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张鑫 《有色冶金设计与研究》2011,32(Z1)
通过论述铝合金挤压在线淬火的基本原理、工艺参数及其淬火方法和设备,证明铝合金挤压制品在线淬火工艺与传统的离线的淬火炉中淬火相比,简化了工艺流程,缩短了生产周期,提高了生产效率,同时节省了投资和能源.该工艺目前广泛应用于Al-Mg-Si系和A1-Zn-Si系铝合金工业型材的生产. 相似文献
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文章较全面系统地论述了铝合金挤压在线淬火的基本原理与实现在线淬火的工艺条件,并列出了部分常用铝合金的挤压在线淬火参数。铝合金挤压在线淬火是一种先进有效的工艺,可简化工艺流程、提高生产效率。 相似文献
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文章从挤压制品的在线淬火工艺着手,分析了铝挤压材的热处理强化工艺,论述了铝制品在线淬火的优点和实现在线淬火的基本条件;针对不同种类的合金,分析了其对应的在线淬火冷却装置型式以及设计在线淬火装置时需要注意的问题。 相似文献
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《有色金属材料与工程》2016,(6)
2024-O铝型材成形后,需要进行热处理才能达到最终的T62状态.合适的热处理工艺参数会得到性能较理想的最终型材,但是热处理工艺的最佳参数对热处理的工艺控制要求很高,因此很难确定.首先经由2024-O铝型材热处理工艺试验,系统地研究了固溶处理制度、淬火和人工时效制度等工艺因素对合金显微组织和力学性能的影响.其次,采用透射电子显微镜(TEM)和X射线衍射仪(XRD),在微观上研究不同制度下,型材微结构的变化与增强相的析出.最后确定了实验室条件下2024-O状态铝型材T62热处理的最佳工艺参数,即(490~505)℃×(20~40)min+(185~195)℃×(8~14)h.在该制度下,型材合金具备较优的综合性能. 相似文献
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The carburizing process of the gear ring was simulated by taking into account the practical carburizing and quenching techniques of the gear ring and by solving the diffusion equation. The carbon content distribution in the carburized layer was obtained. Based on the results, the quenching process of the gear ring was then simulated using the metallic thermodynamics and FEM; it was found that the carburization remarkably affects the quenching process. Microstructures and stress distributions of the gear ring in the quenching process were simulated, and the results are confirmed by experiments. 相似文献
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30CrMo钢大直径厚壁压力气瓶淬火过程数值模拟 总被引:1,自引:0,他引:1
采用有限元数值模拟技术,建立了30CrMo钢大直径厚壁压力气瓶在淬火过程中内部温度场、组织相变场和应力应变场相互耦合的数学模型,给出了气瓶在槽内浸水与内表面径向间歇喷雾外表面连续喷水2种淬火工艺下的温度、组织及应力的分布与演化规律。数值模拟研究结果表明,在槽内浸水淬火冷却过程中,气瓶瓶体内外表面温度差异较大,存在较大温度梯度,气瓶在淬火过程中的应力峰值较大,容易引起气瓶发生较大变形,且瓶体不能完全淬透,马氏体转变量较少;气瓶内表面径向间歇喷雾外表面连续喷水淬火工艺可使气瓶的内外表面冷却强度更加合理,进而降低其内外表面的温度梯度,减小其淬火应力峰值,消除其淬火变形,改善其组织分布,从而保证瓶体组织和硬度的均匀性。 相似文献
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Feng LU Chao WANG Long L Zhao-dong WANG Guo-dong WANG Raja Devesh Kumar MISRA 《钢铁研究学报(英文版)》2015,22(4):344-351
A high strength low alloy steel with low carbon equivalent was selected for simulating online direct quenching and coiling(DQ-C)process.The influence of stop quenching temperature on mechanical properties and microstructures was studied and compared with normal direct quenching and tempering(DQ-T)process.The study confirmed that required mechanical properties were obtained for both the processes.Properties of the experimental steel with DQ-C process could reach the same level as that of DQ-T process in general.In the DQ-C process,strength decreased with increase in stop quenching temperature.Martensite was obtained and experienced an aging process at stop quenching temperature below Mf.On fast cooling below Ms,martensite was partially transformed and carbon partitioning occurred during slow cooling.The reduction in solid solution carbon and increased amount of retained austenite led to lower strength compared with the DQ-T process.DQ-C process was more favorable for microalloy carbide precipitation.However,impact toughness under different cooling conditions was adequate because of low carbon equivalent and refined microstructure. 相似文献
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A three-dimensional finite element model was established to investigate the water–air online quenching process of 3Cr2Mo steel with 130-mm thickness. The temperature, metallographic structure and stress–strain fields of the steel were calculated under single-pass continuous quenching, multi-pass continuous quenching and multi-pass interrupted quenching (MPIQ) processes. The results show that the three quenching processes can avoid the pearlite appearance, and MPIQ process could be more effective to decrease the brittleness of steel. Besides, MPIQ process is able to reduce stress–strain, minimise deformation and avoid cracking problem. The hardness and the metallographic structure were tested after MPIQ process and tempering. After tempering, the metallographic structures were all tempered sorbite, and the hardness difference of the whole steel was less than 3HRC with no cracks. It can draw the conclusion that the MPIQ process is a suitable quenching process for 3Cr2Mo steel. 相似文献
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介绍了为解决降低钢板淬火水资源浪费,通过开发淬火循环水系统,分析淬火设备控制方法及生产工艺执行操作,节约了水资源,增加了设备的使用效率。 相似文献
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为求解换热系数模型,以大量现场数据与热传递机制为基础,建立换热系数回归模型并使用ANSYS有限元软件对钢板冷却过程进行模拟,获取淬火过程中间数据。通过非线性回归算法对模型参数进行回归计算,最终取得整个淬火过程的换热系数公式。解决了现场无法测量淬火过程温度值,难以求解换热系数的难题。 相似文献
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本文对低水熄焦工艺进行了介绍,并通过对比传统湿法熄焦工艺与低水分熄焦工艺的特点,总结低水分熄焦工艺的先进性与可实施性,并且将其应用于攀钢二期焦炉熄焦工艺改造,取得了明显效果。 相似文献