Study on Room Temperature Fracture Behavior of Main Pipeline Materials at Medium and Low Loading Rate
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摘要: 核电厂主管道在长期服役下，母材及焊接处可能出现裂纹，需要对主管道材料及焊接材料在中低加载速率下的断裂性能进行研究，避免主管道在强地震冲击下可能出现的双端剪切断裂。基于Instron VHS高速材料试验机，开发了一套材料在中低加载速率下的断裂性能测试方法，测量了核电厂主管道材料控氮00Cr17Ni12Mo2及焊接材料OK Tigrod 316L在0.5 m/s加载速率以内的常温断裂性能。结果表明，常温下核电厂主管道材料控氮00Cr17Ni12Mo2在0.5 m/s冲击速率以内并不启裂，焊接材料OK Tigrod 316L在0.5 m/s加载速率以内的断裂韧性并未出现明显的规律性变化。Abstract: Cracks may occur at the base metal and welding joint of the main pipeline of a nuclear power plant (NPP) during the long-term service. Therefore, it is necessary to study the fracture behavior of the main pipeline material and welding material at medium and low loading rate to avoid the possible double-ended guillotine break of the main pipeline under strong earthquake impact. This study, relying on the Instron VHS high strain rate testing machine for materials, develops a set of testing method for fracture behavior of materials at medium and low loading rate, which in turn is used to measure the room temperature fracture behaviors of main pipeline nitrogen-containing material (00Cr17Ni12Mo2) and welding material (OK Tigrod 316L) within the loading rate of 0.5 m/s in a NPP. As observed from the results, under the room temperature, the main pipeline nitrogen-containing material (00Cr17Ni12Mo2) shows no crack initiation within the impact rate of 0.5 m/s, and the fracture toughness of the welding material (OK Tigrod 316L) indicates no obvious regular change within the loading rate of 0.5 m/s.
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Key words:
- Main pipeline /
- Crack /
- Fracture toughness /
- Dynamic fracture
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图 1 控氮00Cr17Ni12Mo2不锈钢在0.5 m/s加载速率下的试验结果
Figure 1. Testing Results of Nitrogen-Containing Stainless Steel 00Cr17Ni12Mo2 at the Loading Rate of 0.5 m/s
图 2 OK Tigrod 316L在准静态加载下的试验结果
Figure 2. Testing Results of OK Tigrod 316L under Quasi Static Loading Condition
图 3 Instron VHS高速材料试验机压缩断裂试验装置
Figure 3. Compression Facture Testing Equipment of Instron VHS High Strain Rate Testing Machine for Materials
图 4 OK Tigrod 316L焊材三点弯曲试样在准静态加载下的J-R阻力曲线
Figure 4. J-R Resistance Curves of Three-Point Bending Test Specimen from Welding Material OK Tigrod 316L under Quasi Static Loading Condition
图 5 OK Tigrod 316L焊材三点弯曲试样在0.5 m/s速率加载下的J-R阻力曲线
Figure 5. J-R Resistance Curves of Three-Point Bending Test Specimen from Welding Material OK Tigrod 316L at the Loading Rate of 0.5 m/s
表 1 控氮00Cr17Ni12Mo2不锈钢化学成分（质量分数） %
Table 1. Chemical Compositions of Nitrogen-Containing Stainless Steel 00Cr17Ni12Mo2 (Mass Fraction)
元素 C Si Ni Cu Mn Cr Mo N 含量 0.014 0.67 12.02 0.049 1.47 17.53 2.51 0.092 
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表 2 OK Tigrod 316L焊材化学成分（质量分数） %
Table 2. Chemical Compositions of Welding Material OK Tigrod 316L (Mass Fraction)
元素 C Si Ni Cu Mn Cr Mo N 含量 0.016 0.41 12.26 0.077 1.55 18.49 2.52 0.047
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表 3 OK Tigrod 316L焊材在0.5 m/s以内不同加载速率下的JQ0.2、JQ0.5和JQ1
Table 3. JQ0.2, JQ0.5 and JQ1 of Welding Material OK Tigrod 316L at Different Levels of Loading Rate within 0.5 m/s
加载速率/(m·s−1) JQ0.2/(kJ·m−2) JQ0.5/(kJ·m−2) JQ1/(kJ·m−2) 准静态 599 875 1286 0.015 589 781 1227 0.05 616 802 1213 0.15 629 806 1153 0.5 577 722 1069
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