球墨铸铁,而优于灰铸铁。
The rolling friction property of vermicular cast iron with different vermicularity was tested on M- 2000 type friction testing machine under the same conditions, compared with gray cast iron and ductile cast iron. Surface wear morphology and rolling wear mechanisms was analyzed. The results showed that with the increase of vermicularity, the distribution of vermicular graphite transformed homogeneous and refinement. Meanwhile, the hardness and wear resistance were on the decline. The surface fatigue wear and delamination damage were the main rolling wear mechanism of vermicular cast iron. Hollows appeared on the wear surface, since layer structure had split away from the surface. Although vermicular graphite had self-lubricating function, and it was broken under cyclic contact stress due to the low hardness, which formed the surface fatigue crack source. Close to ductile cast iron, rolling wear property of vermicular cast iron was better than that of gray cast iron.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2016年第14期113-116,139,共5页
Materials Reports
关键词
蠕墨铸铁
蠕化率
滚动磨损性能
疲劳磨损
vermicular cast iron, vermicularity, rolling wear property, fatigue wear
