60CrMnMo钢热疲劳裂纹形成及扩展机制的研究  

MECHANISM OF FORMATION ANO PROPAGATION OF THBRMAL FATIGUE CRACK ON 60CrMnMo STEEL

作　　者：崔明勋[1] 刘伟[1] 赵品[1] 

机构地区：[1]燕山大学,燕山大学材抖系

出　　处：《钢铁》1994年第11期39-43,共5页Iron and Steel

摘　　要：本文借助高频感应加热；金相和电镜（热疲劳试样表面上限温度在７２３～８７３Ｋ，疲劳次数在１０００次内），研究了６０ＣｒＭｎＭｏ钢热疲劳裂纹的形成和扩展过程，结果表明：主裂纹在挤入沟处萌生，并使其前沿产生结构疏松；裂纹扩展分为，裂纹与空孔或空孔与空孔正断连结的快速不稳定扩展和裂纹沿亚晶界蠕动切断的慢速稳定扩展的两个阶段；并提出了裂纹扩展的数学模型。AbstractThe paper,by means of high-frequency induction heatiing,metallograph and electron microscope( the highest temperature at specimen surface is 723k-873K and thermal fatigue times are below 1000),studies the process of thermal fatigue crack’s formation andpropagation on 60CrMnMo ste-el.The results show that main cracks are formed at extruded ditches and let the forward edges of the extruded ditches produce construction loosing,the propagation is divMed into two stages,i.e. quick,non-steady,straight-fracturc crack through colnbination of positive holes with positive holes,or positive holes with microcracks and low-speed,sheer-fracture crack wriggled along subgr-ain boundary. The mathematical model of the crack propagation is put forward.

关 键 词：60CRMNMO钢 热疲劳裂纹 扩展机制 轧辊 

分 类 号：TG333.17[金属学及工艺—金属压力加工] TG142.1[一般工业技术—材料科学与工程]