The change law of microstructure, physical properties of hydrogenated TC4 titanium alloy is studied. Through cutting experiment, the effect of hydrogen on cutting mechanical properties and cutting tool wear is analyzed.
The tasks for establishing technical specifications for model are described and the problems which may occur in this process are identified. Then three-dimensional frame structure of the reliability -centered system engineering （RSE） technical specifications, contents and the problems that should be paid more attention in practice are prsented. Finally, taking one type of aircraft for instance, the method of diciding the scope and content for RSE technical specifications has been depicted.
The visible spectrum of molybdenum in some common welding material and welds is studied by digital analysis. The researches are made on digital processing and analysis technology of Mo438.16nm and Mo481.93nm line groups. The digital analysis method is developed for spectroscopic analysis of molybdenum in welding material and weld. The results can be used in the qualitative analysis and quantitative analysis on molybdenum in welding material and weld, as well as the material trademark.
Abradable seal coatings are important thermal sprayed coatings widely used in aeroengine and have significance to increase the efficiency and to reduce fuel consumption. The main varieties and development tendency of abradable seal coating materials are introduced, and the evaluation methods of the coating properties are described.
According to the poor surface quality of blisk’s blades processed by the five axis machining center, a novel method to smooth curves and curved surfaces by using UG software is put forward. Relying on this method, the surface modeling becomes more smooth, and the quality of blisk is ensured from the processing source. The test results indicate that the method is convenient and fast. Surface quality of blade improves markedly which shows that it meets the engineering requirements.
