中国低活化马氏体钢CLAM热等静压扩散焊接初步研究

Preliminary study on hot isostatic pressing diffusion welding for China low activation martensitic(CLAM) steel

热等静压扩散焊接由于其独特的优点而被认为是聚变堆包层第一壁及冷却板等复杂结构件的首选制造技术之一。本文对中国低活化马氏体钢CLAM的热等静压焊接进行了初步研究。实验中CLAM钢自身焊接的拉伸性能已经达到母材的水平,但冲击断口为原接合面,且强度较低,X射线能谱(EDS)分析发现冲击断面上有强氧化物形成元素Al、Si、V等富集,初步认为焊接前期处理过程中待焊接面形成的稳定氧化膜导致冲击性能较低。

Hot isotatic pressing diffusion welding （HIP-DW） is deemed as the primary candidate fabrication technique for the first wall （FW） and cooling plates （CP） of the blanket module. Preliminary experiments on HIP-DW for CLAM were done and discussed in this paper. In these experiments, tensile properties of HIP-DW joints of 1 100℃/140 MPa/4 h and 1 150℃/140 MPa/4 h were identical to base metal, but the impact absorbed energy were very low and the samples all fractured at the joining interface. Elements prone to form oxides such as Al, Si, V etc. were found to be enriched on the fractured surface through energy dispersive X-ray spectroscopy （EDS）, which indicated that the stable oxide film formed during the pre-HIP treatment lowered toughness of the joints.