Abstract
The influence of before and after high-temperature tempering treatment on hydrogen diffusion behavior in X80 pipeline steel containing different vanadium contents has been studied through hydrogen permeation test. The results show that with the increase of vanadium content in steels, the hydrogen diffusion coefficient decreases because of the increase of precipitates and low angle grain boundaries (LAGBs) and special grain boundaries (special GBs). The high-temperature tempering treatment promotes the formation of precipitates, but reduces the number of LAGBs and special GBs. The binding and trap energies of LAGBs and special GBs with hydrogen atoms are much lower than that of precipitates in steels, and thus the hydrogen diffusion coefficient in high-temperature tempering samples is lower, which decreases the hydrogen diffusion coefficient in high-temperature tempering samples.KeywordsHigh-temperature temperingPrecipitatesGrain boundariesHydrogen diffusionPipeline steel
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