科研之友
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摘要
Type 347 stainless steel was solution annealed at three different temperatures (1100, 1250 and 1300 degrees C) followed by ageing at 650 and 750 degrees C. This was done to study the phase transformations that may occur in stainless steel 347 during welding and/or subsequent ageing. The microstructural examination showed chromium carbide and sigma phase formation at the grain boundaries after ageing. The electrochemical behaviour was evaluated by double-loop electrochemical potentiokinetic reactivation test and anodic polarisation in HCl solution. Chromium carbide precipitation caused large increase in the degree of sensitisation, while sigma phase had the major effect in decreasing the pitting resistance.
- 出版日期2013-2
