核级不锈钢管座焊接区与母材区疲劳裂纹扩展性能对比研究
doi: 10.13832/j.jnpe.2021.03.0096
Comparative Study on Fatigue Crack Growth Performance of Nuclear Stainless Steel Weld Joints and Base Metal
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摘要:
焊接接头广泛应用于核电站管座处,而疲劳裂纹扩展是导致焊接接头失效的重要原因之一。因此,研究焊接区材料的疲劳裂纹扩展和寿命预测方法对准确预测焊接接头的寿命具有重要意义。本文以核电厂常用的304L不锈钢焊缝材料为对象,研究不同载荷比、不同取样方向对疲劳裂纹扩展速率的影响;基于试验数据建立焊缝材料的疲劳裂纹扩展速率模型,并与美国机械工程师协会(ASME)标准中奥氏体钢进行对比。结果表明:不同取样方向对焊缝疲劳裂纹扩展速率的影响不大,但载荷比对其有较大影响,较低载荷比下,焊缝的疲劳裂纹扩展速率在某个应力强度因子幅值(?K)前高于母材的疲劳裂纹扩展速率,在其之后则低于母材,而较高载荷比下则恰恰相反。
Abstract: Welded joints are widely used on the pipe sockets in nuclear power plants, and fatigue cracks are one of the important causes resulting in the failure of welded joints. Therefore, it is of great significance to study the fatigue crack propagation and life prediction methods for welding zone materials to accurately predict the life of welded joints. This paper takes the commonly used 304L stainless steel weld material in nuclear power plants as the object to study the effects of different load ratios and different sampling directions on the fatigue crack growth rate. Based on the test data, the fatigue crack growth rate model of the weld material is established, and it is compared with the austenite steel in ASME standard. The results show that different sampling directions have little effect on the fatigue crack growth rate of the weld, but the load ratio has a greater impact on it. At a lower load ratio, the fatigue crack growth rate of the weld is higher than that of the base metal before a certain ?K value, and thereafter it is lower than that of the base metal thereafter, but vise versa with higher load ratios.-
Key words:
- Weldedjoint /
- Fatigue crack growth /
- Load ratio
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