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INFLUENCE OF GRAIN SIZE ON STRENGTH AND HYDROGEN INDUCED CRACKING OF DUPLEX STAINLESS STEELS

HE Jianhong Huazhong University of Science and Technology , Wuhan , ChinaTANG Xiangyun CHEN Nanping Tsinghua University , Beijing , China Dept.of Materials Science and Engineering , Huazhong University of Science and Technology , Wuhan 430074 , China

金属学报(英文版)

The relation between grain size and strength of the duplex stainless steels and influence of grain size on properties of hydrogen induced cracking in these steels have been investigated. The Hall-Petch relation between grain size and strength of the steels is also followed.The susceptibility to hydrogen induced cracking of the steels increases with increasing grain size.

关键词: duplex stainless steel , null , null

Chen系统的状态变量周期性反馈控制

李开明 , 李亚洲 , 冯维贵 , 林长

量子电子学报 doi:10.3969/j.issn.1007-5461.2007.05.014

采用非线性反馈控制,用附加了带参数的正弦项对Chen系统进行了有效的控制.随着参数k的逐渐增大,系统的动力学行为呈现出一系列的变化.数值研究结果表明:随控制参数的增大,驱动信号的强度渐大,混沌系统由混沌运动到周期轨道,最终到一相点.

关键词: 混沌 , Chen系统 , 不动点 , Lyapunov指数 , 反馈控制

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