Development of Thermal Cyclic Treatment Modes to Improve the Quality of Castings With Different Wall Thickness From Gray Cast Iron With Lamline Graphite

The paper presents research on improving the quality of castings with different wall thicknesses made of gray cast iron, smelted on a single charge. The results of a study on the development of thermal cyclic heat treatment modes for graphitizing annealing of bleached castings and obtaining a dispersed pearlite structure and a given hardness in thick-walled castings are presented. It has been shown that the use of thermal cycling treatment instead of isothermal types of graphitizing and hardening treatment of cast iron castings gives a better effect in correcting structures, reduces the duration of the process, and reduces the energy intensity of production.