首页|(111712)Grain structure and texture evolution across the defected laser welded Fe-Cu dissimilar joint
(111712)Grain structure and texture evolution across the defected laser welded Fe-Cu dissimilar joint
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NSTL
Elsevier
In this paper, a defected laser welded joint of 304 stainless steel and T2 copper was studied concerning structural arrangement, grain structure and texture evolution. According to SEM and EBSD results, the as-welded fusion zone contained a major fraction of Fe-Cr-Ni rich α structure and minor fraction of Cu-rich ε structure. Furthermore, three types of ε were observed including blocky, curved and spherical forms. Both grain size and crystalline orientation varied largely from 304 side to T2 side. Additionally, epitaxial zone was progressively wider on 304 side than T2. In mixed zone, ε possessed comparably dispersed orientation and fne grains. Based on solidifcation sequence of δ -> Fe-Cr-Ni rich δ/γ -> Cu rich γ in the fusion zone, the dispersed primarily solidifed of Fe-Cr-Ni rich spheres with random orientation led to the formation of fne grains in ε. As for α, the continuous growth of Fe-Cr-Ni rich bulks with uniform orientation promoted the identical growth and orientation of inside Cu rich spheres.
NSTL
Elsevier
