The microstructure evolution and strengthening mechanism of WE54 alloy with different hard-plate rolling(HPR)processes were systematically investigated.The results suggest that the mechanical properties of the as-roll...The microstructure evolution and strengthening mechanism of WE54 alloy with different hard-plate rolling(HPR)processes were systematically investigated.The results suggest that the mechanical properties of the as-rolled alloys are significantly enhanced compared to those of the as-cast alloy.When subjected to three rolling passes at 450℃ and 490℃,grain refinement occurs due to dynamic recrystallization.A mixed-grain structure is formed after a single pass rolling with a substantial reduction(65%)at 490℃.The dynamic recrystallization(DRX)mechanism of the alloy during the HPR includes continuous dynamic recrystallization(CDRX),discontinuous dynamic recrystallization(DDRX),and twin-induced recrystallization(TDRX).The WE54 alloy exhibits the highest strength after three passes of HPR at 450℃,with tensile strength and yield strength of 374 and 323 MPa,respectively.The significant improvement in the mechanical properties of the alloy is primarily attributed to fine-grain strengthening,solid solution strengthening,and dislocation strengthening.展开更多
为了提升继电保护硬压板智能巡检的效率与准确性,研究提出一种改进的You Only Look Once(YOLO)目标检测算法。首先,对YOLOv5算法进行了针对性改进,采用普通卷积替换Focus结构,以适应移动端硬件限制;引入ShuffleNet V2架构作为主干网络,...为了提升继电保护硬压板智能巡检的效率与准确性,研究提出一种改进的You Only Look Once(YOLO)目标检测算法。首先,对YOLOv5算法进行了针对性改进,采用普通卷积替换Focus结构,以适应移动端硬件限制;引入ShuffleNet V2架构作为主干网络,降低模型的计算量和参数量。同时,设计了机器人智能巡检方法,在移动端设备上运行改进后的YOLO算法,并采用动态尺寸推理技术提高推理效率。结果表明,改进YOLO算法的精度达92.3%,平均检测速度为25 fps,均优于对比算法。在不同光照条件和遮挡情况下,机器人智能巡检系统检测准确率较高、漏检率和误检率较低,展现出良好的环境适应性和巡检有效性。研究方法提高了继电保护硬压板检测的智能化水平,有助于保障电力系统的安全稳定运行。展开更多
基金financially supported by the Natural Science Basic Research Program of Shaanxi Province,China(No.2023-JC-QN-0581)Advanced Power Specialty,China(No.YK22C-9)。
文摘The microstructure evolution and strengthening mechanism of WE54 alloy with different hard-plate rolling(HPR)processes were systematically investigated.The results suggest that the mechanical properties of the as-rolled alloys are significantly enhanced compared to those of the as-cast alloy.When subjected to three rolling passes at 450℃ and 490℃,grain refinement occurs due to dynamic recrystallization.A mixed-grain structure is formed after a single pass rolling with a substantial reduction(65%)at 490℃.The dynamic recrystallization(DRX)mechanism of the alloy during the HPR includes continuous dynamic recrystallization(CDRX),discontinuous dynamic recrystallization(DDRX),and twin-induced recrystallization(TDRX).The WE54 alloy exhibits the highest strength after three passes of HPR at 450℃,with tensile strength and yield strength of 374 and 323 MPa,respectively.The significant improvement in the mechanical properties of the alloy is primarily attributed to fine-grain strengthening,solid solution strengthening,and dislocation strengthening.
