摘要
对在空气中２（１／４）Ｃｒ－１Ｍｏ钢的短裂纹低周疲劳扩展特性进行研究发现，短裂纹的扩展行为与长裂纹有着相似的三个阶段，并有三个方程分别与之对应。经方程ｄａ／ｄＮ＝ｃ（ΔＪ）ｎ计算得到，临界裂纹扩展门槛值ΔＪｔｈ５６４×１０－６ＭＮ／ｍ。ＳＥＭ断口分析表明，三个阶段的短裂纹扩展特性各不相同。
The investigation made to the 2(1/4)Cr-1Mo steel for low frequency fatigue propagation with short crack indicated that the short crack, having a similar crack propagation behaviour to long one's, consists of three stages relating to three equations with the model of da/dN=c(?J) n,respectively, on which the calculation of threshold value ?J th ?64×10 -6 MN/m was based. In addition, the different crack propagation mechanism has been observed in three different crack propagation stages after fracture analysis used by SEM.
出处
《材料科学与工程》
CSCD
1998年第3期82-84,25,共4页
Materials Science and Engineering
关键词
短裂纹
低周疲劳
裂纹扩展速度
△J参量
Short-crack
Low frequency fatigue
Crack propagation rate
△J parameter
