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本文对现场选取的二组因横裂失效的锰叉,进行了断口的宏观分析和扫描电镜分析,确征为疲劳断裂,且属于低应力高周疲劳。这与高锰钢试样多冲疲劳过程的研究结果很相似。锰叉内部冶金缺陷集中区域是主要的疲劳裂纹源区,金相磨面上观察到的沿晶疏松、网状碳化物、磷共晶和晶粒过分粗大等,均是促进疲劳裂纹扩展的因素。用俄歇谱仪测定了奥氏体晶界存在磷的偏聚,从而找到高锰钢脆性断口的原因。本文指出了影响锰叉使用寿命的主、次因素和改进方向,为提高锰叉质量提供了科学依据。
In this paper, macroscopic and scanning electron microscopic analysis of the two groups of manganese forks with transverse failure selected by the site were carried out, and they were characterized as fatigue fracture and belong to low-stress high-cycle fatigue. This is similar to the study on the multi-stroke fatigue process of high manganese steel samples. Manganese fork internal metallurgy defect concentrated area is the main source of fatigue cracks, metallographic grinding surface observed along the loose crystal, mesh carbide, phosphorus eutectic and excessive coarse grains, are the factors that promote fatigue crack growth . The rupture of phosphorus in the austenite grain boundaries was determined by Auger spectrometer to find out the reason of brittle fracture of high manganese steel. This paper points out the main, sub-factors and improvement directions that affect the service life of manganese fork, and provides a scientific basis for improving the quality of manganese fork.