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ITERTF线圈的CICC导体套管由316LN不锈钢管采用氩弧焊自熔对焊连接而成.选择三种不同的316LN不锈钢管为研究对象,它们分别为母材管、焊接未变形管和焊接后经过8%的冷作变形和650℃下200小时的老化处理的316LN不锈钢管,在室温下对这三种型号的不锈钢管进行拉伸试验,对前两种材料进行冲击试验,同时在4.2K下对焊接变形并经过老化处理的管子进行了拉伸试验,研究了母材与焊缝在室温和4.2K下的力学性能.采用SEM对拉伸断口形貌进行了观察,并采用金相显微镜对焊接未变形管的焊缝进行了观察.结果表明,断后伸长率、屈服强度、抗拉强度、杨氏模量均满足ITER要求,其中4.2K下屈服强度>950MPa,断后伸长率>20%.从拉伸断口形貌的扫描电镜图片可以看出,断口是由大量的韧窝组成,属韧性断裂.室温下焊接未变形管的冲击韧性与母材的相当,焊缝的塑韧性与母材的相当.
ITERTF coil CICC conductor sleeve made of 316LN stainless steel welded tube welding by welding. Select three different 316LN stainless steel tube for the study, they were the parent metal pipe, welded pipe and undeformed deformation after 8% of cold deformation and 650 ℃ 200 hours aging treatment 316LN stainless steel tube at room temperature for these three models of stainless steel tube tensile test, the first two materials were subjected to impact test at 4.2K Tensile tests were conducted on welded deformed and aging tubes to study the mechanical properties of base metal and weld at room temperature and 4.2 K. The tensile fracture morphology was observed by SEM and the microstructure of The results show that the elongation at break, yield strength, tensile strength and Young’s modulus satisfy ITER requirements, of which the yield strength at 4.2K is> 950MPa and the elongation at break is> 20 %. From the scanning electron micrograph of the tensile fracture appearance can be seen that the fracture is composed of a large number of dimples, is a ductile fracture. Undeformed tube at room temperature, the impact toughness of the base metal and the equivalent of the plasticity of the weld and Base metal equivalent.