Shude Ji Liguo Zhang Xuesong Liu Jianguo Yang
材料科学技术（英文）
On basis of the subsection welding and the local heating´s reasonable technological parameters obtained by plane experiment, the welding residual stress field of some Francis turbine runner is regulated and controlled. For the experimental plane with a thickness of 16 mm, the effect of subsection welding on decreasing welding residual stress of the prior welding section is obvious when the distance is less than 50 mm away from the end of latter welding section. For the local heating, the best position, where the effect on decreasing the welding residual stress of plane is best, is 60 mm or so away from the edge of heating area. The experimental results of runner show that the subsection welding can make the residual compressive stress engender in the blade dangerous area while the stress value is greatly influenced by the length of the welding section of blade outlet. The local heating can further decrease the value of residual stress near blade outlet, while the local heating processed after heat treatment is better than that processed before heat treatment.
关键词:
Blade
戴礼智
金属学报
<正> 1974年,李约瑟教授赞誉《古代中国科学对世界的影响》时,引用17世纪培根(Francis Bacon)曾指出印刷术、火药和指南针的发明,改变了全世界事物的面貌和状态,又从而产生了无数的变化。但据考古学者考证,我国在指南针发明之前,早已有一种指南器,名曰司南。下列文献均有记载: 《韩非子,有度篇》:“故先王立司南以端朝夕”。 《鬼谷子》:“郑人取玉,必载司南,为其不惑也”。
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