The Effect of Microstructure on Fatigue Crack Propagation in Pearlitic Eutectoid Steels
The Effect of Microstructure on Fatigue Crack Propagation in Pearlitic Eutectoid Steels
复制标题
显微组织对珠光体共析钢疲劳裂纹扩展的影响
DOI：
10.1179/cmq.1982.21.1.73
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发表时间：
1982
期刊：
影响因子：
--
通讯作者：
D. Stone
中科院分区：
文献类型：
--
作者：
G. Gray;A. Thompson;J. Williams;D. Stone
摘要本文介绍了微观结构对全珠光体共析钢轨钢疲劳裂纹扩展（FCP）速率影响的研究结果。奥氏体化温度和时间以及等温转变温度的变化已被用来改变和控制致密拉伸样品中的原奥氏体晶粒尺寸和珠光体片层间距。测量了这些样本的疲劳裂纹扩展速率，从阈值（da/dN ~ 10−10 m/周期）到接近幂律区域的末端。研究发现，增加珠光体片层间距和增加奥氏体晶粒尺寸都会降低 FCP 率，但后者更为重要。扫描电子断口扫描已用于检查失效样品的断口表面。 FCP 结果根据微观结构变化和断口观察进行了讨论。继续 Cet 文章，对微观结构的影响结果进行评判...
AbstractThis paper describes the results of a study of the effect of microstructure on the fatigue crack propagation (FCP) rate in fully pearlitic eutectoid rail steel. Variations both in austenitizing temperature and time, and in isothermal transformation temperature have been used to alter and control both the prior austenite grain size and the pearlite lamellae spacing in compact tension specimens. The rate offatigue crack growth has been measured in these specimens from threshold (da/dN ~ 10−10 m/cycle) to nearly the end of the power law region. It has been found that increasing pearlite lamellae spacing and increasing austenite grain size both reduce FCP rate, however, the latter variable is more important. Scanning electron fractography has been used to examine the fracture surfaces of the failed specimens. The FCP results are discussed in light of the microstructural changes and the fractographic observations. Resume Cet article decrit les resultats d'une etude des effets de la microstructure sur l...