某型发动机燃烧室磁粉探伤异常磁痕分析  

Abnormal Analysis of the Engine Combustion Chamber’s Magnetic Image

作　　者：刘天昳 李鹏辉 王倩[1] LIU Tianyi;LI Penghui;WANG Qian(School of Material Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China;North International Ltd,Shijiazhuang 050011,China;No.197 Factory,Shijiazhuang 052165,China)

机构地区：[1]河北科技大学材料学院,石家庄050018 [2]北方工程设计研究院有限公司,石家庄050011 [3]国营197厂,石家庄052165

出　　处：《弹箭与制导学报》2020年第3期135-138,154,共5页Journal of Projectiles,Rockets,Missiles and Guidance

摘　　要：针对某型发动机燃烧室在磁粉探伤过程中发现的异常磁痕,对其所用材料进行化学成分分析、金相检验、扫描电镜能谱检验等理化检测,并详细分析了其磁痕产生的原因。结果表明:材料组织中存在异于基体的金相组织是由于材料中存在着明显的带状微区偏析,成分偏析导致了奥氏体稳定性提高,马氏体转变开始温度降低,致使组织中出现一定数量的条块状残余奥氏体组织,造成磁粉探伤中出现异常磁痕。这类磁痕不影响产品力学性能。Aiming at the abnormal magnetic marks found in the process of magnetic particle inspection in a certain engine combustor,the chemical composition analysis,metallographic examination,scanning electron microscopic energy spectrum examination and other physical and chemical tests were carried out on the materials used,and the causes of the magnetic marks were analyzed in detail.The results show that the existence of the metallographic structure different from the matrix is due to the obvious banded micro-segregation in the material.The composition segregation leads to the increase of Austenite Stability and the decrease of martensitic transformation starting temperature,which results in the occurrence of a certain amount of retained austenite in the structure and the appearance of magnetic particle inspection.This kind of magnetic trace does not affect the mechanical properties of the product.

关 键 词：发动机燃烧室 异常磁痕 偏析 稳定化 

分 类 号：TK403[动力工程及工程热物理—动力机械及工程] TG115.284[金属学及工艺—物理冶金]