中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
Vol. 21 Special 1 March 2011 |
hybrid titanium-to-stainless steel joint
(Nuclear Materials Research Division, Korea Atomic Energy Research Institute, Daejeon 305-353, Korea)
Abstract:The microstructures of the brazed joints for commercially pure Ti and stainless steel were investigated by the applications of various filler alloys including Ag-, Ti-, Zr- and Ni-based alloys. Generally, the dissimilar joints between Ti and stainless steel were dominated by the Ti-based intermetallic compounds (IMCs), e.g. (Ti, Zr)2(Fe, Ni), TiFe, TiCu, and Ti2(Fe, Ni), due to a significant dissolution of Ti from the base metal. The (Fe-Cr) s phase was also observed near the stainless steel due to a segregation of Cr into the interface region. This research demonstrates empirically that the brittleness of the Ti and stainless steel joint can not be avoided only by applying single braze alloy or single insert metal, and thus an introduction of additional suitable interlayer between the filler alloy and the base metal is necessary to prevent the brittleness of the joint.
Key words: brazing; titanium; stainless steel; intermetallic compounds (IMCs)