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Nickel-base alloys 718, 725, and 925 are commonly used in oil and natural gas production. Being heavily alloyed multi-component systems; these materials require special consideration for processing and heat treatments. This paper shows the effect of intergranular precipitates on mechanical properties and slow strain rate (SSR) test results in sour oil patch environments.
Processing conditions were designed to produce alloys 718 (UNS N07718), 725 / 725HS (UNS N07725), and 925 (UNS N09925) with essentially clean grain boundaries, partial coverage of grain boundaries by the precipitates, and full coverage of grain boundaries by the precipitates. Grain boundary precipitates were found to degrade room temperature impact strength. Partial coverage of grain boundaries by second phase particles did not adversely affect the properties in slow strain rate (SSR) tests conducted in the oil patch environments. However, the materials having grain boundaries fully covered with second phase particles had inferior properties in SSR testing. Key Words: UNS N07718, UNS N07725, UNS N09925, slow strain rate, oil patch, microstructure, time-temperature-transformation diagram, grain boundary precipitates, processing
A test project to examine the susceptibility of Hydrogen Induced Stress Cracking (HISC) has been executed. In this project hydrogen charged samples of Alloy 718 and Alloy 725 have been exposed under tensile stress to establish critical stress levels for initiation of HISC.
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