The oxidation characteristics of high speed steel (HSS) were studied at 500 to 800°C. The non-isothermal oxidation and isothermal oxidation (500, 575, 650, 725, 800°C) of HSS were investigated by thermo-gra...The oxidation characteristics of high speed steel (HSS) were studied at 500 to 800°C. The non-isothermal oxidation and isothermal oxidation (500, 575, 650, 725, 800°C) of HSS were investigated by thermo-gravimetric analysis (TGA). The microstruc- ture, morphology and oxide scale thickness of the isothermal oxidation samples were analyzed by optical microscope (OM), electron probe micro analyzer (EPMA), X-ray diffraction spectrum (XRD) and scanning electron microscope (SEM). The results indicate that the oxidation rate of HSS is very slow at 500 to 650°C, increasing gradually at 650 to 750°C, and drastically at 750 to 800°C, be- cause the phase transformation happens at about 750°C.展开更多
Ecological environment protection will and should not stop as regional public goods;instead, it has been gradually regarded as global public goods. That is why the responsibilityof environment protection belongs to pu...Ecological environment protection will and should not stop as regional public goods;instead, it has been gradually regarded as global public goods. That is why the responsibilityof environment protection belongs to public institutions: government organizations (GO)and non-government organizations (NGO). The ecological environment protection problemsin Chinas rural areas stem from the absence of government responsibilities with regard toconsensuses on issues of rural public goods that are basically sourced from two superstitionson the governments development paradigm: one is attaching too much importance oneconomic growth; the other is relying entirely on market resource-allocation capacity.These two superstitions of Chinas government obviously lead to the shortage of publicgoods in rural areas. It is necessary that GOs and NGOs clearly define their specificresponsibilities, reflect on the development paradigm; establish a more scientific developmentmodel, and take concrete actions based on it.展开更多
基金This research was financially supported by the National Natural Science Foundation of China (No.50274028) and the Major StateBasic Research Development Program of China (973 Program No.G19990650).
文摘The oxidation characteristics of high speed steel (HSS) were studied at 500 to 800°C. The non-isothermal oxidation and isothermal oxidation (500, 575, 650, 725, 800°C) of HSS were investigated by thermo-gravimetric analysis (TGA). The microstruc- ture, morphology and oxide scale thickness of the isothermal oxidation samples were analyzed by optical microscope (OM), electron probe micro analyzer (EPMA), X-ray diffraction spectrum (XRD) and scanning electron microscope (SEM). The results indicate that the oxidation rate of HSS is very slow at 500 to 650°C, increasing gradually at 650 to 750°C, and drastically at 750 to 800°C, be- cause the phase transformation happens at about 750°C.
文摘Ecological environment protection will and should not stop as regional public goods;instead, it has been gradually regarded as global public goods. That is why the responsibilityof environment protection belongs to public institutions: government organizations (GO)and non-government organizations (NGO). The ecological environment protection problemsin Chinas rural areas stem from the absence of government responsibilities with regard toconsensuses on issues of rural public goods that are basically sourced from two superstitionson the governments development paradigm: one is attaching too much importance oneconomic growth; the other is relying entirely on market resource-allocation capacity.These two superstitions of Chinas government obviously lead to the shortage of publicgoods in rural areas. It is necessary that GOs and NGOs clearly define their specificresponsibilities, reflect on the development paradigm; establish a more scientific developmentmodel, and take concrete actions based on it.
