Mechanical Assessment of Dissimilar Diffusion Joints of CP-Ti to Stainless Steel
Dissimilar joints between CP-Ti and 304stainless steel were produced using diffusion welding technique in the temperature range of 800-950 °C, under a uniaxial pressure of 7 MPa in argon atmosphere. Mechanical assessment of the joints was carried out employing shear testing. The shear strength was found to be a function of joint surface area and volume fraction of brittle intermetallic phases such as σ, FeTi, and Fe2Ti which were detected by scanning electron microscopy and energy dispersive spectroscopy. Increasing the temperature and time of the diffusion welding process increased joint surface area and accelerated elemental diffusion across the joint interface which enhanced the shear strength value. However, as the volume fraction of the brittle intermetallic phases and Kirkendall voids increased at higher temperature and time, the bond shear strength decreased. Optimum shear strength was found to be 168 MPa which related to the joint produced at temperature and time of 900°C and 30 min, respectively.
M.S.J. Hashmi, S. Mridha and S. Naher
M.R. Soltan Mohammadi and S.F. Kashani Bozorg, "Mechanical Assessment of Dissimilar Diffusion Joints of CP-Ti to Stainless Steel", Advanced Materials Research, Vols. 264-265, pp. 1737-1745, 2011