Temperature- and time-dependent behavior of Z2CN18.10 stainless steel under uniaxial loading
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Temperature- and time-dependent behavior of Z2CN18.10 stainless steel under uniaxial loading Gang Chen1 · Shaowu Feng1 · Weiwei Yu2 · Jun Zhang3 · Xu Chen1 · Qiang Lin1
Received: 19 November 2019 / Accepted: 29 September 2020 © Springer Nature B.V. 2020
Abstract A series of uniaxial monotonic tensile tests were first conducted on the piping specimens of Z2CN18.10 stainless steel within the temperature range from 20°C to 350°C at different strain rates. The results show an interesting characteristic of the material: it exhibited obvious rate-dependence at room temperature, whereas at 350°C no such significant dependence was observed. Then some tests were performed within the same temperature range to explore the effect of this property on the uniaxial ratcheting behavior of Z2CN18.10 steel. The results reveal that with increasing temperature the ratcheting behavior of the material tended toward shaking-down and became less sensitive to loading rates and peak dwell time. Such temperature-dependent viscoplasticity of the material can presumably be attributed to the dynamic strain aging (DSA) effect, which results in more loss of viscosity of the material as temperature increases. Keywords Uniaxial tensile · Uniaxial ratcheting · Temperature-dependent viscoplasticity · Dynamic strain aging
1 Introduction Pipeline safety of process equipment system plays an important role in PWR of nuclear power plant and various chemical industries. The main auxiliary piping of a nuclear power plant may be subjected to periodic loads due to changes in plant startup and shutdown, operating conditions, or seismic events. Therefore, the periodic plastic deformation of pipeline becomes inevitable (Liu et al. 2019; Shi et al. 2013; Wang et al. 2013b). One of the phenomena of cyclic plasticity is ratcheting, which is defined as the accumulation of strain under the cyclic load controlled by stress (the average stress is not zero). In many application cycles, the generation and accumulation of this strain will lead to premature failure of
B Q. Lin
[email protected]
1
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
2
Suzhou Nuclear Power Research Institute, Suzhou 240051, China
3
School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou 450001, China
Mech Time-Depend Mater
components and have an adverse effect on their fatigue performance. Therefore, in order to effectively design and maintain the integrity of the structure, it is necessary to understand the cyclic plastic deformation response in detail (Chen et al. 2013b; Fatoba and Akid 2018; Wyon and Valignat 1985). Because of these complex loads, ratcheting deformation of elbow pipe will occur. When the plastic deformation reaches a certain limit, the pipes will fail to be used. It is reported that many factors will greatly affect the ratcheting behavior of pipeline components, such as internal pressure, load type and ambient temperature. Demand for safety design of every single component in nuclear power plants is ever
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