河北联合大学轻工学院冶金专业毕业设计文献翻译(编辑修改稿)

河北联合大学轻工学院冶金专业毕业设计文献翻译(编辑修改稿)内容摘要：

eel bad [35, 4]. 2) the inclusion of sex and the influence of the steel model toughness Nonmetallic inclusions as often as the birthplace of microcracks and one in which plays an important role, its expression is make steel and elongation area reduction reduced. Particle inclusion often as source of stress concentration, in lower 河北联合大学轻工学院 steel impact toughness values of the steel and the brittle transition temperature rise. 3) of the inclusions steel fatigue performance influence Steel for inclusion in the influence of the fatigue performance of one of the main factors of inclusion is deformation capacity. If the inclusions deformation capacity is low, the steel basic and inclusion in the interface may generate micro cracks, the fine cracks had bee the birthplace of fatigue crack. 4) inclusion of steel pressure influence on the performance of the processing Except in steel exist on a low melting point from the steel inclusions in the thermal deformation processing may result when the hot fragile phenomenon, nonmetallic inclusions in steel can reduce steel at room temperature of plastic and must make the cold steel deformation property damage. 5) inclusion of steel corrosion resistant performance influence The corrosive medium in work or surface is attached to the corrosive medium of steel parts, when the surface of existing nonmetal inclusions, due to nonmetallic inclusions and steel substrate electrode parts of a different corrosion micro cell [37], will be in nonmetallic inclusions in the boundary of the steel basic and electrochemical corrosion occurred. 6) inclusion of influence on the performance of the steel heat treatment Nonmetal inclusions in steel is usually heattreatment quenching cracking when the one of the main reasons. This is because inclusion in steel destroyed the continuity. 7) inclusion of steel welding performance influence Nonmetallic inclusion of steel welding influence on the performance of the main product is easy to cause in the weld seam or heat affected zone crack. Steel of the nonmetallic inclusions in the study Good quality of metal materials not only meet the technical standard chemical position of requirements, nonmetallic inclusions in the material also wants as far as possible less, because even a small amount of nonmetal inclusion also can affect the mechanical properties of the metal, reduce the material quality. These slab of the nonmetallic inclusions destroyed the continuity of the steel and dense sex, the quality of the products of metal has a very important impact. In the continuous casting slab more nonmetallic inclusions, quenching will stress concentration and cause crack, reduce fatigue strength, and even to make the work directly scrap, the existence of the 河北联合大学轻工学院 inclusion, can make the parts in the corrosive medium in inclusion in place causes corrosion. Nonmetallic inclusion of metal materials quality affects not only depends on the amount of and the position of the inclusions and, appearance and distribution state relevant。 The appearance of adverse distribution, such as: the distribution of grain boundaries, chains, be rolling into strips of inclusion of mechanical properties of especially big influence. Under external force often nonmetal inclusions in existing local stress concentration, when stress is big enough to broken material. So inclusion types, content and distribution is usually think that assess the quality of steel products is one of important index, and is listed as highquality steel and high quality steel factory routine inspection programs. Continuous casting solidification speed, inclusion floatation and there too scattered, continuous casting steel and refractory slag contact, the opportunity is exposed to the air, so, mingled with plicated source, according to the research results of the past, and put forward the inclusion of source, type and reduce the inclusion of the measures. Inclusion source According to the steel smelting process, in the following each link may cause of billet inclusions produce [and] : 1) the steel slag converter The effect of the steel slag relatively poor when the steel slag ladle into the more, plus used ladle some not too clean, when many of the steel slag wrapped in the molten steel with clip, polluted the molten steel. Some furnace times blowing refining is not good, direct pouring, of deoxidizing products and a suspension of the molten steel slag can39。 t fully rise, also caused the molten steel pollution [23] [3]. 2) ladle, middle bag that lining erosion In the process of production of ladle lining things into erosion if molten steel, especially when the temperature in the ladle finer LF the knot of material erosion, can cause molten steel ladle lining erosion pollution. A large number of tundish stuffing (clay brick powder) and insulating board of molten steel in the pollution, and the filling of the tundish pollution extremely easily through the dipped into the molten steel nozzles into mould, by the formation of the inclusion size is also the biggest, the destruction of the performance of the steel also the most obvious. In addition, pouring later coating erosion after appearing, tundish knot into the molten steel material 河北联合大学轻工学院 erosion and cause pollution. 3) the molten steel secondary oxidation The molten steel tundish by big pack to should be adopted to protect the seal, but in actual use, the upper steel flow tend to show in the air and cause the second oxidation. And in the course of oxygen and high pressure casting in the protection of the walls of the steel and the formation of oxide NingRu mould easily into the solidified shell. Finer blow argon, if only pursue rapid cooling or shorten refining time, can make the argon gas pressure is too high, make big pack liquid surface flipp。