高炉轴流压缩机叶片榫齿裂纹分析  

Crack Analysis on Blade Tenon of Axial-flow Compressor for Blast Furnace

作　　者：肖华强[1] 肖丁天 杜顺林[1] 汪涛[1] 赵亮[1] XIAO Huaqiang;XIAO Dingtian;DU Shunlin;WANG Tao;ZHAO Liang(Technology Center,Wukun Steel Co.,Ltd.,Kunming 650302,China;School of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]武钢集团昆明钢铁股份有限公司技术中心,云南昆明650302 [2]昆明理工大学冶金能源学院,云南昆明650093

出　　处：《热加工工艺》2024年第22期129-133,共5页Hot Working Technology

摘　　要：针对高炉轴流压缩机叶片裂纹,对20Cr13不锈钢叶片进行渗透探伤、化学成分、金相组织、维氏硬度、能谱分析等检测。对叶片进行热处理试验,研究了金相组织中颗粒碳化物的形成机理。结果表明:20Cr13马氏体不锈钢叶片金相组织为回火索氏体+未熔碳化物。叶片淬火温度为950℃时,大量碳化物未熔入奥氏体,淬火及回火组织的碳化物数量、大小及分布遗传了原淬火前的碳化物特征。未熔碳化物颗粒不均匀密集分布及沿晶界分布破坏了基体组织的连续性,为裂纹的萌生和扩展创造了条件。在周期性弯曲应力作用下,榫齿根部出现裂纹,裂纹沿密集分布的碳化物或晶界扩展,形成了一定深度和长度的疲劳裂纹。In view of the blade crack of axial flow compressor in blast furnace,the blade was detected by penetration flaw detection,chemical composition,metallographic structure,Vickers hardness,energy spectrum analysis and so on.The formation mechanism of granular carbides in metallographic structure was studied by heat treatment test for blades.The results show that,the microstructure of 20Cr13 martensitic stainless steel blades is tempered sorbite+non-melt carbide.A large amount of carbide does not melt into austenite at a quenching temperature of 950℃.The number,size and distribution of carbides in quenched and tempered microstructure are inherited from the characteristics of carbides before quenching.The inhomogeneous and dense distribution of unfused carbide particles and the distribution along grain boundary destroy the continuity of matrix microstructure,and creating conditions for crack initiation and propagation.Under the action of periodic bending stress,cracks appear in the root of tenon teeth.The crack propagates along dense carbide or grain boundary,forming the fatigue crack of certain depth and length.

关 键 词：风机叶片 20Cr13 裂纹 未熔碳化物 榫齿 

分 类 号：TG111.91[金属学及工艺—物理冶金]