30CrMo钢大直径厚壁压力气瓶淬火过程数值模拟

发布时间：2018-01-16 00:04

本文关键词：30CrMo钢大直径厚壁压力气瓶淬火过程数值模拟　出处：《钢铁》2015年02期 　论文类型：期刊论文

【摘要】：采用有限元数值模拟技术,建立了30Cr Mo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。
[Abstract]:By using finite element numerical simulation technique, a mathematical model of the coupling of internal temperature field, microstructure transformation field and stress strain field of 30CrMo steel large-diameter thick-wall pressure cylinder during quenching process was established. The distribution and evolution of temperature, structure and stress of gas cylinder under two kinds of quenching processes, I. e., water immersion in the tank and continuous spray on the outer surface of the inner surface of radial intermittent spray, are given. The numerical simulation results show that the temperature, microstructure and stress of the cylinder are distributed and evoluted. In the cooling process of tank immersion quenching, there is a large temperature gradient in the cylinder surface temperature, and the peak stress of the cylinder during quenching process is larger, which can easily lead to larger deformation of the cylinder. And the bottle body can not be completely quenched, and the amount of martensite transformation is less. The continuous spray quenching process for the inner surface of the cylinder can make the cooling intensity of the inner and outer surface of the cylinder more reasonable, and then reduce the temperature gradient of the inner and outer surface of the cylinder and reduce the peak value of quenching stress. The quenching deformation is eliminated and the microstructure distribution is improved to ensure the homogeneity of the structure and hardness of the bottle.
【作者单位】：燕山大学国家冷轧板带装备及工艺工程技术研究中心;燕山大学亚稳材料制备技术与科学国家重点实验室;
【基金】：国家冷轧板带装备及工艺工程技术研究中心开放课题资助项目(NECSR-2013) 国家自然科学基金青年基金资助项目(51205342)
【分类号】：TG156.3;TH49
【正文快照】： 随着天然气的广泛应用,对压力气瓶的需求量逐年增加。大直径厚壁压力气瓶的承载压力高,可用于天然气的存储与运输[1]。大直径厚壁压力气瓶属于高压容器,其承载压力高,瓶壁尺寸厚,体积大,制造工艺复杂。压力气瓶长期工作在加载与卸载的疲劳环境中,因此对其强度、塑性和韧性等均

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