Effects of alloying elements and heat treatment on hydrogen diffusion in SCRAM steels
Source abstract
Abstract
Abstract In this paper, the effects of alloying elements Ti and N, different heat treatments and permeation temperature on hydrogen diffusion in SCRAM steels were investigated. Devanathan-Stachurshi electrochemical hydrogen permeation technique was used to determine the hydrogen diffusivity. The results show that increasing the content of Ti and N can decrease the hydrogen diffusion coefficient of SCRAM steels. Compared with the traditional quenching and tempering heat treatment process, the process including an intermediate hold can refine the M23C6 phase, increase the volume fraction of MX phase but coarsen the martensitic lath. The twice quenching and tempering heat treatment process can not only refine the martensitic lath and M23C6 phase, but also increase the volume fraction of MX phase, resulting in a decrease of hydrogen diffusivity. The hydrogen permeation steady-state current density and the hydrogen diffusivity increase with the rise of permeation temperature. The temperature dependence of hydrogen diffusion coefficient conforms with the Arrhenius relationship. And the activation energy for hydrogen diffusion of two SCRAM steels with different heat treatments was determined.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Hydrogen embrittlement and corrosion behaviors in metals · Microstructure and Mechanical Properties of Steels · Corrosion Behavior and Inhibition
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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