Effect of Boron Microalloying Element on Susceptibility to Hydrogen Embrittlement in High Strength Mooring Chain Steel

Li, H.; Cheng, Xiaoying; Shen, H.P.; Su, Lei; Zhang, S.Y.

doi:10.1002/9781119223399.ch151

Cited by 3 publications

(3 citation statements)

References 19 publications

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“…However, the influence of boron on hydrogen sensitivity of steels is still debatable. For example, Li et al [82] observed a positive effects of small amounts of boron on HE susceptibility, due to its ability to reduce the amount of trapped diffusible hydrogen. In contrast, Komazazki et al [83] observed no influence of boron on susceptibility.…”

Section: Martensitic Microstructurementioning

confidence: 99%

The influence of microstructure on the hydrogen embrittlement susceptibility of martensitic advanced high strength steels

Venezuela

Zhou²,

Liu

et al. 2018

Materials Today Communications

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This work addresses the influence of microstructure on the hydrogen embrittlement of advanced high-strength steels. With sufficient hydrogen, fracture initiates at the ultimate tensile stress, but initiation is at the specimen surface. Fracture initiation is typically intergranular, transgranular or quasi-cleavage. These micro-fracture modes suggest that planar defects are important, such as prior austenite grain boundaries and lath and block boundaries. Fracture propagation is by shear fracture indicating a major influence of hydrogen-dislocation interactions. These hydrogen assisted fractures occur at a fast rate, probably approaching the speed of sound, that is at fracture velocities greater than 1000 m/s.

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Section: Martensitic Microstructurementioning

confidence: 99%

The influence of microstructure on the hydrogen embrittlement susceptibility of martensitic advanced high strength steels

Venezuela

Zhou²,

Liu

et al. 2018

Materials Today Communications

View full text Add to dashboard Cite

show abstract

“…Nie et al [52] reported that the resistance to the delayed fracture increased with the increasing B addition. Li et al [53] reported that the effect of the B addition on the susceptibility to the delayed fracture was weak if the hydrogen charging was mild; however, in the case of severe charging, the susceptibility to the delayed fracture decreased with an increasing amount of B. The insignificant effect of B was also reported by Komazaki et al [54].…”

Section: Effect Of Microalloys On the Resistance To Delayed Fracturementioning

confidence: 71%

Microstructural Control and Alloy Design for Improving the Resistance to Delayed Fracture of Ultrahigh-Strength Automotive Steel Sheets

Senuma,

Okayasu,

Mohrbacher

2023

Metals

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The demand for higher-strength automotive steel sheets has increased significantly for lightweight and safe body concepts. However, the increment of the steel strength is often limited by the potential occurrence of delayed fracture. This paper discusses proper microstructure control and alloy design to improve the resistance against the delayed fracture of ultrahigh-strength automotive steel sheets in order to increase the usable upper limit of their strength and provides basic data serving as a practical guide for solving the problem of delayed fracture in ultrahigh-strength automotive steel sheets. It is confirmed that grain refinement, the appropriate dual-phase structure of martensite with ferrite or retained austenite, and surface decarburization, increase the resistance to delayed fracture. In terms of alloy design, the effects of Nb, Mo, and B on the delayed fracture resistance of hot-stamped steels have been investigated. The results suggest that there are other reasons for Nb to improve delayed fracture resistance in addition to grain refinement and the ability to trap hydrogen by its precipitates, as has been conventionally believed. Regarding Mo, it was clearly demonstrated that the segregation of this element at the grain boundary plays a main role in improving the delayed fracture resistance.

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“…For this, small amounts of boron and bismuth were used. The literature [15][16][17] shows that boron as a microadditive usually segregates along grain boundaries. For example, it can reduce the segregation of phosphorus at grain boundaries.…”

Section: The Effect Of High-aluminum Cast Iron Modification-a Minor Addition Of Boron and Heat Treatmentmentioning

confidence: 99%

Shaping the Microstructure of High-Aluminum Cast Iron in Terms of the Phenomenon of Spontaneous Decomposition Generated by the Presence of Aluminum Carbide

et al. 2021

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A suitable aluminum additive in cast iron makes it resistant to heat in a variety of environments and increases the abrasion resistance of the cast iron. It should be noted that high-aluminum cast iron has the potential to become an important eco-material. The basic elements from which it is made—iron, aluminum and a small amount of carbon—are inexpensive components. This material can be made from contaminated aluminum scrap, which is increasingly found in metallurgical scrap. The idea is to produce iron castings with the highest possible proportion of aluminum. Such castings are heat-resistant and have good abrasive properties. The only problem to be solved is to prevent the activation of the phenomenon of spontaneous decomposition. This phenomenon is related to the Al4C3 hygroscopic aluminum carbide present in the structure of cast iron. Previous attempts to determine the causes of spontaneous disintegration by various researchers do not describe them comprehensively. In this article, the mechanism of the spontaneous disintegration of high-aluminum cast iron castings is defined. The main factor is the large relative geometric dimensions of Al4C3 carbide. In addition, methods for counteracting the phenomenon of spontaneous decay are developed, which is the main goal of the research. It is found that a reduction in the size of the Al4C3 carbide or its removal lead to the disappearance of the self-disintegration effect of high-aluminum cast iron. For this purpose, an increased cooling rate of the casting is used, as well as the addition of elements (Ti, B and Bi) to cast iron, supported in some cases by heat treatment. The tests are conducted on the cast iron with the addition of 34–36% mass aluminum. The molten metal is superheated to 1540 °C and then the cast iron samples are cast at 1420 °C. A molding sand with bentonite is used to produce casting molds.

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Effect of Boron Microalloying Element on Susceptibility to Hydrogen Embrittlement in High Strength Mooring Chain Steel

Cited by 3 publications

References 19 publications

The influence of microstructure on the hydrogen embrittlement susceptibility of martensitic advanced high strength steels

The influence of microstructure on the hydrogen embrittlement susceptibility of martensitic advanced high strength steels

Microstructural Control and Alloy Design for Improving the Resistance to Delayed Fracture of Ultrahigh-Strength Automotive Steel Sheets

Shaping the Microstructure of High-Aluminum Cast Iron in Terms of the Phenomenon of Spontaneous Decomposition Generated by the Presence of Aluminum Carbide

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