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Electrochemical Corrosion Behavior of the Laser Continuous Heat Treatment Welded Joints of 2205 Duplex Stainless Steel

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Journal of Wuhan University of Technology(Materials Science) 2011年第6期26卷 1140-1147页

作者：刘和平金学军 School of Materials Science and Engineering Shanghai Jiao Tong University

The electrochemical corrosion behaviors of the welded joints of 2205 duplex stainless steel with the laser continuous heat treatment were investigated. The secondary austenite formation is the outcome of thermodynamic equilibrium breach of the alloy during heat treatment and the result of the continuous heat treatment which has the most important effect on the weld material. The partitioning behaviors of chromium and molybdenum as well as the volume fraction of ferrite and austenite have a remarkable influence on the composition of the individual phase. Mechanical examination of the laser trated weld demonstrates that the tensile strength and yield strength increase with increasing the amount of the secondary austenite. It is shown that the ultimate tensile strength of the 6 kW laser-treated weld is higher about 20 MPa than no heat treatment weld and the ductility can be further improved without compromising strength. The results indicate that the welding alters the corrosion behavior because of different post heat treatment power and the broad active peak is not identified which is attributed to the dissolution of the secondary austenitic in the ferrite phase. It is indicated that pitting resistance equivalent （PRE） values of base metal and 6 kW weld are higher than that of other welds; base metal is 33.7, 6 kW weld 33.3, no treatment 32.4, 4 kW weld 32.8, 8 kW weld 32.5. The extent of corrosion resistance improvement after reheating treatment is mainly caused by the removal of nitrogen from ferritic regions, which occurred as a consequence of secondary austenite growth.

关键词： potentiodynamic polarization duplex stainless steel continuous heat treatment secondary austenite

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Microstructural Characterization of Welded Joint in Duplex Stainless Steel by Laser Continuous Heat Treatment

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Journal of Iron and Steel Research International 2014年第7期21卷 710-714页

作者： He-ping LIU Bin LIU Da-zhao LI Hu-er SUN Feng-er SUN Xue-jun JIN School of Materials Science and Engineering North University of China School of Materials Science and Engineering Shanghai Jiao Tong University

Microstructural characterization in fusion zone of the laser continuous heat treatment welded joint was in vestigated. The results showed that the martensite-like microstructure is the face centered cubic （FCC） crystal structure so that it can be identified as the secondary austenite. The dislocation is observed inside and outside the seconda ry austenite, whereas inclusion is not found in the vicinity of the secondary austenite. In the fusion zone, there is a kind of carbide precipitate which is identified as M23 C6 by the means of transmission electron microscope （TEM）. The carbide precipitate is a representative mode of transformation, which can be generated by the eutectoid reaction. Furthermore, the formation mechanisms of the secondary austenite and chromium carbide are analyzed.

关键词： fusion zone continuous heat treatment characterization secondary austenite carbide

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