Study of Non-proportionally Multiaxial Cyclic Deformation Behavior of Domestic 508-3 Steel at Different Temperatures
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摘要: 国产508-3钢是压水反应堆压力容器的关键材料，为了研究国产508-3钢不同温度下的非比例多轴循环变形行为，本文在25、200和350℃下，对国产508-3钢开展了多轴非比例路径下应变控制和应力控制的全寿命疲劳试验。试验中采用了沙漏形和蝶形的非比例路径，揭示了材料在不同加载路径和不同加载条件下的循环变形特征和棘轮变形行为。研究表明，国产508-3钢的非比例多轴循环变形行为具有明显的温度相关性，由于动态应变时效效应影响，在350℃时材料表现出循环硬化或稳定的特征。Abstract: Domestic 508-3 steel is the key material for the pressure vessel of pressurized water reactor. To study the non-proportionally multiaxial cyclic deformation behavior of domestic 508-3 steel at different temperatures, whole-life fatigue tests under multiaxial non-proportionally path with strain and stress controlled were performed on domestic 508-3 steel. Hourglass type and butterfly type non-proportionally paths were chosen in the tests, which revealed cyclic deformation characteristics and ratcheting behavior under different loading paths and different loading conditions. Results show that notable temperature dependent non-proportionally multiaxial cyclic deformation behavior of domestic 508-3 steel can be observed, and due to the effect of dynamic strain aging, the material exhibits cyclic hardening or stable characteristic at 350℃.
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Key words:
- 508-3 steel /
- Non-proportionally /
- Different temperatures /
- Cyclic deformation.
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图 3 等效应力随循环次数演化曲线
N—为循环周次
Figure 3. Evolution Curves of Equivalent Stress with Number of Cycles
图 4 沙漏形非比例多轴路径下的应力循环实验加载路径
Figure 4. Loading Path of Stress Cycling Experiment under Hourglass Type Non-proportionally Multiaxial Path
图 5 轴向棘轮应变随循环次数演化曲线（沙漏形）
Figure 5. Evolution Curves of Axial Ratcheting Strain with Number of Cycles (Hourglass Type)
图 6 多轴应力循环实验加载路径（蝶形）
Figure 6. Loading Path of Multiaxial Stress Cycling Experiment (Butterfly Type)
图 7 轴向棘轮应变随循环次数演化曲线（蝶形）
Figure 7. Evolution Curves of Axial Ratcheting Strain with Number of Cycles (Butterfly Type)
表 1 实验加载方案
Table 1. Experiment Loading Scheme
试验
温度加载
方式加载
波形加载条件 20℃ 应变
循环沙漏形 等效应变幅值0.6%，等效应变率0.002/s 200℃ 应力
循环蝶形 轴向100±200 MPa，扭向0±264.56 MPa，
应力率100 MPa/s350℃ 沙漏形 轴向100±200 MPa，扭向0±264.56 MPa，
应力率100 MPa/s
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