超大型储能飞轮锻件晶粒细化工艺研究OA

For the large energy flywheel forgings of 30Cr2Ni4MoV steel with an axle body diameter of nearly 3m,due to the large upsetting ratio forging,the grains in the difficult deformation zone are coarse and the microstructure inheritance is severe.The traditional multiple normalizing process is difficult to effectively refine the grains of such forgings and is hard to meet the flaw detection requirements.Therefore,the isothermal transformation"nose temperature"of the material was experimentally determined,and then a dedicated isothermal transformation process was developed and applied in engineering practice.This effectively improved the grain refinement effect and economic efficiency of the forgings,providing key technical support for the quality control of similar super-large forgings.