Interaction Mechanism of Dislocation and Hydrogen in Austenitic 316 Stainless Steel
Received date: 2020-08-28
Revised date: 2020-12-31
Online published: 2021-01-21
Supported by
National Key Research and Development Program of China(2019YFA0210002);Natural Science Foundation of China(11775235、U1732265)
The formation of hydrogen-induced defects in 316 stainless steel and the interaction between hydrogen and defects are crucial aspects to understand the failure law of the hydrogen-induced mechanical properties. Introducing various types of hydrogen sinks, such as interfaces and dislocations, is a popular method for reducing the concentration of residual hydrogen and curbing the mobility of hydrogen atoms in materials. In this work, positron annihilation spectroscopy and thermal desorption spectroscopy (TDS) were used to measure the distribution of hydrogen-induced defects and hydrogen content in deformed 316 stainless steel with hydrogen charging. In particular, the influence of dislocations on the formation of hydrogen-induced defects and the hydrogen retention behavior in the specimens were experimentally investigated. The results show that the S-parameter increases upon hydrogen charging, and the W-parameter is negatively correlated with the S-parameter. The S-parameter value of the deformed sample was found to be larger than that of the annealed sample, indicating that the introduction of hydrogen results in the formation of vacancy defects in the sample. Additionally, hydrogen atoms may gather together to form a large number of volume defects near dislocations. The S-W curves show that the (S, W) point for the sample containing dislocations aggregates towards the surface after hydrogen charging, due to the hindered dislocation motion. In the deformed samples with low hydrogen charge current density, the vacancy formation rate was found to be slow, and the combination of excess hydrogen and vacancies was observed to give rise to hydrogen-vacancy clusters (HmVn), where n > m. The TDS results show that both the activation energy for hydrogen desorption and the amount of hydrogen retention increase due to the presence of dislocations.
Xudong AN , Te ZHU , Qianqian WANG , Yamin SONG , Jinyang LIU , Peng ZHANG , Zhaokuan ZHANG , Mingpan WAN , Xingzhong CAO . Interaction Mechanism of Dislocation and Hydrogen in Austenitic 316 Stainless Steel[J]. Acta Metall Sin, 2021 , 57(7) : 913 -920 . DOI: 10.11900/0412.1961.2020.00332
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