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球墨铸铁由于强度高、耐磨性好,工作比较可靠等优良性能,以及易于生产,成本低等特点,所以球墨铸铁作为曲轴材料已广泛应用。但是由于球墨铸铁曲轴在工艺上、化学成分上以及其它原因,引起金相组织的变化,偶然也会发生使用仅几百小时的曲轴早期断裂。鉴于弯曲疲劳是曲轴断裂的主要破坏形式,为了探讨金相组织对球墨铸铁曲轴疲劳强度的影响,对14根175曲轴(经正火回火热处理)进行了曲轴本体疲劳试验,并进行机械性能、化学成分,和金相组织的分析(见表1、2)。
Ductile iron as a result of high strength, wear resistance, work more reliable and other excellent performance, and easy to produce, low cost, so ductile iron as a crankshaft material has been widely used. However, as the ductile iron crankshafts in the process, chemical composition and other reasons cause the microstructure to change, the crankshaft early fracture occasionally occurs only for hundreds of hours. In order to investigate the effect of microstructure on the fatigue strength of ductile iron crankshafts, bending fatigue of 14 crankshaft crankshaft (normalizing and tempering heat treatment) was carried out on crankshaft, and the mechanical properties, Chemical composition, and microstructure analysis (see Table 1, 2).