3rd International Conference on Characterisation of Crack Tip Fields
Conference Date
APR 20-22, 2015
Conference Place
Urbino, ITALY
Abstract
For high-strength steels, the crack initiation of very-high-cycle fatigue (VHCF) is commonly at the interior of material with fish-eye (FiE) morphology containing a fine-granular-area (FGA) surrounding an inclusion as crack origin, and FGA is regarded as the characteristic region of crack initiation. Here, we carefully examined the micro-morphology of FGA and FiE for two high-strength steels. The results revealed that the microscopic nature of FGA is a thin layer of nanograins. Then we proposed the formation mechanism of FGA: Numerous Cyclic Pressing (NCP) between originated crack surfaces, which causes grain refinement at originated crack wake and therefore the formation of FGA. The results of second set experiment showed that the cases with negative stress ratios exhibit the prevalence of nanograin layer in FGA region and the nanograin layer vanishes for the cases with positive stress ratios, which is a verification of the proposed NCP model. (C) 2015 Elsevier Ltd. All rights reserved.
Hong YS,Liu XL,Lei ZQ,et al. The formation mechanism of characteristic region at crack initiation for very-high-cycle fatigue of high-strength steels[C]INTERNATIONAL JOURNAL OF FATIGUE,2016.
; Liu XL(刘小龙); Lei ZQ(雷铮强)
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