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轻水堆(LWR)环境对压力边界材料疲劳性能的影响,包括疲劳寿命及疲劳裂纹扩展速率对设备核安全是非常重要的。为了预测核材料疲劳寿命,改进核材料设计,对国产材料进行腐蚀环境下的疲劳性能研究以得到模拟环境下的疲劳数据是很有必要的。对国产F316Ti在模拟LWR一回路环境下的低周疲劳性能进行了研究,结果显示,高温水环境是影响奥氏体不锈钢低周疲劳性能的重要因素之一。对于同种材料,高温空气中的低周疲劳性能优于高温水中的低周疲劳性能;高温水中,国产F316Ti与日本奥氏体不锈钢具有同等的抗低周疲劳性能。腐蚀疲劳数据均处于ASME最佳拟合曲线和ASME设计疲劳曲线之间;F316Ti在模拟压水堆(PWR)和沸水堆(BWR)一回路环境中的低周疲劳性能,在高应变范围无明显差异;随着应变幅降低,渐见差异。模拟BWR环境中,数据处于较短寿命侧。由抚顺钢厂生产的F316Ti材料,钛均匀地分布于其中,且材料中Ni,Cr,Mo含量均处于合金化学成分上限。因此,它具有较优越的抗高温水的腐蚀疲劳性能。
The effects of the LWR environment on the fatigue behavior of pressure-boundary materials, including fatigue life and fatigue crack growth rate, are very important for the nuclear safety of the equipment. In order to predict the fatigue life of nuclear materials and improve the design of nuclear materials, it is necessary to study the fatigue properties of domestic materials under corrosive environment to get the fatigue data under simulated conditions. The low cycle fatigue performance of domestic F316Ti under simulated LWR primary loop was studied. The results show that high temperature water environment is one of the important factors affecting low cycle fatigue performance of austenitic stainless steel. For the same kind of material, low cycle fatigue performance in high temperature air is better than low cycle fatigue performance in high temperature water. Domestic high temperature water, domestic F316Ti and Japanese austenitic stainless steel have the same low cycle fatigue resistance. The corrosion fatigue data are between the ASME best fitting curve and the ASME design fatigue curve. The low cycle fatigue performance of the F316Ti in the PWR and BWR primary loop environment is not obvious in the high strain range Differences; As the strain amplitude decreases, gradually see the difference. In a simulated BWR environment, the data is on the shorter life side. The F316Ti material produced by Fushun Steel is uniformly distributed in the titanium and the contents of Ni, Cr and Mo in the material are all at the upper limit of the chemical composition of the alloy. Therefore, it has superior corrosion fatigue resistance to high temperature water.