The stress distribution of Fe3Al/Cr18-Ni8 stainless steel diffusion bonding joint was calculated, the method of numerical simulation and thermo-elastic-plastic finite element method (FEM) were adopted. The results indicated that the stress peak value appeared near the interface of Cr18-Ni8 steel side. This is the key factor inducing crack. With increasing of the heating temperature and time, the stress of Fe3Al/Cr18-Ni8 diffusion bonding joint increased. The largest stress value with a heating temperature of 1100 • C is about 65.9 MPa, which is higher than the stress peak value at 1000 • C by 9.4 %. For a certain arrangement of thickness, the stress is becoming larger with the increasing of the thickness of test plate. When the thickness is beyond a certain critical value (about 8 mm), the stress varies slightly with the thickness. K e y w o r d s: Fe3Al intermetallic, dissimilar materials, diffusion bonding, stress finite element method (FEM)
Diffusion bonding Al2O3-TiC ceramic matrix composites with Cr18-Ni8 austenitic stainless steel has been performed with a Ti/Cu/Ti multi-interlayer. The Al2O3-TiC/Cr18-Ni8 joints were characterized by means of scanning electron microscope (SEM) with energy-disperse spectrometry (EDS), electron probe microanalysis (EPMA) and X-ray diffraction (XRD). The results indicate that the Al2O3-TiC/Cr18-Ni8 diffusion-bonded joint with shear strength of 106 MPa was obtained by using the Ti/Cu/Ti multi-interlayer. An interfacial transition zone was formed by diffusion reaction between Ti, Cu and the elements from the substrates, Al2O3-TiC and Cr18-Ni8. TiO, TiC, α-Cu, CuTi, FeTi and Cr2Ti are produced near the interface of the Al2O3-TiC/Cr18-Ni8 joint. K e y w o r d s : diffusion bonding, Al2O3-TiC ceramic matrix composites, Ti/Cu/Ti multi-interlayer, microstructure, XRD
In this study, Fe3Al intermetallic and Q235 steel were jointed by the vacuum diffusion bonding. The shear strength of the Fe3Al/Q235 interface was analyzed and the interfacial fracture morphology was observed by means of scanning electronic microscope (SEM). The experimental results indicated that the fracture location was on the Fe3Al side, and the shear rupture morphology was the cleavage characteristics with little toughness fracture. Most micro-cracks propagated along the interface near the Fe3Al side and sometimes leaned to the center of the interface. The Fe3Al/Q235 diffusion bonding joint with excellent interface combination and the sufficient shear strength (112 MPa) can be obtained when the heating temperature was 1060 • C, the holding time was 45-60 min and the pressure was 12-15 MPa.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.