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Influence of heat treatments between 500 and 1125°C on forged alloy 625 has been studied. Hardening between 650 and 800°C results of dislocation glidings of matrix, zf" precipitation and maximum of intergranular precipitation of fine M23C6 carbides. Tensile strength and intergranular corrosion through ASTM G 28 test become maxima, impact strength and reduction of area become minima, in the field of M23C6 and M6C intergranular precipitation : between 700 and 950°C.

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The influence of heat treatments between 500 and 1125°C on corrosion resistance of forged alloy 625 has been studied. An electrochemical potentiokinetic reactivation method has been perfected and compared to the ASTM G28 test results. Large intergranular corrosion occurs on samples heat treated between 700 and 950°C due to the intergranular precipitation of Cr-and MO-rich carbides. Two of the samples which had the most different behaviour, solution-treated and solutiontreated + 8h at 750°C were then studied in 4M HCl. Dissolution is a little stronger in the passive range for the material treated at 750°C.