TY - JOUR

T1 - Investigations on the hydrogen embrittlement tendency of K55 for underground storage applications using hollow probe specimens

AU - Eichinger, Matthias

AU - Zwittnig, Dino

AU - Mori, Gregor Karl

PY - 2024/3/19

Y1 - 2024/3/19

N2 - The susceptibility of ferritic pearlitic steel K55 to hydrogen embrittlement in high pressure gas atmospheres was investigated using slow strain rate tests with hollow probe specimens. Therefore, the specimens were charged with an internal hydrogen pressure of up to 20 MPa according to planned conditions for underground gas storages. The results show a significant decrease in ductility caused by hydrogen embrittlement yielding a loss in fracture strain of 46 % at 10 MPa and 63 % at 20 MPa hydrogen partial pressure compared to a specimen tested in nitrogen atmosphere. Furthermore, observations on the cross-sections of the tested specimens reveal that pearlite acts as obstacle for hydrogen enhanced crack growth.

AB - The susceptibility of ferritic pearlitic steel K55 to hydrogen embrittlement in high pressure gas atmospheres was investigated using slow strain rate tests with hollow probe specimens. Therefore, the specimens were charged with an internal hydrogen pressure of up to 20 MPa according to planned conditions for underground gas storages. The results show a significant decrease in ductility caused by hydrogen embrittlement yielding a loss in fracture strain of 46 % at 10 MPa and 63 % at 20 MPa hydrogen partial pressure compared to a specimen tested in nitrogen atmosphere. Furthermore, observations on the cross-sections of the tested specimens reveal that pearlite acts as obstacle for hydrogen enhanced crack growth.

U2 - 10.1016/j.matlet.2024.136330

DO - 10.1016/j.matlet.2024.136330

M3 - Letter

VL - 364.2024

JO - Materials letters

JF - Materials letters

SN - 0167-577X

IS - 1 June

M1 - 136330

ER -