The variations in the mechanical and magnetic properties of cold-rolled 20Mn23AlV non-magnetic structural steel after annealing at different temperatures were investigated.The microstructure and precipitation changes ...The variations in the mechanical and magnetic properties of cold-rolled 20Mn23AlV non-magnetic structural steel after annealing at different temperatures were investigated.The microstructure and precipitation changes during annealing were studied by optical microscopy,scanning electron microscopy,and transmission electron microscopy.The results show that recrystallization completed after annealing at 620℃,resulting in grain sizes of approximately 800 nm and the best combination of strength and plasticity.The yield-to-tensile ratio of the non-magnetic structural steel after cold rolling continuously decreases from low to high temperatures after annealing,with the highest value being 0.89 and the lowest value being 0.43,indicating a wide range of yield-to-tensile ratio adjustment.The introduction of numerous dislocations during cold rolling provided favorable nucleation sites for precipitation,leading to abundant precipitation of the fine second-phase V(C,N).The phase composition of the samples remained unchanged as single-phase austenite after annealing,and the relative permeability values were calculated to be less than 1.002,meeting the requirements for non-magnetic steel in terms of magnetic properties.展开更多
为弥补自动化集装箱码头自动装载车（Automated Lifting Vehicle,ALV）先到先服务（First Come First Service,FCFS）分配方式的缺陷,提出基于触发事件的ALV作业任务实时分配方式.设置一组触发事件触发ALV实时分配,以ALV到达任务作业点...为弥补自动化集装箱码头自动装载车（Automated Lifting Vehicle,ALV）先到先服务（First Come First Service,FCFS）分配方式的缺陷,提出基于触发事件的ALV作业任务实时分配方式.设置一组触发事件触发ALV实时分配,以ALV到达任务作业点估计时间最短为目标,建立ALV实时分配模型,选用A^＊算法对该模型进行求解.通过与贪婪算法的对比,验证A^＊算法的优越性.对用A^＊算法求解大型集装箱码头ALV实时分配问题的求解速度和稳定性进行实验测试,结果验证了选用A^＊算法的可行性.展开更多
基金support from the Gansu Province Science and Technology Major Project(22ZD6GA008)Commissioner for Science,Technology Program of China Gansu Province(23CXA0013)+1 种基金National Natural Science Foundation of China(NSFC)(52061022)Jiayuguan City Science and Technology Major Project of China Gansu Province(22-02).
文摘The variations in the mechanical and magnetic properties of cold-rolled 20Mn23AlV non-magnetic structural steel after annealing at different temperatures were investigated.The microstructure and precipitation changes during annealing were studied by optical microscopy,scanning electron microscopy,and transmission electron microscopy.The results show that recrystallization completed after annealing at 620℃,resulting in grain sizes of approximately 800 nm and the best combination of strength and plasticity.The yield-to-tensile ratio of the non-magnetic structural steel after cold rolling continuously decreases from low to high temperatures after annealing,with the highest value being 0.89 and the lowest value being 0.43,indicating a wide range of yield-to-tensile ratio adjustment.The introduction of numerous dislocations during cold rolling provided favorable nucleation sites for precipitation,leading to abundant precipitation of the fine second-phase V(C,N).The phase composition of the samples remained unchanged as single-phase austenite after annealing,and the relative permeability values were calculated to be less than 1.002,meeting the requirements for non-magnetic steel in terms of magnetic properties.
文摘为弥补自动化集装箱码头自动装载车（Automated Lifting Vehicle,ALV）先到先服务（First Come First Service,FCFS）分配方式的缺陷,提出基于触发事件的ALV作业任务实时分配方式.设置一组触发事件触发ALV实时分配,以ALV到达任务作业点估计时间最短为目标,建立ALV实时分配模型,选用A^＊算法对该模型进行求解.通过与贪婪算法的对比,验证A^＊算法的优越性.对用A^＊算法求解大型集装箱码头ALV实时分配问题的求解速度和稳定性进行实验测试,结果验证了选用A^＊算法的可行性.
