Premium
Declined Fatigue Crack Propagation Rate of a High‐Strength Steel by Electropulsing Treatment
Author(s) -
Ben Dandan,
Yang Huajie,
Ma Yunrui,
Wang Qiang,
Tian Yanzhong,
Zhang Peng,
Duan Qiqiang,
Zhang Zhefeng
Publication year - 2019
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201801345
Subject(s) - materials science , scanning electron microscope , crack closure , fracture mechanics , composite material , compressive strength , stress concentration , joule heating
The fatigue crack propagation behavior is a key issue for the service of engineering materials. The effect of electropulsing treatment (EPT) on the growth of fatigue crack in a high‐strength steel (AISI 4340 steel) is investigated. It is shown that the crack propagation rate could be significantly declined via high‐density EPT. The crack features of fracture surface are examined using laser scanning confocal microscopy (LSCM) and scanning electron microscopy (SEM). The crack deviation, local crack‐healing and bridging phenomenon are proposed to be beneficial to lower the crack propagation rate, which should be brought out by the current detour, selective Joule heating, compressive stress, and electrical breakdown phenomenon. All these EPT effects exhibit significant contributions to the improvement of fatigue properties in the widely used high‐strength steel.