Microstructural variation in fatigued interphase arrayed nano-precipitated Ti-microalloyed steel
Journal
Journal of Materials Research and Technology
Journal Volume
15
Pages
2393-2404
Date Issued
2021
Author(s)
Abstract
In the present study, arrayed nano-precipitated TiC in a ferrite matrix was obtained through thermal treatment. The size and shape of the arrayed interphase nano-precipitates were unaffected by fatigue deformation in this Ti-microalloyed steel. In addition, arrayed arrangement of the interphase nano-precipitates was not disrupted by fatigue and still remained only at low cycle numbers, which corresponded to the shortest fatigue life. The interphase nano-precipitated steel was strengthened through a bowing mechanism through which unpinning occurred, dislocation loops were formed, and the microhardness of ferrite was increased. The development of an incipient cell structure in the ferrite matrix was caused by wavy dislocation. After the onset of fatigue, the grain was preferentially rotated toward the {101}α orientation. Higher strain amplitude or lower strain rate led to a more favorable degree of misorientation in the low-angle grain boundaries. ? 2021 The Author(s)
Subjects
Arrayed interphase nano-precipitates
Fatigue
Misorientation angle
Preferred orientation
TiC
Alloy steel
Fatigue of materials
Ferrite
Grain boundaries
Microalloying
Steel metallography
Strain rate
Titanium alloys
Arrayed interphase nano-precipitate
Cycle number
Fatigue deformation
Ferrite matrix
Microstructural variation
Nanoprecipitate
Preferred orientations
Size and shape
Ti microalloyed steels
Titanium carbide
Type
journal article