Open AccessResearch of the occurrence and development of metal defects in sulfide stress cracking inducing environment
Author(s) -
N. I. Gabelchenko,
Н. А. Кидалов,
A. A. Belov,
Н В Григорьева,
Yu. V. Grebnev,
N P Zhiltsov
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1129/1/012004
Subject(s) - materials science , sulfide , metallurgy , pearlite , metal , cracking , stress (linguistics) , ultimate tensile strength , hydrogen embrittlement , hydrogen sulfide , stress corrosion cracking , composite material , sulfur , corrosion , austenite , microstructure , linguistics , philosophy
Comparative studies of the metal of equipment after long-term operation in high hydrogen sulfide environment are carried out. To compare their resistance to sulfide stress cracking, the samples were hydrogenated under a stress of 0.6-0.9 of yield stress in a hydrogen sulfide environment. Characteristic of surface defects (blisters and bubbles) were identified, their size and time of occurrence were determined. To study the further development of the process, the samples were subjected to intense hydrogenation for 6 hours at maximum tensile stresses of 0.95 of the yield stress. Then they were cut across for conducting a metallographic study in order to identify the initiation and development of cracks in the metal. It is shown that steel containing cerium, which promoted the formation of relatively small globular sulfides, has the highest resistance to sulfide stress cracking. Such inclusions, in contrast to sulfide stringers of the FeS and MnS type, were not sources of crack initiation. Another source of crack initiation was the boundaries of pearlite and ferrite grains contaminated with microimpurities.