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51316-7551-A Study on Intragranular Chromium Nitrides Precipitation in Cast Superduplex Alloys

Picture for A Study on Intragranular Chromium Nitrides Precipitation in Cast Superduplex Alloys
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Product Number: 51316-7551-SG
ISBN: 7551 2016 CP
Author: Shankar Venkataraman
Publication Date: 2016
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Intragranular chromium nitrides precipitation in superduplex grades has received much attention due to their negative influence on the material properties. These nitrides are formed due to insufficient time available for the nitrogen supersatured in ferrite to diffuse into austenite during cooling after heat treatment. Based on microstructural investigations the susceptibility of various cast superduplex alloys to nitride precipitation has been studied as a function of the chemical composition heat treatment temperature heat treatment as well as nitrogen content. The influence of such a microstructural state on the pitting corrosion resistance as well as Charpy v-notch tests is also studied. For the conventional cast grades an increase in nitrogen content of the alloy increasing heat treatment temperature as well as larger austenite spacing promotes nitride precipitation. The addition of sufficient amount of copper as an alloying element to the cast superduplex grade leads to a refinement in the microstructure leading to shorter diffusion paths for nitrogen and leads to attainment of intragranular nitride free microstructural state.
Intragranular chromium nitrides precipitation in superduplex grades has received much attention due to their negative influence on the material properties. These nitrides are formed due to insufficient time available for the nitrogen supersatured in ferrite to diffuse into austenite during cooling after heat treatment. Based on microstructural investigations the susceptibility of various cast superduplex alloys to nitride precipitation has been studied as a function of the chemical composition heat treatment temperature heat treatment as well as nitrogen content. The influence of such a microstructural state on the pitting corrosion resistance as well as Charpy v-notch tests is also studied. For the conventional cast grades an increase in nitrogen content of the alloy increasing heat treatment temperature as well as larger austenite spacing promotes nitride precipitation. The addition of sufficient amount of copper as an alloying element to the cast superduplex grade leads to a refinement in the microstructure leading to shorter diffusion paths for nitrogen and leads to attainment of intragranular nitride free microstructural state.
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