| 1. | The cyclic hardening behavior under different loading paths and different load conditions was studied
讨论了材料在不同加载路径及不同工况下的循环硬化特性。 |
| 2. | The results showed that the characteristics of cyclic hardening or softening depend to the strain loading paths and the loading parameters
研究结果表明，低周拉扭疲劳加载下，拉与扭应加响应的硬化与软化特性取决于应变加载路径和加载参数。 |
| 3. | In addition , the cyclic softening under the strain amplitude less than 0 . 8 % can be explained by " grain - rotation induced cyclic softening " , and the cyclic hardening in the higher strain amplitude was attributed to twinning
在低应变幅区，合金在室温下的低周疲劳性能明显优于在400下的低周疲劳性能。但随着应变幅的增加，室温和400下合金的疲劳寿命趋于接近。 |
| 4. | Through research into the low - cycle fatigue behavior of gh4145 / sq , we found out that the control of strain at any level is not a stable course but has three obvious stages . the first stage is a rapid cyclic hardening course for any strain control
对gh4145 / sq合金在总应变幅控制下的对称拉压低周疲劳研究表明：在循环形变过程中合金主要表现为初始疲劳硬化、随后疲劳软化及最终失稳断裂三个阶段，疲劳硬化软化行为与作用应变幅相关。 |
| 5. | For the cyclic deformation under a given strain at room temperature , cyclic softening is usually displayed till to failure in the lower range of strain ; however , cyclic hardening is displayed in the early stage in the higher range of strain , subsequent cyclic softening in the later stage and till to failure
对于室温下恒应变幅的循环变形，在应变幅较低时表现为循环软化直至疲劳破坏;在应变幅较高时，循环变形的初期为循环硬化，随后是循环软化直至疲劳破坏。 |
| 6. | The alloys , which were cold - worked followed by recrystallization annealing , display cyclic softening in the range of low strain because the cyclic stress - strain curve lies below the monotonic stress - strain curve , and show cyclic hardening in the range of high strain because the cyclic stress - strain curve lies above the monotonic stress - strain curve
在低应变范围，冷加工后经再结晶退火处理的错合金的循环应力一应变曲线位于单调拉伸曲线的下方，表现为循环软化;在高应变范围则位于单调拉伸曲线的上方，表现为循环硬化。 |
| 7. | The lcf behavior of a recrystallized zircaloy - 4 plate at room temperature and 400 show that alloy has better lcf property at rt than at 400 , and cyclic hardening at 400 which could be attributed to the dynamic strain aging effects . it is noticeable that the hydrided plate has the same cyclic behavior as the above unhydrided sample at room temperature
在400下，合金表现出与常温下不同的循环特性，其循环稳定滞后回线出现锯齿状波形，且在整个疲劳过摘要程中呈现出一致循环硬化的现象，这主要是因为合金在400下发生动态应变时效效应的结果。 |
| 8. | The last stage is a rapid softening course for all strain amplitude . further metallic phase shows : for all strain - controlled , the initial rapid cyclic hardening results from the strong interaction between precipitate strengthening phase and the dislocation ; as for strain amplitude lower than 0 . 95 % , the shearing of precipitate strengthening phase leads to the cyclic softening behavior
金相组织结构检查进一步表明，循环塑性应变作用将显著改变原始态合金中沉淀颗粒的几何形状、尺寸和分布状态，并由此改变位错与颗粒之间的交互作用行为，这一机制将对合金的循环硬化和软化起促进作用。 |
