Characterization of early fatigue microstructure in AISI 321 steel using eddy current non-destructive methodology

Kunpeng Liu; Zihua Zhao; Zheng Zhang

doi:10.1007/s11595-013-0845-8

Journal of Wuhan University of Technology Materials Science Edition ›› 2013, Vol. 28 ›› Issue (6) : 1201 -1206. DOI: 10.1007/s11595-013-0845-8

Metallic Materials

Characterization of early fatigue microstructure in AISI 321 steel using eddy current non-destructive methodology

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Abstract

Accumulative damage during early stage of fatigue in AISI 321 steel was investigated by eddy current test, atomic force microscopy, X-ray diffraction and transmission electron microscopy. Surface slip, dislocation, and strain-induced martensite were determined as the main damage types. Moreover, damage during the fatigue was found to be increased with the increasing fatigue cycles and load amplitude. The contribution of strain-induced martensite to the total eddy current amplitude (V _max) was enhanced with the increase in its volume fraction. Finally, a linear relationship between V _slip and the height of surface slip was established.

Keywords

eddy current / early stage of fatigue / surface slip / strain-induced martensite / dislocation

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Kunpeng Liu, Zihua Zhao, Zheng Zhang. Characterization of early fatigue microstructure in AISI 321 steel using eddy current non-destructive methodology. Journal of Wuhan University of Technology Materials Science Edition, 2013, 28(6): 1201-1206 DOI:10.1007/s11595-013-0845-8

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