Abstract
Sequence of solidification front was investigated for various stainless steel weld metals by means of quenching in liquid-tin. Using the solidification sequence, a new two dimensional solidification model of cellular dendritic growth was proposed in order to study the weld solidification phenomena of stainless steel. Then, calculations of fraction solid against temperature decrease during solidification and segregation of the solutes within the cellular dendrites were done by means of finite difference method. The results calculated were compared with the experimental results which were obtained by quenching for each stainless steel. As a result, it was concluded that the modeling in this study is valid enough in order to understand the weld solidification. Moreover, the modeling was applied to the estimation of the Solidification Brittleness Temperature Range (BTR) in fully austenitic and ferritic stainless steel welds. The magnitude of the BTR and the detrimental roles of each element in the BTR were calculated. Furthermore, the detrimental effect of nitrogen in the BTR of duplex stainless steel were estimated by calculation. The predictions calculated were experimentally confirmed by the Trans-Varestraint cracking test.
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