Study on dynamic strain aging and thermal aging on mechanical behavior of Alloy 709 using an improved unified viscoplastic constitutive model

IF 3.5 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping Pub Date : 2025-07-26 DOI:10.1016/j.ijpvp.2025.105613

Xiaohui Chen, Xu Zhao, Xiaodong Cui, Xiaoyue Zhang

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引用次数: 0

Abstract

Taking Alloy 709 for Sodium-cooled Fast Reactor (SFR) operating conditions as the research object, an improved unified viscoplastic model (UVM) is established to simulate the uniaxial tension at the temperature range of 25 °C–800 °C and the cyclic viscoplastic behaviors at 550 °C and 650 °C for different ageing time. Within the temperature range 455∼650 °C, the dynamic strain aging (DSA) effect is found. Therefore, the influence of operating temperature on the mechanical behavior of Alloy 709 was introduced through an exponential function into the dynamic recovery of the hardening framework. Moreover, the influences of DSA effect and aging times on the yield stress and the kinematic hardening parameters are also considered into the UVM to realize the change of mechanical behaviors of the material under thermal aging conditions. To assess the accuracy and the predictive capability of the improved UVM, uniaxial tension tests at the temperature range of 25 °C–800 °C, and CFI tests at 550 °C and 650 °C are conducted under the ageing time, 100h and 2000h, respectively. A good correlation is obtained between the simulated results and the experiment data.

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采用改进的粘塑性统一本构模型研究709合金动态应变时效和热时效对力学行为的影响

以709合金钠冷快堆（SFR）工况为研究对象，建立了改进的统一粘塑性模型（UVM），模拟了709合金在25℃~ 800℃温度范围内的单轴拉伸以及不同时效时间下709合金在550℃和650℃的循环粘塑性行为。在455 ~ 650℃的温度范围内，发现了动态应变老化（DSA）效应。因此，通过指数函数将操作温度对709合金力学行为的影响引入到硬化框架的动态恢复中。此外，UVM还考虑了DSA效应和时效时间对屈服应力和运动硬化参数的影响，实现了材料在热时效条件下力学行为的变化。为了评估改进的UVM的准确性和预测能力，分别在老化时间100h和2000h下，在25°C - 800°C温度范围内进行单轴拉伸试验，在550°C和650°C温度下进行CFI试验。仿真结果与实验数据具有较好的相关性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Pressure Vessels and Piping 工程技术-工程：机械

CiteScore

5.30

自引率

13.30%

发文量

208

审稿时长

17 months

期刊介绍： Pressure vessel engineering technology is of importance in many branches of industry. This journal publishes the latest research results and related information on all its associated aspects, with particular emphasis on the structural integrity assessment, maintenance and life extension of pressurised process engineering plants. The anticipated coverage of the International Journal of Pressure Vessels and Piping ranges from simple mass-produced pressure vessels to large custom-built vessels and tanks. Pressure vessels technology is a developing field, and contributions on the following topics will therefore be welcome: • Pressure vessel engineering • Structural integrity assessment • Design methods • Codes and standards • Fabrication and welding • Materials properties requirements • Inspection and quality management • Maintenance and life extension • Ageing and environmental effects • Life management Of particular importance are papers covering aspects of significant practical application which could lead to major improvements in economy, reliability and useful life. While most accepted papers represent the results of original applied research, critical reviews of topical interest by world-leading experts will also appear from time to time. International Journal of Pressure Vessels and Piping is indispensable reading for engineering professionals involved in the energy, petrochemicals, process plant, transport, aerospace and related industries; for manufacturers of pressure vessels and ancillary equipment; and for academics pursuing research in these areas.