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钢材的冷却技术,始终是人们研究和应用的课题。以水为代表的沸腾型冷媒,对钢材的表面性状及机械性能有着很重要的作用,其中又涉及到水冷特性及水冷对冷却能力的影响等。新近研制的钢筋自动控制冷却系统是水冷技术的一大进步,尤其适用于带肋钢筋的现场生产,事实证明可改进钢筋的生产工艺和提高产品质量。但对于在生产现场回收钢厂冷却时的热能,目前还处于空白状态。如果在研究钢材冷却技术的同时,又能注意到节能及热量回收,就 相似文献
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通过在中厚板轧机上对WSM30A进行控轧控冷工业试验,研究不同控轧控冷工艺对其组织和性能的影响。结果表明,采取合理的控制轧制方式及轧后冷却速度,可以有效提高钢板的硬度和厚度方向硬度均匀性,并得出WSM30A在现有装备能力条件下的最佳组织形态。 相似文献
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The importance of high‐strength steel concepts for car bodies has increased in the last years due to the need of reduction in weight and enhanced crash safety. It is possible to produce components with a much higher strength, e.g. a tensile strength of about Rm = 1500 MPa, compared to cold forming processes when using press hardening of boron alloyed heat‐treatable steels. Moreover, parts with complex shapes can be realized. Numerical simulation by means of Finite‐Element Method has become an indispensable tool for process design and construction. But for a more realistic prediction of the resulting component properties, for instance residual stresses and distortion, it is essential to consider the complex effects of phase transformation within the simulation. Because it is not a standard task currently, a material model was implemented in the commercial FE‐Code LS‐Dyna. The diffusion‐controlled phase transformation is modelled with Johnson‐Mehl‐Avrami equation for isothermal transformation. The formation of martensite is described by Koistinen‐Marburger equation for diffusionless transformation. The latent heat caused by austenite decomposition is also considered by implementation of a thermal model via a user subroutine. The needed isotherm time‐temperature‐transformation diagram is approximated by a diagram of related steel. These approaches are applied to a simple model process. In this process a round sheet metal is formed and subsequently quenched by cooled tools, therefore a thermal‐mechanical sequential coupled simulation of a model process is implemented. The transport from furnace to the press and the closing of the tools are simulated in order to get a realistic temperature distribution in the sheet metal at the beginning of the forming process. The tools are modelled as deformable bodies and heat‐transfer is taken into account. The simulation results show that nearly the whole austenite is transformed into martensite after the cooling phase. 相似文献
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2Cr13冷作硬化板开发的难度主要在硬度要求及板形控制两方面。通过对轧制工艺的优化,在生产中成功地解决了这两大难题.该产品的成功开发,在创造可观的经济效益的同时,也为我厂2Cr13板材的生产开辟了新的途径,具有较好的市场前景。 相似文献
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连轧GCr15轴承钢的控轧控冷工艺 总被引:5,自引:0,他引:5
大冶特钢用 6 5 0连轧机组 KOCKS轧机 DSC控轧控冷系统生产Φ12~ 72mmGCr15轴承钢 ,DSC水冷控制系统允许来料温差 5 0℃ ,终轧温度控制精度± 10℃。由Φ32mm、Φ4 5mm和Φ4 8mm 3个规格GCr15轴承钢的生产结果表明 ,当钢棒终轧温度控制在 74 0~ 82 0℃ ,轧后快冷至 72 0~ 780℃ ,GCr15轴承钢的网状碳化物≤ 2 .5级 ,组织均匀细小。最佳终轧温度为 74 0~ 75 0℃。 相似文献