Abstract:To control the oxide scale on high carbon steel during the manufacture of high carbon steel wire, the structure and the growth process of oxide scale were investigated by using X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM) , Laser Raman Spectroscopy (LRS) and TGA system. Experimental results show that oxide scale on high carbon steel has a three-layer structure. The oxide scale growth on high-carbon steel can divide into three stages. 1) The growth rate is slow below 780°C. 2) The growth rate increases obviously between 780°C and 950°C and 3) sharp increase beyond 1000°C. The oxidation of high carbon steel obeys a linear law at first and a parabolic law is followed with the increase of oxidation time. The oxide temperature has great effected on the thickness of oxide scale. The proportion of wustite in oxide scale increases with both the oxidation temperature and oxidation time.
The research results of magnesium alloys and their applications to the special components are introduced. A new kind of coat system of magnesium alloy was studied, and its conversion film is chromium-free favourable to environment. The base coat and top-coat with good properties were made with special anticorrosive pigments and fillers. The IPN technology was utilized. The coat sy stem passed salt spray test of 700 hours. By microplasma oxidation coating as foundation bed, the fl uoropolymer is indrafted through hot-dip and second electrolyzation. By vacuum heat treatment the wear-resistant,corrosion-resistant,hard synergistic coating is formed. Its thickness is 15 25µm, har dness is 340 370HV0.05 The strain and stress change of deformation in different original textures, the microstructure evolution in deformation of high temperature and low temperature are analyzed. The strengthing by texture was testified. By isothermal forming, casting,etc, some special compone nts are deformed and manufactured, such as water pipes, cartridge receiver, cover plate, filter shell e tc. By putting components in the typical natural environment testing fields the adaptability to environment was studied. Some special components such as cabin framework have been tested.
Since the 21st century, the development of automotive and home appliance industries has greatly contributed to the prosperity of the plastics industry, which has led to an increasing demand for molding molds. In the production process, the molds will be impacted, worn and corroded, especially in the production of plastic products made of PVC, fluoroplastics and flame retardant ABS, etc. The molds will be corroded by the corrosive gases generated such as hydrogen chloride, hydrogen fluoride and sulfur dioxide, which requires plastic molds to have a certain degree of corrosion resistance while ensuring strong toughness.S136 SUP is a modified martensitic stainless steel based on S136 from ASSAB, Sweden, which has fine-tuned the content ratio of some elements to ensure a certain strength and high toughness at the same time. The chemical composition, heat treatment and microstructure of the steel have a certain influence on its corrosion resistance, and the tempering temperature of the heat treatment has a greater influence on the corrosion resistance of martensitic stainless steel. Therefore, in this paper, the microstructure and corrosion resistance of S136 SUP at different tempering temperatures are explored and studied.
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