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1.引言球铁曲轴经过280℃左右等温淬火整体强化,获得下贝氏体加少量马氏体及残余奥氏体基体组织,综合机械性能好,其可靠性已为我厂S195柴油机多年生产应用所证实。有关球铁曲轴等温淬火获得良好的传统性能指标,耐磨性、疲劳性能,以及断裂韧性的一般情况,国内发表的文献均有过这方面的介绍,我曾就这方面资料作过整理。这里针对曲轴疲劳断裂失效问题,来讨论一下贝氏体球铁曲轴的断裂抗力,并在此基础上提出工艺改进方向有效地提高球铁曲轴的可靠性问题。 2.曲轴失效分析曲轴是发动机中最重要的机件之一,发动机的全部功率都通过它输出。曲轴承受的载荷主要是弯曲疲劳、扭转疲劳,以及活塞经过连
1. Introduction Ductile iron crankshaft after about 280 ℃ isothermal hardening as a whole to obtain lower bainite plus a small amount of martensite and residual austenite matrix, the overall mechanical properties, and its reliability has been our plant S195 diesel for many years production applications Confirmed. The ductile iron crankshaft obtained by the austempered good traditional performance indicators, wear resistance, fatigue properties, as well as the general situation of fracture toughness, the domestic published literature have had this introduction, I have done on this information. Here for the crankshaft fatigue failure failure, to discuss the billet ductile iron crankshaft fracture resistance, and on the basis of the proposed process improvement direction effectively improve the reliability of ductile iron crankshaft. 2. Crankshaft failure analysis Crankshaft is one of the most important parts of the engine through which the full power of the engine is output. The crankshaft load is mainly bending fatigue, torsion fatigue, and the piston through the even