1Cr17Ni2钢制操纵盒小轴断裂原因分析  

Analysis of fracture cause of 1Cr17Ni2 steel small shaft of control box

作　　者：杨玉川 李巍 熊勇 Yang Yuchuan;Li Wei;Xiong Yong(Guizhou Liyang Aviation Power Co.,Ltd.,AECC,Guiyang Guizhou 550014,China)

机构地区：[1]中国航发贵州黎阳航空动力有限公司,贵州贵阳550014

出　　处：《金属热处理》2022年第3期261-265,共5页Heat Treatment of Metals

摘　　要：飞机发动机操纵盒小轴在安装时发生断裂。通过断口形貌、显微组织、硬度和化学成分、对比试验和模拟试验等,确定了操纵盒小轴的断裂性质和原因。结果表明,操纵盒小轴在570℃回火脆性区进行回火后发生沿晶脆断,其原因并非仅由于在回火脆性区回火降低了操纵盒小轴的冲击性能,而主要是由于操纵盒小轴的基体组织中无铁素体,铁素体的缺失降低了晶面和相界面的总面积,导致在回火脆性区回火时晶界生成了更多的弱化粒子,加剧了其高温回火脆性,最终导致操纵盒小轴的沿晶脆断。操纵盒小轴的奥氏体形成元素(Ni)含量偏高、铁素体形成元素(Cr,Si)含量偏低导致了基体组织中无铁素体。A small shaft of the aircraft engine control box broke during installation.The fracture properties and causes of the small shaft of control box were determined by means of fracture morphology,microstructure,hardness and chemical composition,contrast test and simulation test.The results show that the intergranular brittle fracture occurs in the small shaft after tempering in the tempering brittle zone of 570℃,the reason of which is not only due to the reduction the impact performance of the small shaft caused by the tempering at the temperature in the brittleness zone,but mainly because there is no ferrite in the matrix.The loss of ferrite reduces the total area of grain plane and phase interface,resulting in more weakened particles generates at grain boundary during tempering brittle zone,which intensifies the high temperature tempering brittleness,and finally leads to intergranular brittle fracture of the small shaft.The absence of ferrite in the matrix is due to the high content of austenite forming elements(Ni)and low content of ferrite forming elements(Cr,Si)in the small shaft.

关 键 词：操纵盒小轴 1CR17NI2钢 沿晶断裂 回火脆性 无铁素体 

分 类 号：V233.72[航空宇航科学与技术—航空宇航推进理论与工程]