Effect of shearing prestrain on the hydrogen embrittlement of 1180 MPa grade martensitic advanced high-strength steel. (1st May 2022)

• Record Type: Journal Article
• Authors: Li, Huixing; Venezuela, Jeffrey; Zhou, Qingjun; Shi, Zhiming; Yan, Ming; Knibbe, Ruth; Zhang, Mingxing; Dong, Futao; Atrens, Andrej
• Is Part Of: Corrosion science. Volume 199(2022)
• Publication Date: 2022-05-01
• Subjects: A. Martensitic advanced high-strength steelC. Hydrogen embrittlement -- C. Prestrain -- C. Shearing -- C. Fracture initiation and propagation; AHSS Advanced High-strength Steel -- HE Hydrogen embrittlement -- MS Martensitic -- UTS ultimate tensile strength -- DP dual phase -- Q&P quenching and partitioning -- TWIP twining induced plasticity -- MS1180 martensitic AHSS with minimum tensile strength of 1180 MPa used in this research -- RD rolling direction -- TD transverse direction -- ND normal direction -- ASTM Americal society of testing and materials -- H Hydrogen -- SE secondary electron -- EBSD electron back-scattered diffraction -- SEM scanning electron microscope -- PAG prior austenite grain -- IPF inverse pole fig -- KAM kernel average misorientation -- GND geometrically necessary dislocations -- TEM transmission electron microscope; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2022.110170
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: This work investigated the effect of shearing prestrain on hydrogen embrittlement. The strength and ductility values were similar to those in air for hydrogen precharging before tensile testing, but the ductility decreased significantly for tensile testing with in-situ hydrogen charging due to intergranular fracture initiation at the specimen surface. In contrast, there was a significant decrease in ductility for the hydrogen precharged steel after prestrain. The hydrogen-facilitated fracture was transgranular. The hydrogen fracture grew by fracture tip blunting, new fracture initiation, and coalescence, consistent with a hydrogen enhanced localized plasticity (HELP) mechanism. Highlights: Internal hydrogen had minimal influence on the mechanical properties of MS 1180 with no prestrain. Internal hydrogen plus prestrain decreased tensile strength by 4% and elongation by 42%. The hydrogen fracture mode was intergrannular in unstrained MS 1180. Hydrogen fracture was transgrannular in prestrained MS1180, due to trapped hydrogen and the increased dislocation density. The hydrogen-facilitated fracture mechanism was hydrogen enhanced localized plasticity.