不同热处理条件下ADI材料表面刮伤机理

The study of the heat treated Austempered Ductile Iron (ADI) scuffing mechanism

材料表面刮伤现象经常出现在各类发动机零部件上,如发动机活塞、齿轮、凸轮以及传动轴。由于等温淬火球墨铸铁(ADI)有很好的自润滑性,所以这种材料的应用变得越来越广泛。文中目的是研究两种不同镍(Ni)元素含量的ADI材料(A和C)在不同热处理条件下的表面刮伤机理。实验在旋转球-盘测试仪上进行,并使用白矿物油进行润滑。实验开始后逐渐加力,直至刮伤产生。实验结果证明,镍含量较高的ADI有比较高的抗刮伤能力。同样元素组成的样品之间硬度并不是衡量刮伤性能的决定性因素。

Scuffing can be occurred in various engineering components,such as engine cylinders and liners,gears,crankshafts,and camshafts.Because of self-lubricating characteristics and excellent mechanical properties,Austempered Ductile Iron（ADI）is finding increasing application in those components.The objective of this research is to study the difference of scuffing behavior between two different ductile iron materials（A and C）with several different treatments（austempered with different time and temperature,quenched and inducted）.Rotational ball-on-disk tests were run under lubricant of white mineral oil.A step load was applied until scuffing occurred.The results indicate that ADI with Ni have better scuffing resistance,and the hardness is not the dominate parameter of scuffing resistance between specimens which have same chemical composition.