一种基于蠕变应变弛豫的S30408深冷容器应变强化保载时间预测方法（英文）

发布时间：2018-04-18 12:47

本文选题：应变强化 + 室温蠕变　；参考：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2017年11期

【摘要】：目的:奥氏体不锈钢(ASS)在深冷压力容器中应用广泛。ASS较高的应变硬化特性有助于其产生应变强化。在应变强化过程中,保载时间是影响材料最终变形量的关键参数。基于室温蠕变应变弛豫理论,本文旨在提出一种S30408深冷压力容器应变强化过程中的保载时间预测方法。创新点:1.根据室温蠕变应变弛豫理论,保载过程即为材料在室温蠕变中应变速率逐渐减缓、材料结构逐渐稳定的过程;本文据此获得了保载时间的计算模型。2.结合材料试验与容器试验,将计算模型中涉及的多个微观变量转换为唯一宏观变量——圆柱壳上的最大环向应力,可为常规工业生产提供定量的、具有实际可操作性的技术支持。方法:1.根据室温蠕变应变弛豫理论,建立蠕变本构关系,得出保载时间计算模型。2.通过材料试验,考虑实际生产中的特定条件,将保载时间计算模型的多个微观变量简化为唯一宏观变量。3.通过在多个工业规模的容器上进行实验,比较验证所提计算方法的可靠性。结论:1.室温蠕变应变弛豫理论可以用于描述应变强化保载过程中的材料变化。2.容器保载时长,即材料应变弛豫时长,与其所承受的最大应力有关。3.所提出的保载时间计算方法可以为容器保载时间提供可靠预测;其平均绝对误差为7.53%,且绝大部分情况下偏于保守。
[Abstract]:Objective: austenitic stainless steel (ASS) is widely used in cryogenic pressure vessels.In the process of strain strengthening, loading time is the key parameter affecting the final deformation of the material.Based on the theory of creep strain relaxation at room temperature, this paper presents a method for predicting the loading time of S30408 cryogenic pressure vessel during strain strengthening.The innovation point is 1: 1.According to the strain relaxation theory of room temperature creep, the loading process is a process in which the strain rate of the material decreases gradually and the structure of the material gradually stabilizes during the creep at room temperature.Combined with material test and vessel test, the microcosmic variables involved in the calculation model are converted into the single macro variable-the maximum circumferential stress on the cylindrical shell, which can provide quantitative analysis for conventional industrial production.With practical operational technical support.Method 1: 1.According to the creep strain relaxation theory at room temperature, the creep constitutive relation is established, and the loading time calculation model. 2.Considering the specific conditions in practical production, several microscopic variables of the loading time calculation model are simplified to the only macroscopic variable.The reliability of the proposed method is verified by experiments on several industrial scale vessels.Conclusion 1.The creep strain relaxation theory at room temperature can be used to describe the material changes during strain strengthening.The holding time of the container, that is, the strain relaxation time of the material, is related to the maximum stress of the vessel.The proposed method can provide reliable prediction for the storage time of the container, the average absolute error is 7.53, and in most cases it is conservative.
【作者单位】： Institute
【基金】：Project supported by the National Key Research and Development Program of China(No.2016YFC0801905)
【分类号】：TG142.71;TH49

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