共查询到18条相似文献,搜索用时 203 毫秒
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基于Deform 3D平台,对钛合金大型框锻件等温成形过程进行了数值模拟,分析研究了变形工艺参数(变形温度、变形速度及摩擦)对变形均匀性的影响。引入变形均匀性参数对变形均匀性进行分析,结果表明:变形工艺参数对TC4钛合金大型框锻件等温成形过程具有显著影响,在锻件成形过程中应适当增加变形温度、降低加载速度和保持良好的润滑条件,以期提高坯料变形的均匀性。 相似文献
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基于热力学软件JMatPro对55NiCrMoV7钢的平衡相图、连续加热奥氏体化曲线(TTA图)、过冷奥氏体连续冷却曲线(CCT图)进行了计算,并模拟了冷却速率对钢微观组织和力学性能的影响,为热锻模具的热加工工艺优化提供指导。同时,为优化使用该钢种的某铝合金框类锻模调质工艺参数设计,基于所获得的热处理参数和DEFROM-3D软件,建立了该锻模的调质过程有限元模型并进行了数值模拟,分析了调质过程锻模的温度场、变形场及组织场变化,基于模拟结果对锻模的回火温度进行了优化,以期实现该热锻模具的热处理生产质量优化。 相似文献
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介绍了液压油缸缸筒用钢管的技术条件要求,分析了原有调质热处理工艺效果较差的原因,提出了新的调质热处理工艺,即在调质前对钢管采取先期完全消除应力、稳定组织的热处理工艺,防止钢管调质时产生变形;然后再采取调整材料综合力学性能的调质(淬火+回火)热处理工艺,使钢管具有强度(硬度)高、耐磨性好、塑性强、承受压力大、脱碳少、微变形等综合性能优势。采取此新工艺后,所生产钢管满足了液压油缸缸筒的技术条件要求。 相似文献
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根据实际生产形势以及热处理设备的现状。采用转炉热处理调质工艺方案代替传统的调质工艺方案对加氢简节锻件进行批量化生产作业。在确保产品质量的同时.极大地提高了生产效率。 相似文献
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蒋勇平 《热处理技术与装备》2009,30(6):39-42
实验中首先设计了不同温度的淬火工艺,得出了9Cr2Mo钢得到最大洛氏硬度下的淬火工艺,同时得出9Cr2Mo钢在水和油中都能淬透;再研究不同回火工艺对9Cr2Mo钢洛氏硬度的影响,得出结果:9Cr2Mo钢的洛氏硬度随回火温度的升高先缓慢下降,当回火温度高于300 ℃时,随着回火温度的升高明显降低. 相似文献
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T. I. Tabatchikova 《The Physics of Metals and Metallography》2008,105(3):275-297
Analysis is given of phase and structural transformations occurring upon ultrarapid laser heating in steels with different initial structures, namely, after annealing, after preliminary quenching, quenching and tempering, and after quenching with subsequent deformation and tempering. It is shown that a significant suppression of diffusion processes occurs during laser heating; this circumstance substantially affects the nature of the phase and structural transformations proceeding during laser processing. Special attention is given to studying the process of recrystallization and to the phenomenon of structural heredity during laser heating. The process of recrystallization during laser heating is considered as consisting of two stages, namely, an ordered lattice rearrangement (α-γ transformation) and the recrystallization of austenite that suffered phase-transformation-induced hardening (“phase naklep”). The effect of tempering and plastic deformation on the recrystallization of a preliminarily quenched steel consists in the intensification of the second stage, i.e., of the recrystallization of the transformation-hardened austenite. It is shown that the α-γ transformation during the laser heating of steels with the initial structure of lath martensite occurs by the “mechanism of recovery,” i.e., via the formation and growth of austenite nuclei. In steels with the initial structure of pearlite, the nucleation of austenite during laser heating can occur by a shear martensite-like diffusionless mechanism with the observance of characteristic orientation relationships between the initial ferrite and the newly formed austenite. 相似文献
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Conclusions The lowering of the transition temperature of rotor steel after quenching and tempering is due to grain refining and an increase of the cooling rate during quenching.Nevskii Machine Construction Factory. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 6, pp. 60–62, June, 1973. 相似文献
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对比研究了在线淬火+回火工艺和传统调质工艺对低碳微合金化船体结构用钢组织和性能的影响,并探讨了其强韧化机制。结果表明,相对于传统调质工艺,采用在线淬火+回火工艺时,控制轧制产生的形变结构提高了在线淬火冷却过程中的相变驱动力和形核率,获得了精细的板条贝氏体组织,并且有利于形成纳米级析出相和高密度位错,从而提高了低碳微合金化钢强度,又保证了良好的低温韧性,总体性能(Rp0.2=599 MPa,KV2(-40 ℃)=272 J/cm2,A=24.5%)达到了590 MPa级船体用钢要求。 相似文献
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Furen Xiao Bo Liao Guiying Qiao Shuzhe Guan 《Journal of Materials Engineering and Performance》2008,17(6):857-863
Thermomechanical treatment as an effective method has been carried out in order to obtain a better combination of high strength
and excellent toughness. In this work, the hot deformation behavior of 86CrMoV7 steel has been studied, and then the process
of ausforging has been designed. The microstructures and mechanical properties of 86CrMoV7 steel by (1) direct quenching after
forging (ausforging) and tempering, (2) quenching-and-tempering and spheroidizing annealing have been investigated. The results
show ausforging-and-tempering provides high strength but same toughness as classical quenching-and-tempering. 相似文献
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通过对偏析现象严重的AISI4130材料进行调质、正火+调质、球化退火+调质三种形式的热处理工艺研究,分析不同热处理工艺对材料性能的影响,确定最佳的热处理工艺是球化退火+调质。 相似文献
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