SS304和Q235异种钢搅拌摩擦焊接头腐蚀有限元模拟

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中图分类号：TG407

Finite element simulation of corrosion of SS304 and Q235 dissimilar steel friction stir welded joints

WANG Hongduo，CHANG Suteng，LU Yongxin，LIU Yanming(Xi'an Shiyou University，Xi'an 710065，China）

Abstract:In view of galvanic corrosion of dissimilar metal welded joints，based on principle of corrosion electrochemistry，parameters of potentiodynamic polarization curve and area ratio of metallgraphic structure were used as boundary conditions.Finite element analysis software COMSOL was used to predict corrosion behavior of FSWed joints of Q235 low-carbon steel and 304 stainlessteel (SS304）dissimilar steel in different zones，and variation law of macroscopic and microscopic galvanic corrosion potential distribution and current density in different zones of welded joints was studied.The results showed that in macroscopic galvanic corrosion，the maximum corrosion depth was located at the junction of retreating side of SS304 ( RS304 ）and stiring zone （SZ）, which was about 5 times that of base metal of Q235 low carbon steel ( BMQ235 ). Current density of all zones increased with the increase of corrosion time. In microscopic galvanic corrosion,the maximum corrosion depth was located at the junction of stirring zones on both the SS304 side ( SZ304 ）and the Q235 side ( SZQ235 )， which was about 1.2 times that of BMQ235 . Moreover,the larger the area proportion of pearlite was,the worse the corrosion resistance was.The finite element model could be used to predict corrosion behavior offriction stir welded joints of dissimilar steels in different zones.

Key words: 3O4 stainlesssteel; Q235 mild steel; friction stir welded joints;finite element simulation

0前言

异种钢的焊接常应用于石油化工、造船和造车等领域。（剩余13908字）