一、前言粉末锻造工艺是六十年代出现的加工新工艺,近年来得到了迅速发展。粉末热锻工艺在提高材料利用率、减少加工工序、降低成本、提高工件精度等方面都具有显著的优越性,特别是由于烧结坯内孔隙的存在,大大降低了材料的变形力。采用粉末烧结坯热锻工艺,由于温度较高,影响工件精度及表面光洁度,孔隙的 I. Introduction The powder forging process is a new processing technology that appeared in the 1960s and has been rapidly developed in recent years. Powder hot forging process has significant advantages in improving material utilization, reducing processing steps, reducing costs and improving workpiece accuracy, especially due to the existence of pores in the sintered billet, greatly reducing the material deformation force. Powder billet hot forging process, due to the higher temperature, the impact of workpiece accuracy and surface finish, pore