【摘要】 采用光谱仪、光学显微镜、扫描电镜等分析了圆锥破碎机服役后高锰钢圆锥的成分和组织形貌特征,结合对不同区域材料的冲击吸收功、加工硬化层显微硬度测试及失效圆锥的磨损曲线测定,对耐磨圆锥的失效机理进行了综合分析。结果表明:冲击作用下高硬度的花岗岩对圆锥表层的凿削是耐磨圆锥失效的主要原因;冒口部位的局部显微疏松及晶界处局部未溶碳化物的存在是造成宏观裂纹的原因,加速了耐磨圆锥的失效。更多还原

【Abstract】 The failure behavior of the high manganese steel cone of the cone crusher was studied in the current work.Spectrometer, optical microscope and scanning electron microscopy were used to analyze the composition and microstructure of high-manganese steel after service. Regions with the damages under different degrees of impact energies were also observed. Microhardness of work hardened layer and wear curve of the failure cone were measured and the failure mechanism of the wear cone was comprehensively analyzed. The results showed that the drilling and cutting from the hard grinding material which consists of granite is the main reason for the failure of the cone. The local microscopic porosity of the riser and the presence of local undissolved carbide at the grain boundary accelerated the macroscopic cracks of the steel, resulting in the failure of the cone.更多还原