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Спутники
РН
SpaceX
Роскосмос
NASA
СпутникиРНSpaceXРоскосмосNASAPublication date: 13 April 2026
Source: Applied Mechanics and Materials Vol. 935
Author(s): Guang Xu Cheng, Wei Chen Song, Song Yan Hu, Sheng Wen Tu, Hai Jun Hu
This study employs hydrogen permeation tests, slow-strain-rate tensile tests, and Charpy impact tests to investigate how the welding process and PWHT influence hydrogen diffusion behavior and hydrogen embrittlement susceptibility of welded joint. The research results indicate: The microstructure of all regions of the welded joint consist of granular bainite, MA islands, and precipitated carbides, carbides are mainly M23C6, M7C3, M2C, and M6C types. These carbides act as irreversible hydrogen traps and are the primary reason for the reduced hydrogen diffusion coefficient in the material. The heterogeneous microstructure of the weld metal causes direction-dependent hydrogen diffusivity. PWHT also influence hydrogen embrittlement susceptibility. The findings of this study can provide theoretical guidance for optimizing welding procedures in the fabrication of hydrogenation reactors.
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