主管道材料高温力学性能研究

提供核电厂破前漏（LBB）设计所需材料性能参数需要测量主管道母材和焊接材料在高温下的力学性能（包括材料在地震环境下的高温动态力学性能）。基于万能伺服材料试验机和高速材料试验机测量了核电厂主管道母材控氮00Cr17Ni12Mo2不锈钢及焊接材料OK Tigrod 316L在高温（350℃）下的静动态拉伸力学性能、裂纹扩展率和静动态断裂韧性。与主管道母材和焊接材料的常温力学性能相比，2种材料在350℃下的静动态拉伸力学性能以及OK Tigrod 316L在350℃下的静动态断裂韧性都较常温有较大幅度的降低，2种材料在350℃下的抗裂纹扩展性能较常温略有下降。研究成果可为核电厂管道的LBB设计提供试验技术和材料参数支持。

Research on High Temperature Mechanical Properties of Main Pipeline Materials

In order to provide material property parameters for leak before break (LBB) design of nuclear power plant, it is necessary to measure the mechanical properties of base metal and welding material of main pipeline at high temperature, including the high-temperature dynamic mechanical properties of materials in seismic environment. Based on universal servo material testing machine and high-speed material testing machine, the static-dynamic tensile mechanical properties, crack growth rate and static-dynamic fracture toughness of nitrogen controlled 00Cr17Ni12Mo2 stainless steel and OK Tigrod 316L welding material for main pipeline base metal of nuclear power plant at high temperature (350℃) are measured. Compared with the normal temperature mechanical properties of the main pipeline base metal and welding materials, the static-dynamic tensile mechanical properties of the two materials at 350℃ and the static-dynamic fracture toughness of OK Tigrod 316L at 350℃ have significantly decreased compared with the normal temperature, and the crack growth resistance of the two materials at 350℃ has slightly decreased compared with the normal temperature. The research results can provide experimental technology and material parameter support for LBB design of nuclear power plant pipelines.