针对F-1300泥浆泵液缸在精加工后,内孔表面发现裂纹的问题,采用金相,扫描电镜和冲击试验对其进行了分析,检验发现液缸表面开裂的主要原因是,其基体组织中存在着粗大的魏氏组织及粗大的奥氏体晶粒等过热组织,致使材料晶界脆化,在淬火过程中组织应力超出了材料的抗破断极限,造成工件自身的开裂。 Aiming at the problem of cracks found on the inner hole surface after finishing the F-1300 slurry pump cylinder, the metallographic, scanning electron microscopy and impact tests were used to analyze the cracks. The main reason for the crack on the surface of the cylinder was that the matrix structure In the presence of coarse Widmanstatten organization and coarse austenite grains and other overheating organization, resulting in grain boundary embrittlement, quenching process in the organization of the stress beyond the breaking resistance of the material, causing the workpiece itself cracking.