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Effect of quenching and tempering process on sulfide stress cracking susceptibility in API-5CT-C110 casing steel

TitleEffect of quenching and tempering process on sulfide stress cracking susceptibility in API-5CT-C110 casing steel
Publication TypeJournal Article
Year of Publication2017
AuthorsLiu, M, Wang, CH, Dai, YC, Li, X, Cao, GH, Russell, AM, Liu, YH, Dong, XM, Zhang, ZH
JournalMaterials Science and Engineering a-Structural Materials Properties Microstructure and Processing
Volume688
Pagination378-387
Date Published03
Type of ArticleArticle
ISBN Number0921-5093
Accession NumberWOS:000398013900045
Keywords&, api 5l x60, corrosion cracking, crystallographic, EBSD, Grain boundaries, grain-boundary-character, Hydrogen embrittlement, hydrogen-induced cracking, low-alloy steels, Materials Science, Metallurgical Engineering, microalloyed steels, Microstructure, nickel, steel, Technology - Other Topics, texture, x70 pipeline steels
Abstract

Three quenching and tempering processes performed on API-5CT-C110 casing steel produced tempered martensite structures and similar mechanical properties but distinct sulfide stress cracking (SSC) behavior as evaluated by Double Cantilever Beam (DCB) testing. An as-quenched specimen tempered at 690 degrees C for two hours showed superior SSC behavior compared to another specimen tempered at 715 degrees C for one hour. The latter contained a larger fraction of low-angle boundaries (LABs) and higher values of kernel average misorientation (KAM) than those in the former. Moreover, one more quenching and tempering on the former specimen would produce better SSC resistance with a decrease in the fraction of LABs and the values of KAM. Since dislocations trap hydrogen more strongly than grain boundaries, the specimen with higher KAM values, as well as higher dislocation density, would trap more hydrogen atoms and lead to greater SSC.

DOI10.1016/j.mesa.2017.01.067
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Alternate JournalMater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process.