论文部分内容阅读
曾经对最后加工过的亚共晶生铁活塞环在自由状态下短期加热后的热稳定性进行了测量。 环的热稳定性是用测量残余变形、硬度（用不同方法测量）、矫顽力相对值和弹性的方 法来进行的。 此外，还对活塞环的耐蚀性进行了评定。 分析了所得实验数据以后，得出这样的结论：当活塞环在自由状态下加热时，有两个典 型的残余变形区域。这是与活塞环中由于机械加工而引起的残余应力在初期之减弱有关。 此时，环口溶解量的增加合引起弹性的增高。 硬度与矫顽力相对值的变化（用Ｍ·Ｈ·米海也夫式矫顽力测定信测量表明，用测量硬度 （摆锤法）和矫顽力的方法来评定热稳定性可以得到比较的数据。此外，这些方法还能发现 在较低加热温度下 （５００℃以下）就已开始的金属再结晶过程。 用金属刀具加工环的表面可以提高耐蚀性． 在低温加热下，消除工艺残余应力，亦可提高生铁活塞环的耐蚀性．
The thermal stability of the final machined hypoeutectic pig iron piston ring after it was heated in a free state for a short period of time was measured. Ring thermal stability is measured by residual deformation, hardness (measured by different methods), the relative value of coercivity and elastic method. In addition, the corrosion resistance of the piston ring was also evaluated. After analyzing the experimental data obtained, it is concluded that there are two typical residual deformation zones when the piston ring is heated in a free state. This is related to the initial reduction of the residual stress in the piston ring due to machining. In this case, the increase in the amount of dissolution of the annulus causes an increase in elasticity. The change in the relative hardness and coercivity values (measured by M · H · Mehrdoff coercivity measurements show that the thermal stability can be evaluated by measuring hardness (pendulum method) and coercivity In addition, these methods can also be found in the lower heating temperature (500 ° C) has started the metal recrystallization process.Metal cutting tool ring surface can improve the corrosion resistance.At low temperature heating, the elimination process Residual stress, but also improve the corrosion resistance of pig iron piston rings.