本文選題：應(yīng)變強(qiáng)化 + 室溫蠕變　； 參考：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2017年11期

【摘要】：目的:奧氏體不銹鋼(ASS)在深冷壓力容器中應(yīng)用廣泛。ASS較高的應(yīng)變硬化特性有助于其產(chǎn)生應(yīng)變強(qiáng)化。在應(yīng)變強(qiáng)化過程中,保載時間是影響材料最終變形量的關(guān)鍵參數(shù)�；谑覝厝渥儜�(yīng)變弛豫理論,本文旨在提出一種S30408深冷壓力容器應(yīng)變強(qiáng)化過程中的保載時間預(yù)測方法。創(chuàng)新點:1.根據(jù)室溫蠕變應(yīng)變弛豫理論,保載過程即為材料在室溫蠕變中應(yīng)變速率逐漸減緩、材料結(jié)構(gòu)逐漸穩(wěn)定的過程;本文據(jù)此獲得了保載時間的計算模型。2.結(jié)合材料試驗與容器試驗,將計算模型中涉及的多個微觀變量轉(zhuǎn)換為唯一宏觀變量——圓柱殼上的最大環(huán)向應(yīng)力,可為常規(guī)工業(yè)生產(chǎn)提供定量的、具有實際可操作性的技術(shù)支持。方法:1.根據(jù)室溫蠕變應(yīng)變弛豫理論,建立蠕變本構(gòu)關(guān)系,得出保載時間計算模型。2.通過材料試驗,考慮實際生產(chǎn)中的特定條件,將保載時間計算模型的多個微觀變量簡化為唯一宏觀變量。3.通過在多個工業(yè)規(guī)模的容器上進(jìn)行實驗,比較驗證所提計算方法的可靠性。結(jié)論:1.室溫蠕變應(yīng)變弛豫理論可以用于描述應(yīng)變強(qiáng)化保載過程中的材料變化。2.容器保載時長,即材料應(yīng)變弛豫時長,與其所承受的最大應(yīng)力有關(guān)。3.所提出的保載時間計算方法可以為容器保載時間提供可靠預(yù)測;其平均絕對誤差為7.53%,且絕大部分情況下偏于保守。
[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.
【作者單位】： Institute
【基金】：Project supported by the National Key Research and Development Program of China(No.2016YFC0801905)
【分類號】：TG142.71;TH49

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