Session: MF-02-04 Materials for Hydrogen Service (Joint with C&S)-4

Paper Number: 153820

153820 - Effect of Heating Rate and Sample Size on Thermal Desorption Spectroscopy of Hydrogen in High Strength Steel 

Abstract: 

The hydrogen content in reversible and irreversible hydrogen traps in steels, as well as the desorption energy of the corresponding trap can be obtained through the thermal desorption spectroscopy (TDS) method. However, the desorption behaviors are affected by the heating rate and the size of the tested samples. Firstly, standard hydrogen-filled samples were tested to ensure the stability and accuracy of the hydrogen thermal desorption spectroscopy equipment. Then, the steel used in pressure vessels and pipelines were cut into different sample sizes and pre-charging of hydrogen in high pressure gaseous hydrogen environment. Finally, thermal desorption spectroscopy tests were carried out for the hydrogen-charging samples with different heating rates, and the hydrogen concentration as well as the TDS curves were analyzed. The results show that the sample size and heating rate have little influence on the hydrogen concentration test results, but have significant influence on the TDS curves. The position of desorption peaks moves to high temperature with larger diameters of the samples. In addition, the full width at half maximum (FWHM) of the peak widens, and the maximum desorption rate decreases. The position of desorption peaks moves to the high temperature with increasing heating rates. With higher heating rate, the desorption peaks of different hydrogen traps overlap, and a secondary desorption peak will appear, making the decoupling process much more difficult. Therefore, the TDS analysis should be conducted with the same sample size and slow heating rates.

Presenting Author: Hao Yang Hefei General Machinery Research Institute Co. LTD

Presenting Author Biography: Yang Hao, Ph.D., born in 1992, an engineer in Hefei General Machinery Research Institute Co., LTD., China, has been engaged in the research of plasticity mechanics and hydrogen embrittlement behaviors of steels.

Authors:

Hao Yang Hefei General Machinery Research Institute Co. LTD
Xuedong Chen Hefei General Machinery Research Institute Co., Ltd
Zhichao Fan Hefei General Machinery Research Institute Co., Ltd
Yu Zhou Hefei General Machinery Research Institute Co., Ltd
Qiang Zhang Hefei General Machinery Research Institute Co., Ltd
Yue Li Hefei General Machinery Research Institute Co., Ltd