Designing steel to resist hydrogen embrittlement Part 2 – precipitate characterisation

Ooi, S. W.; Ramjaun, T. I.; Hulme-Smith, Christopher; Morana, Roberto; Drakopoulos, Michael; Bhadeshia, H. K. D. H.

doi:10.1080/02670836.2018.1496536

Cited by 12 publications

(3 citation statements)

References 39 publications

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“…Such a bainitic microstructure contains abundant point and line lattice defects 37 . During annealing, the carbide precipitates gradually coarsen, and the dislocation density decreases at the same time 38 .…”

Section: Resultsmentioning

confidence: 99%

Influence of cementite coarsening on the corrosion resistance of high strength low alloy steel

Liu

Che

et al. 2023

npj Mater Degrad

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The impact of heat treatment on the initiation and progression of localized corrosion in E690 steel in a simulated marine environment was investigated systematically. The primary cause of localized corrosion was the presence of inclusions, which led to the dissolution of the distorted matrix surrounding them. In the initial stages of corrosion, localized corrosion resulting from inclusions was the predominant form. The chemical and electrochemical mechanisms underlying matrix deformation and localized corrosion caused by inclusions were meticulously elucidated. As the immersion time was extended, the galvanic contributions at the ferrite-austenite interfaces, as well as the coarsened carbides, reduced the polarization resistance in the annealed specimen, accelerating the corrosion rate compared to the lath martensite in the as-received specimen. Consequently, the heat-treated sample promoted a transition from localized to uniform corrosion. Finally, a model was established to describe the corrosion behavior of E690 steel in the marine environment.

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Section: Resultsmentioning

confidence: 99%

Influence of cementite coarsening on the corrosion resistance of high strength low alloy steel

Liu

Che

et al. 2023

npj Mater Degrad

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“…Among the various methodologies that have been suggested to alleviate HE in HMnS are Al-addition [14][15][16], grain refinement [17,18], or the introduction of hydrogen traps, e.g., k-carbides [19]. However, the role of precipitates in improving hydrogen embrittlement is still a matter of discussion [20][21][22]. Recently, medium manganese steels (MMnSs) with a duplex microstructure have received significant attention due to their excellent mechanical properties and reduced production costs compared to HMnS [23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Development of a Cr-Ni-V-N Medium Manganese Steel with Balanced Mechanical and Corrosion Properties

Allam

Guo

Sevsek

et al. 2019

Metals

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A novel medium manganese (MMn) steel with additions of Cr (18%), Ni (5%), V (1%), and N (0.3%) was developed in order to provide an enhanced corrosion resistance along with a superior strength–ductility balance. The laboratory melted ingots were hot rolled, cold rolled, and finally annealed at 1000 °C for 3 min. The recrystallized single-phase austenitic microstructure consisted of ultrafine grains (~1.3 µm) with a substantial amount of Cr- and V-based precipitates in a bimodal particle size distribution (100–400 nm and <20 nm). The properties of the newly developed austenitic MMn steel X20CrNiMnVN18-5-10 were compared with the standard austenitic stainless steel X5CrNi18-8 and with the austenitic twinning-induced plasticity (TWIP) steel X60MnAl17-1. With a total elongation of 45%, the MMn steel showed an increase in yield strength by 300 MPa and in tensile strength by 150 MPa in comparison to both benchmark steels. No deformation twins were observed even after fracture for the MMn steel, which emphasizes the role of the grain size and precipitation-induced change in the austenite stability in controlling the deformation mechanism. The potentio-dynamic polarization measurements in 5% NaCl revealed a very low current density value of 7.2 × 10−4 mA/cm2 compared to that of TWIP steel X60MnAl17-1 of 8.2 × 10−3 mA/cm2, but it was relatively higher than that of stainless steel X5CrNi18-8 of 2.0 × 10−4 mA/cm2. This work demonstrates that the enhanced mechanical properties of the developed MMn steel are tailored by maintaining an ultrafine grain microstructure with a significant amount of nanoprecipitates, while the high corrosion resistance in 5% NaCl solution is attributed to the high Cr and N contents as well as to the ultrafine grain size.

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“…Both titanium carbide and vanadium carbide crystallize in the rock salt crystal structure. The characteristics of their precipitation in steels, including the size, morphology and composition, depend upon the heat treatment parameters yet vanadium carbide precipitates in steel are known to be off stoichiometric [47,48].…”

mentioning

confidence: 99%

Combined Ab Initio and Experimental Study of Hydrogen Sorption in Dual-Phase Steels

Sagar

Popovich

Kömmelt

et al. 2021

The Minerals, Metals &Amp; Materials Series

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for giving me the opportunity to work on this thesis and the guidance and support that I received throughout my work. I would also like to thank Pascal Kömmelt for sharing his expertise and enthusiasm on the subject. I extend my gratitude towards Dr. Yaiza Gonzalez Garcia for the insightful discussions on electrochemical aspects of this work. I am also grateful to Agnieszka Koojiman for her invaluable guidance and support in conducting the electrochemical experiments. I would also like to thank Ruud Hendrikx for his support on the XRD experiments, and Sander van Asperen and Kees Kwakernaak for their guidance on microscopy techniques. Last but not the least, I am grateful to my parents for their love, support and patience.

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Designing steel to resist hydrogen embrittlement Part 2 – precipitate characterisation

Cited by 12 publications

References 39 publications

Influence of cementite coarsening on the corrosion resistance of high strength low alloy steel

Influence of cementite coarsening on the corrosion resistance of high strength low alloy steel

Development of a Cr-Ni-V-N Medium Manganese Steel with Balanced Mechanical and Corrosion Properties

Combined Ab Initio and Experimental Study of Hydrogen Sorption in Dual-Phase Steels

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