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Metals and Materials International

, Volume 24, Issue 5, pp 970–980 | Cite as

Effect of Hierarchical Microstructures of Lath Martensite on the Transitional Behavior of Fatigue Crack Growth Rate

  • Ming Yang
  • Yi Zhong
  • Yi-long Liang
Article

Abstract

In this study, the fatigue-crack growth (FCG) behavior of 20CrMTiH steel with different substructure sizes was investigated. The results showed that coarsen microstructures exhibit excellent growth resistance. Moreover, two transitional behaviors were observed in the FCG curves of all specimens. The first transition point occurs in the near-threshold regime, whereas the second transition point occurs in the Paris regime. A comparison of substructure size to cyclic plastic size showed that the block size is almost equal to cyclic plastic size at ∆KT1, indicating that block size is an effective grain size to control the first transitional behavior of fatigue-crack propagation, whereas the second transitional behavior is related to the packet width or grain size. According to the fracture morphology, the fracture mechanism above and below the transition point responsible for the above phenomenon were distinguished. In addition, two prediction models based on microstructure size were established for lath martensite to evaluate the threshold and stress intensity factor range at the transition point.

Keywords

Fatigue Crack growth Lath martensite Microstructure Transitional behavior 

Notes

Acknowledgements

The research documented in this work was financially supported by the Joint Foundation of Guizhou province, China (Grant No. [2017] 7244 and [2017]5788), the National Natural Science Foundation of China (Grant No. 51461006), and the Natural Science Foundation of Guizhou province, China (Grant No. [2014] 2003).

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Copyright information

© The Korean Institute of Metals and Materials 2018

Authors and Affiliations

  1. 1.Faculty of Material Science and EngineeringKunming University of Science and TechnologyKunmingPR China
  2. 2.The National and Local Joint Engineering Laboratory for High-performance Metal Structure Materials and Advanced Manufacture TechnologyGuiyangPR China

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