共查询到18条相似文献,搜索用时 79 毫秒
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热轧带钢奥氏体再结晶的预测模型 总被引:1,自引:2,他引:1
以物理冶金学理论为基础并参照实验室的实验结果.建立起适合不同热轧工艺条件下发生的奥氏体静态再结晶现象的计算机模型,通过对实测结果与预测结果的对比分析可知:采用后插法来测定静态再结晶分数能够比较准确地反映实际情况;所建奥氏体再结晶模型和实验结果比较吻合。 相似文献
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以实验室模拟CSP连铸连轧工艺制备的热轧硅钢为基板,通过实验室常化、冷轧和初次再结晶退火实验,采用XRD和EBSD技术对样品从热轧到初次再结晶阶段的织构演变进行了研究。结果表明:GOSS晶粒起源于热轧的次表层,沿着次表层到中心层逐渐降低,热轧板中心层主要为{001}110织构。一次冷轧后,次表层存在强的{001}110和{112}110织构;1/4层存在强的{001}110和{112}110以及较强的{111}112织构;中心层则只存在强的{001}110织构。初次再结晶后,硅钢形成了强点{111}112织构的γ织构,GOSS织构再次出现,且分布在{111}112织构周围。GOSS晶粒周围以35°~55°大角度晶界为主,同时还有很高的Σ3和Σ5重合位置点阵。 相似文献
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采用EBSD分析方法,对CSP试验钢冷轧板退火过程中组织转变和再结晶织构的演变进行分析。结果表明,试验用钢的再结晶过程属定向形核,冷轧基体织构主要是成条状的{111}<110>、{111}<112>和{001}<110>取向。新的再结晶晶粒主要是{111}<112>和{111}<110>取向,且两种取向相互生成。在再结晶温度区间有利于形成{111}<110>和{111}<112>取向,在晶粒长大阶段会生成大量的对深冲性能无明显影响的{112}<110>取向转变。因此,控制再结晶温度区间内形成的{111}取向稳定存在而不发生转变,将有利于提高材料的深冲性能。 相似文献
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针对涟钢CSP基板生产的DDQ冷轧冲压板产品,进行了不同工艺制度下的退火实验,比较了不同退火工艺对产品组织和冲压的影响.在此基础上研究出较优的退火工艺制度并用于实际生产,改善了产品的冲压性能.通过本文研究,优化了涟钢的DDQ级冷轧冲压板的退火工艺,提高了钢板深冲性能,基本满足了用户需求. 相似文献
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Siyu Zhao Huiqun Liu Gaoyong Lin Yilan Jiang Jian Xun 《JOM Journal of the Minerals, Metals and Materials Society》2018,70(7):1106-1111
Zirconium alloys are advanced materials with properties that are greatly affected by their crystalline structure. To investigate this, sheets of Zr-1Sn-0.3Nb alloy were hot rolled with different reductions (10%, 30%, 50%, and 60%) at 1023 K and 1073 K to investigate the alloy’s dynamic recrystallization behavior. Recrystallization kinetics was observed via electron backscattering diffraction and transmission electron microscopy, and the results were compared with estimates based on the Johnson–Mehl–Avrami–Kolmogorov (JMAK) equation. The values of the JMAK exponent n and k increased with the rolling temperature. The estimates and microstructural observations of dynamic recrystallization (DRX) kinetics were in good agreement. 相似文献
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5083铝合金热轧板研究 总被引:6,自引:1,他引:6
针对5083铝合金铸锭热轧时出现的开裂缺陷,研究了钠脆机理,分析了钠的来源,给出了解决办法;应用正交设计实验,解决了规定非比例伸长应力不稳定难题;研究了腐蚀机理,提出了提高抗蚀性能的手段。 相似文献
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《金属学报(英文版)》2017,(9)
The dynamic recrystallization behavior of 25 CrMo4 steel was systematically investigated by compression deformation at different temperatures and strain rates on a Gleeble 1500 thermal mechanical simulation tester. The flow curves under different deformation conditions were obtained, and the effects of deformation temperature and strain rate on the appearance of the flow curves were discussed. Based on the experimental flow curves, the activation energy determined by regression analysis was Q = 337 k J/mol, and the constitutive model was constructed. All the characteristic points of the flow curves were identified from the work hardening rate curves(θ=dó/dεvs ó), which were derived from the flow curves. Then, the kinetics model of dynamic recrystallization was determined by combining the Avrami equation with the stress loss resulted from the dynamic recrystallization. With the aid of the kinetics model, the effect of strain on the efficiency of power dissipation was discussed. Furthermore, the optimum parameters for the forging process were determined based on the processing maps. 相似文献