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一台4M16型二氧化碳压缩机在连续工作时曲轴突然断裂,该曲轴材料为45钢,经锻造后正火处理。为了查清曲轴断裂原因,对断裂曲轴从宏观断口形貌、化学成分、力学性能、超声波探伤及显微组织等方面进行了分析。1分析过程1.1宏观断口分析断裂位置发生在曲轴的曲拐径上,断口大部分垂直于曲拐径轴线,且中间凹,周围凸,中间部位有金属光泽,整个断口没有明显的宏观塑性变形。最终瞬断区与曲拐径轴线大约呈30°,长约250 mm;表面粗糙,并伴有明显的点状金属光泽,其投影面积约占断口面
A 4M16-type carbon dioxide compressor in the continuous work of a sudden crankshaft fracture, the crankshaft material is 45 steel, after forging normalizing. In order to find out the cause of crankshaft fracture, the fracture crankshaft was analyzed from macroscopic fracture morphology, chemical composition, mechanical properties, ultrasonic flaw detection and microstructure. 1 Analysis 1.1 Macro fracture analysis Fracture location occurs on the crankshaft bend radius, most of the fracture perpendicular to the bend radius axis, and the middle concave, around the convex, the middle part of the metallic luster, the entire fracture no significant macroscopic plastic deformation. The final snap-off zone is approximately 30 ° from the radius of crank radius, and is about 250 mm long. The surface is rough and accompanied by the obvious point-like metallic luster. The projected area accounts for about the fracture surface