共查询到17条相似文献,搜索用时 125 毫秒
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1 概述 随着经济的不断发展,各行各业对中厚钢板的性能及质量要求越来越高,特别是与人民生活及生产、安全密切相关的各种锅炉用板、压力容器用板等中厚板的内在质量,标准中严格规定了不准存在分层、夹杂等钢板内部缺陷。冶金部还实行了锅炉板、压力容器板生产许可证制度。为保证和提高锅炉板、压力容器板等专用中厚板的质量,各厂在原料精选、冶炼工艺优化及控制,如:低硫磷铁水吹炼、炼钢精炼以及轧钢严格控制加热、轧钢 相似文献
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本文建立了C-Mn钢在控制轧制和控制冷却生产中微观组织演变和力学性能预测的物理冶金模型。模型包括加热、再结晶、相变和力学性能四部分,分别描述了中厚板热轧度冷却过程中的物理冶金现象。根据现场数据,计算了轧制过程奥氏体晶粒尺寸和再结晶分数的演变,预测了在不同工艺条件下连续冷却转变各相的体积分数和铁素体的晶粒尺寸等显微组织参数和相关的力学性能,预测结果和实测值吻合较好。 相似文献
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热轧钢材组织和性能预测及控制专家系统 总被引:1,自引:0,他引:1
热轧钢材组织和性能预测及控制专家系统,是在物理冶金理论、轧制理论及计算机应用技术获得进展的基础上建立起来的。该专家系统通常由轧制、相变和性能三个模块组成,可根据性能要求,离线对钢的化学成分、组织和热轧生产工艺参数进行最优化,应用于热轧钢材组织和性能的离线预测、在线预测及在线控制,是一项极有用与崭新的技术。 相似文献
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建立了C-Mn钢在控制轧制和控制冷却生产中微观组织演变和力学性能预测的物理冶金模型。模型包括加热、再结晶、相变和力学性能四部分,分别描述了中厚板热轧及冷却过程中的物理冶金现象。根据现场数据,计算了轧制过程奥氏体晶粒尺寸和再结晶分数的演变,预测了在不同工艺条件下连续冷却转变各相的体积分数和铁素体的晶粒尺寸等显微组织参数和相关的力学性能,预测结果和实测值吻合较好。 相似文献
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根据中厚板生产线实测数据,采用多元线性回归分析方法建立了描述中厚板产品性能与成分和工艺之间关系的数学模型,这些数学模型可以用于产品性能预测和产品开发设计。 相似文献
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介绍了调质钢棒材组织性能预报软件的开发和应用情况,模拟了从轧制到调质整个工艺过程中的温度场、轧制负荷、组织性能、热处理效果等。轧制负荷的计算研究中,考虑了奥氏体再结晶软化不充分对轧制负荷的影响。温度场的计算中,实现了VB和ANSYS之间的相互调用,相变量化分析计算中充分考虑了影响CCT曲线位置的因素,并对CCT曲线进行解析化处理,有效提高了组织转变的预报精度。软件的实际应用表明,无论是热轧态还是调质态,组织性能的预报值均与现场实测值基本相符,对改善产品的组织性能,提高产品合格率,具有重要的参考价值。 相似文献
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A metallurgical through‐process model is presented which describes the microstructural evolution and predicts the final mechanical properties of low carbon steel during hot strip rolling. Process models concern the thermal and deformation phenomena, which take into account the strain, strain rate and temperature distribution along the length of the strip. And the metallurgical models cover five modules, which are (i) austenitization of cast slab in reheating furnace, (ii) recrystallization of austenite in hot rolling, (iii) phase transformation of austenite‐ferrite in laminar cooling on the run‐out‐table, (iv) grain growth after coiling, and (v) final structure‐mechanical properties of products. Temperature is the main parameter and has dominant influence on the microstrutural evolution and the mechanical properties. The related temperature variation in hot strip rolling concerns air cooling, scaling, water cooling, heat transmission by roll contact, heat generation by deformation and friction. These complex factors are incorporated into the thermal models to simulate the temperature distribution along the length of the strip from the reheating furnace exit to the down‐coiler. A self‐learning algorithm is employed to improve the calculation accuracy and the computational temperatures are compared with the measured ones at typical locations. In the structure‐property relationships, two key process parameters (e.g., finishing exit temperature (FT7) and coiling temperature (CT)) are introduced in the model to consider the influence of morphology of microstructure on mechanical properties. 相似文献
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The effect of recrystallization annealing temperature on the properties and microstructure of one-step cold rolled steel strip for shadow mask was studied.The results showed that there was no yield point elongation when the tensile tests were performed on the samples for annealing temperatures ranging from 750℃ to 810 ℃.Moreover,increasing annealing temperature resulted in large grains,which was beneficial to the formability and magnetic property of steel strips.On the other hand,when the sample was annealed at 840 ℃,its microstructure showed ununifortuity with 0.04% yield point elongation,which was not good for the function of the shadow mask.Therefore,the proper recrystallization annealing temperature was about 810 ℃ for the present steel strip for shadow mask. 相似文献
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The effect of the run-out table cooling patterns on the microstructure and mechanical properties of Nb microalloyed steel plates was investigated by hot rolling experiment. The results showed that the mixed microstructure containing ferrite, bainite and significant amounts of retained austenite can be obtained through three kinds of cooling patterns on the run-out table under the same hot rolling condition. Three kinds of cooling patterns possess different austenite transformation kinetics, which leads to variations in microconstituent characteristics. The yield strength increases, the tensile strength decreases and the total elongation tends to increase as the cooling patterns Ⅰ, Ⅱ and Ⅲ were applied respectively. The yield strength, the total elongation and the product of tensile strength and ductility reach the maximum values (547 MPa, 37.2% and 28384 MPa·%, respectively) for the steel plate processed by cooling pattern Ⅲ. 相似文献
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采用拉伸试验、金相、ODF织构分析及电子背散射衍射(EBSD)技术研究了一种冷轧高Nb-IF钢和传统Nb+Ti-IF钢在不同退火温度下的组织性能、织构及晶界特征。结果表明:与传统Nb+Ti-IF钢相比,该新型高Nb-IF钢由于添加了质量分数为60×10-6的碳和010%的铌,其再结晶温度和再结晶完成温度均大幅度提高;新型高Nb-IF钢具有晶粒细小、组织均匀性良好的组织和γ取向织构发展充分且强点密度高的织构,能够获得强度高、伸长率高和r值高的优异的综合性能。EBSD分析结果表明,该新型高Nb-IF钢中小角度晶界和低指数重位点阵(ΣCSL)晶界含量较多,这也是试验钢获得优良成形性能的原因之一。 相似文献