Microstructure and Mechanical Properties of Dissimilar TC4 Titanium Alloy/304 Stainless Steel Joint Using Copper Filler Wire

The Effect of Laser Offset Welding on Microstructure and Mechanical Properties of 301L to TA2 with and without Cu Intermediate Layer

“…When the offset was +0.3 mm, the fluctuation of Ti distribution curve was obvious at the welding seam. In addition, owing to the similar atomic distance between Cu and Fe, the solid solution can be formed easily, more copper atoms would diffuse to 301L side instead of TA2 side (Figure 16c) [22]. Based on the analysis above, the formation of Cu-Ti is better than that of Ti-Fe in the welded joint, but the formation of Ti-Fe brittle phases cannot be completely eliminated.…”

“…When the offset was +0.3 mm, the fluctuation of Ti distribution curve was obvious at the welding seam. In addition, owing to the similar atomic distance between Cu and Fe, the solid solution can be formed easily, more copper atoms would diffuse to 301L side instead of TA2 side (Figure 16c) [22]. Figure 17 shows the map scanning results of elements distribution on the cross-sections of 301L/Cu/TA2 welded joints.…”

“…Finally, the generated Cu 4 Ti 3 continues to undergo a peritectic reaction with the liquid phase to form Cu 2 Ti (L + Cu 4 Ti 3 → Cu 2 Ti) [19]. It was worth noting that the brittleness of Cu-Ti intermetallic compound was lower than Fe-Ti [22], so the formation of Cu 2 Ti helps to reduce the brittleness of welded joint [23]. As shown in Figure 14f, we can see a white region E and a gray region F, which was adjacent to base metal of TA2.…”

“…Cu4Ti3 → Cu2Ti) [19]. It was worth noting that the brittleness of Cu-Ti intermetallic compound was lower than Fe-Ti [22], so the formation of Cu2Ti helps to reduce the brittleness of welded joint [23].…”

Effect of Prior Deformation Above Md Temperature on Tensile Properties of Type 304 Metastable Austenitic Stainless Steel

“…AISI type 304 stainless steel is an attractive choice for a wide range of applications in the automobile, chemical, pharmaceutical, biomedical, nuclear, and space industries owing to the excellent corrosion resistance and strain hardenability of the material. [1][2][3][4] The strain-induced martensitic transformation that occurs in the stainless steel during room temperature deformation bestows the material with excellent strain hardening ability and concomitant ductility. This phenomenon, also known as transformation-induced plasticity (TRIP), has been of interest to researchers who continue to provide new insights into its complex nature.…”