Affiliation:
1. School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, UK
2. RA Materials, UK
Abstract
Abstract
Temper free induction bending can have a significant impact on the mechanical and corrosion-resistance properties of thick-walled super duplex pipe. Sections from induction bent pipe were solution annealed at 1 120 °C for various periods to sequentially eliminate different deleterious phases. By comparing the results of modified DL-EPR analysis, optical microscopy, mechanical and corrosion testing before and after the various heat treatments, it was shown that the deterioration in properties was due to the precipitation of α′. It was also possible to determine the order in which α′, γ2 and Cr2N had precipitated, and thus to conclude that the unfavourable metallurgy was the result of inadequate post-bend cooling. A likely thermal history for the pipe is proposed that leads to the description of a modified temper free process.
Subject
Materials Chemistry,Metals and Alloys,Physical and Theoretical Chemistry,Condensed Matter Physics
Cited by
2 articles.
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