铸铁曲轴的铸造及热处理工艺研究

• 作 者: 卢学玉 李成龙
• 机 构: 江南大学机械工程学院江苏省食品先进制造装备技术重点实验室,
• 出 处: 铸造技术
• 发表日期: 2016年08期
• 关键词: 铸铁 曲轴 铸铁曲轴 铸造 热处理工艺 正火处理 断后伸长率 冲击功 力学性能 合金元素

采用铁型覆砂工艺制备了8组铸铁曲轴,研究了合金元素组成和热处理对铸铁曲轴组织和力学性能的影响,并分析了其作用机理。结果表明,通过第一阶段正火处理:(850±25)℃、保温(2±0.5)h,第二阶段回火处理:(580±20)℃、保温(2±0.5)h,铸铁曲轴获得了较好的综合力学性能;曲轴的抗拉强度都在885 MPa以上,断后伸长率5.1%以上,冲击功在55 J以上。

Eight sets of cast iron crankshafts were prepared by using iron sand-milled technology. The effects of alloying elements and heat treatment on the microstructure and mechanical properties of the cast iron crankshafts were studied. The mechanism of action was also analyzed. The results showed that the first stage of normalizing treatment was: (850 ± 25) ℃, holding (2 ± 0.5) h, the second stage of tempering: (580 ± 20) ℃, The mechanical properties of the crankshaft were better than that of the crankshaft. The tensile strength of the crankshaft was above 885 MPa, the elongation at break was above 5.1% and the impact energy was over 55 J.