Microstructure and mechanical properties of electron beam post-weld aging treatment (PWAT) conditions. The results welded alloy J75 were studied under as-welded and showed that high-quality welds were produced by el...Microstructure and mechanical properties of electron beam post-weld aging treatment (PWAT) conditions. The results welded alloy J75 were studied under as-welded and showed that high-quality welds were produced by electron beam welding. Under as-welded condition, a fine dendritic structure consisting of gamma dendrite matrix and Laves phase was observed in the welds. Better mechanical properties were obtained in the weld zone than that of base metal because of the fine size of the dendritic structure. After PWAT, a discontinuous distribution of γ' particles existed in the dendritic structure. The presence of a γ' depletion zone in the dendrite core resulted in a significant degradation of mechanical properties of the weld.展开更多
在部分计算机联锁系统中,输入和输出采用安全编码的方式来保证采集和驱动的安全性。安全编码需事先固化到安全输入/输出板的Flash存储器中,输入/输出板通过读取安全编码的状态来判断系统是否正常工作。为此设计了使用C8051F020单片机作...在部分计算机联锁系统中,输入和输出采用安全编码的方式来保证采集和驱动的安全性。安全编码需事先固化到安全输入/输出板的Flash存储器中,输入/输出板通过读取安全编码的状态来判断系统是否正常工作。为此设计了使用C8051F020单片机作为控制器的编程器,并基于Qt设计了上位机程序来实现对输入/输出板上28F128J3F75 Nor Flash的操作,包括自动识别输入/输出板、读/写安全编码等。在文中详细介绍了系统结构、硬件连接、软件设计以及上位机读/写安全编码的数据格式定义。展开更多
基金supported by the National Natural Science Foundation of China and China Academy of Engineering Physics(Project No.U1230118)
文摘Microstructure and mechanical properties of electron beam post-weld aging treatment (PWAT) conditions. The results welded alloy J75 were studied under as-welded and showed that high-quality welds were produced by electron beam welding. Under as-welded condition, a fine dendritic structure consisting of gamma dendrite matrix and Laves phase was observed in the welds. Better mechanical properties were obtained in the weld zone than that of base metal because of the fine size of the dendritic structure. After PWAT, a discontinuous distribution of γ' particles existed in the dendritic structure. The presence of a γ' depletion zone in the dendrite core resulted in a significant degradation of mechanical properties of the weld.
文摘在部分计算机联锁系统中,输入和输出采用安全编码的方式来保证采集和驱动的安全性。安全编码需事先固化到安全输入/输出板的Flash存储器中,输入/输出板通过读取安全编码的状态来判断系统是否正常工作。为此设计了使用C8051F020单片机作为控制器的编程器,并基于Qt设计了上位机程序来实现对输入/输出板上28F128J3F75 Nor Flash的操作,包括自动识别输入/输出板、读/写安全编码等。在文中详细介绍了系统结构、硬件连接、软件设计以及上位机读/写安全编码的数据格式定义。