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51313-02440-UNS 06625: Precipitation and Sensitization

Product Number: 51313-02440-SG
ISBN: 02440 2013 CP
Author: Roland Lackner
Publication Date: 2013
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The impact of production parameters (end rolling temperature and cooling rate) on microstructure and corrosion properties of Alloy 625 used as a cladding material in oil and gas industry was investigated. In addition the effect of different annealing treatments was determined. Susceptibility to intergranular corrosion was investigated by means of a conventional immersion test (Streicher-test ASTM G28A) and the DL-EPR method. SEM was used to evaluate microstructure and the type of corrosive attack prior and after testing. Furthermore characterization of pitting corrosion properties was done by electrochemical measurements (Current density - potential curves). Precipitation of various phases adjacent grain boundaries was found. Chemical composition of phases was characterized by SEM and TE as well as with SAES and ToF-SIMS. The results of high-resolution investigations were compared to those of corrosion measurements and are critically discussed. In conclusion the most promising production parameters of thermomechanically rolled Alloy 625 are described.

The impact of production parameters (end rolling temperature and cooling rate) on microstructure and corrosion properties of Alloy 625 used as a cladding material in oil and gas industry was investigated. In addition the effect of different annealing treatments was determined. Susceptibility to intergranular corrosion was investigated by means of a conventional immersion test (Streicher-test ASTM G28A) and the DL-EPR method. SEM was used to evaluate microstructure and the type of corrosive attack prior and after testing. Furthermore characterization of pitting corrosion properties was done by electrochemical measurements (Current density - potential curves). Precipitation of various phases adjacent grain boundaries was found. Chemical composition of phases was characterized by SEM and TE as well as with SAES and ToF-SIMS. The results of high-resolution investigations were compared to those of corrosion measurements and are critically discussed. In conclusion the most promising production parameters of thermomechanically rolled Alloy 625 are described.

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