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山西省自然科学基金(20021002)

作品数:4 被引量:9H指数:2
相关作者:燕居让刘桂荣杨明俊李金仙胡晓玲更多>>
相关机构:山西大学更多>>
发文基金:山西省自然科学基金国家自然科学基金更多>>
相关领域:理学一般工业技术金属学及工艺更多>>

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Effect of Phosphorus on Stress Rupture Properties of GH4133 Ni-Base Superalloy被引量:2
2003年
The effect of phosphorus on the stress rupture property of GH4133 alloy has been investigated and is compared with that of IN718 alloy. The GH4133 alloy is crept by dislocation movement. Phosphorus has a tendency to prolong the rupture life of some wrought superalloys by inhibiting the dislocation movement. If the phosphorus addition is too high, its effect on impairing the grain boundary cohesion overwhelms that on inhibiting the dislocation movement, and the life of the GH4133 alloy can be shortened. The two functions of inhibiting the dislocation movement and impairing the grain boundary cohesion determine that the optimum phosphorus content in the GH4133 alloy is around 0.011 wt pet. Phosphorus exhibits a greater effect on prolonging the rupture life of IN718 alloy than that of GH4133 alloy. The two alloys are crept by different mechanisms. The intergranular phosphorus-bearing phase is precipitated in the IN718 alloy, while not in the GH4133 alloy. The precipitation of the phosphorus bearing phase can balance the phosphorus segregation at the grain boundaries and allows a more remarkable effect of phosphorus on extending the rupture life of IN718 alloy.
Wenru SUN+, Shouren GUO, Baiyun TONG, Dezhong LU, Yan XU, Xiaona MENG, Na LI and Zhuangqi HUDepartment of Superallovs, Institute of Metai Research, Chinese Academy of Sciences, Shenyang 110016, China
关键词:PHOSPHORUS
时滞捕食-食饵系统正周期解的存在性被引量:1
2006年
讨论了多物种生态系统全局周期解的存在性,研究了一类捕食者无密度制约、食饵具有功能性反应函数的时滞捕食-食饵系统.利用重合度理论中的延拓定理,得出了该系统正周期解存在的充分条件,并且推广和改进了一些已知结果.
胡晓玲郑龙飞燕居让
关键词:捕食-食饵系统正周期解重合度
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