【摘要】 采用金相分析、硬度测定和热模拟压缩变形等实验,结合采集的工业生产数据,研究了胀断连杆用非调质钢C70S6的材料特性及组织性能控制。主要包括动态连续冷却相变规律及其影响,先共析铁素体的特性及影响,以及硬度的影响因素分析及控制。结果表明:动态连续冷却过程中,随着冷速在0.5～20℃/s范围内变化时,组织类型和含量的变化均不大;金相检验误判是部分连杆锻造企业发现连杆内部存在铁素体含量超标的主要原因;碳当量和索氏体化率是调控硬度的关键。更多还原

【Abstract】 The material characteristic, structure and property control of the air-cooled forging steel C70 S6 for the expanding fracture connecting rod were studied by means of metallographic analysis, hardness measurement and thermal simulated compression deformation, combined with the industrial production data collected. It mainly includes the dynamic continuous cooling transformation law and its influence, the characteristic and influence of proeutectoid ferrite, and the analysis and control of the influence factors of hardness. Results showed that the change of microstructure type and content is not significant with the change of cooling rate in the range of 0.5—20 ℃/s in the process of dynamic continuous cooling. And the main reason why some forging enterprises find that the ferrite content in the connecting rod exceeds the standard is the misjudgment of metallographic examination. And carbon equivalent and sorbitization rate are the key to control hardness.更多还原