Abstract
Microstructure and corrosion behavior of dissimilar welds between austenitic stainless steel AISI 304 and ferritic stainless steel AISI 430 were investigated. The phase evolution within each weld was analyzed using thermodynamics calculation and electron back-scattered diffraction (EBSD). Results indicated that the welded joints were mainly composed of martensite and ferrite phases. Thermodynamic calculations show that, during the high temperature phase transformation process, the high-temperature ferrite transforms into austenite to form a mixed state. This austenite further transforms into martensite during the following high rate cooling process. It was also found that increasing the melted-in AISI 304 portion in dissimilar welds led to an increase in the austenite portion at high temperature. This resulted in more portions of martensite being present in the weld at the room temperature. Potentiodynamic polarization curves showed that the corrosion resistance of welded joint decreased with increasing fusion ration of AISI 304, and then increased with further increase in fusion ratio. The initial decrease of corrosion resistance could be attributed to the increased martensite contents and fractions of phase boundaries, and the subsequent increase might contribute to increased Cr contents and decreased fractions of phase boundaries.
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