Effect of RE Modification and Heat Treatment on Impact Fatigue Property of a Wear Resistant White Cast Iron
来源期刊：JOURNAL OF RARE EARTHS2004年第4期
论文作者：常立民 刘建华 王继东 张瑞军
Key words：metal materials; wear resistance of white cast iron; impact fatigue property; rare earths;
Abstract: The morphology of carbides, as well as the generation and propagation of fatigue cracks in a wear resistant white cast iron after impact fatigue test were observed by means of optical microscope and SEM, and the relationship among the content of RE (rare earths) in the wear resistant white cast iron and the heating temperature as well as the length and propagation speed of the fatigue cracks were determined. Based on the obtained results, the effect of RE modification and heat treatment on the impact fatigue property was further studied. Experimental results show that addition of RE can defer the time required for the generation of fatigue cracks, reduce their propagation speed and increase the impact fatigue resistance. The aforesaid effect is more noticeable in case of combined RE modification with heat treatment, which can be attributed to the variation in morphology and the distribution of the eutectic carbide network.
常立民1，刘建华2，王继东1，张瑞军2
(1.Analysis and Measure Center,Jilin Normal University,Siping 136000,China;
2.Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,China)
Abstract:The morphology of carbides, as well as the generation and propagation of fatigue cracks in a wear resistant white cast iron after impact fatigue test were observed by means of optical microscope and SEM, and the relationship among the content of RE (rare earths) in the wear resistant white cast iron and the heating temperature as well as the length and propagation speed of the fatigue cracks were determined. Based on the obtained results, the effect of RE modification and heat treatment on the impact fatigue property was further studied. Experimental results show that addition of RE can defer the time required for the generation of fatigue cracks, reduce their propagation speed and increase the impact fatigue resistance. The aforesaid effect is more noticeable in case of combined RE modification with heat treatment, which can be attributed to the variation in morphology and the distribution of the eutectic carbide network.
Key words:metal materials; wear resistance of white cast iron; impact fatigue property; rare earths;
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