Microstructural variation in fatigued interphase arrayed nano-precipitated Ti-microalloyed steel

• Main Authors: Chieh-Ning Yen, Liu-Wen Chang, Chen-An Hsu, Jer-Ren Yang, Horng-Yi Chang, Shing-Hoa Wang, Hsueh-Ren Chen
• Format: Article
• Language: English
• Published: Elsevier 2021-11-01
• Series: Journal of Materials Research and Technology
• Subjects: Fatigue; Arrayed interphase nano-precipitates; TiC; Misorientation angle; Preferred orientation
• Online Access: http://www.sciencedirect.com/science/article/pii/S2238785421010358

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.