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 Posted: Sat 5:48, 15 Jan 2011 Post subject: ugg boots günstig Trimming layered plate A36 SEM |
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Trimming layered plate A36 SEM
Hierarchical organization at Figure 3, stratified at inclusion morphology and EDS analysis shown in Figure 4, can be seen from the figure more holes caused by inclusions and micro cracks. Figure 2 Scanning electron micrographs of crack (a) sample 1; (b) sample 2 at the tissue layer in Figure 3 SEM images of 4 Analysis and discussion of the sample can be seen from Table 1 the chemical composition of the standard. Steel, non-metallic compounds in the presence of sulfide, oxide, silicate and nitrogen compounds were tested independent of other phases exist, according to sources within the students are divided into two types of inclusion and foreign inclusions. Endogenous alumina inclusions in steel deoxidation is mainly a product of sulphide, nitride and so on. Generally speaking, if aggregation occurs within the raw mixture, size small, evenly distributed in the steel. More sources of foreign inclusions. In steel smelting, the steel and casting process, and refractories, slag, flux and constant outlet and other contacts at high temperatures, the interface more than the chance of contamination of molten steel, a large bag of sand fell in the drainage bag, such as floating not timely, will remain involved in the molten steel within the slab, the formation of concentrated inclusions. When the molten steel temperature drop too low, or worse when the molten steel flow, continuous casting and casting speed if too fast, molten steel erosion of the interface of the pollutants into the molten steel in a timely manner is difficult to exclude other non-metallic particles, can in steel, large foreign inclusions in the form, or slag u. It can be seen from Figure 4,[link widoczny dla zalogowanych], the starting point at the crack of a large number of mixed classes holes. Class inclusion is due to the formation of holes there is a large slab itself, inclusions, oxides and other inclusions,[link widoczny dla zalogowanych], making the substrate decreased the intensity of local area, leading to discontinuity caused by the metal flow. From the spectrum analysis, the crack at the existence of oxide and silicate inclusions, oxides such as A12O high hardness, plasticity poor,[link widoczny dla zalogowanych], small deformation during rolling, easy to destroy the continuity of the substrate deformation, silicate inclusions during hot deformation in the plastic deformation, but the low temperature deformation in the index is low, when the cold brittleness. Because of holes in the substrate in the inhomogeneous deformation during rolling around one of the normal substrate of uniform deformation, the expansion of non-uniform deformation zone, the other hand, stress concentration and the different coefficients of linear expansion due to the stress produced to promote the development of cracks, resulting in a continuous lamination defects. 5 proposed inclusion content in the continuous casting slab directly determines the level of sheet quality, increase the purity of steel, mainly in the molten steel into the mold to ensure that before, and should be reduced as much as possible endogenous and foreign inclusions. In the actual production process, it is recommended to further improve the quality of argon,[link widoczny dla zalogowanych], using 2003 4 Physics test 15 (l5e1 【n \morphology (a) and composition of the spectrum (b) line diagram of high-quality refractories, reducing spalling, and the adsorption force to protect the casting flux and other strong measures to reduce steel content and level of inclusion, in particular,[link widoczny dla zalogowanych], is the number of inclusions of large particles. strengthen the refined, extended steel stabilization time; stable continuous casting process to eliminate the involvement of flux within the slab, in the liquid steel into the tundish before the full oxygen, and to remove floating deoxidation products, reduce non-metallic inclusions and slag in the billets in the retention, in order to improve the cleanliness of steel. 6 Conclusion (1) within the slab caused by oxide and silicate inclusions is caused by internal cracks in the slab steel trimming layered A36 the main reason. (2) to improve the quality of smelting, the use of high-quality refractory and stable steel continuous casting process to improve cleanliness and reduce the slab's internal cracks. References 1 British. Steelmaking Principles. Beijing: Metallurgical Industry Press, 1980. (continued from page 2O) Table 2 Experimental results nlln can be seen from the measured curves: second load line (D.) curve with the elastic range (D) in parallel, and when the second load unloading part of the cross point in B, indicating that the device in the loading and unloading process, the fixed header is always able to point fastening holes in the sample, and can deform with the sample driven by means of a rod extensometer records the true sample deformation. shows that the device to the return trip of high quality. From the experimental results to see: the results are basically the same, ultimate difference ≤ 0.0002mill, measurement stability. materials require less than 0.2% residual deformation, the results of this trial are in line with requirements 6. Conclusions of the device to reach the entire trial process, the fixed point of the first to tighten the sample does not slide out of Confucius, by means of a driven rod extensometer records the true deformation of the specimen; extensometers forward, return B level precision; the Ar the same test material samples is consistent and stable. References 1 Leung New Gang, Li Jiulin, Zhang Zhenwu. metal mechanical and technological test compilation of national standards, Beijing: China Standard Press, 1996.
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