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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。
The mathematical model of internal temperature field, microstructure and phase transition field and stress-strain field coupling of 30Cr Mo steel large-diameter thick-wall pressure gas cylinder during quenching process was established by using finite element numerical simulation technology. And the inner surface of the radial intermittent spray outer surface of the continuous spraying two kinds of quenching process temperature, microstructure and stress distribution and evolution. The results of numerical simulation show that during the process of immersion water quenching and cooling in the tank, the temperature difference between the inner and the outer surface of the cylinder is large, and there is a large temperature gradient. The stress peak of the cylinder during quenching is relatively large, Large deformation, and the bottle body can not be completely hardened, the amount of martensite changes less; gas cylinder inner surface of the radial intermittent spray spray quenching process can make the inner and outer surface of the cylinder cooling intensity more reasonable, and then reduce the inside and outside Surface temperature gradient, reducing the quenching stress peak, eliminating the quenching deformation, improve its tissue distribution, so as to ensure the uniformity of the bottle body and hardness.