The mechanism of hydrogen embrittlement in intercritically annealed medium Mn TRIP steel

Han, Jeongho; Nam, Jae Hoon; Lee, Young Kook

doi:10.1016/j.actamat.2016.04.038

Cited by 154 publications

(89 citation statements)

References 36 publications

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“…There are numerous studies validating the HELP mechanism in various steels using various testing and characterisation techniques [52,67,69,107,111,176,191,196,237]. As such, the key papers from which the HELP theory has been developed and that provide the most conclusive evidence will be summarised.…”

Section: Evidence Supporting the Help Mechanismmentioning

confidence: 99%

Understanding and mitigating hydrogen embrittlement of steels: a review of experimental, modelling and design progress from atomistic to continuum

et al. 2018

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Hydrogen embrittlement is a complex phenomenon, involving several lengthand timescales, that affects a large class of metals. It can significantly reduce the ductility and load-bearing capacity and cause cracking and catastrophic brittle failures at stresses below the yield stress of susceptible materials. Despite a large research effort in attempting to understand the mechanisms of failure and in developing potential mitigating solutions, hydrogen embrittlement mechanisms are still not completely understood. There are controversial opinions in the literature regarding the underlying mechanisms and related experimental evidence supporting each of these theories. The aim of this paper is to provide a detailed review up to the current state of the art on the effect of hydrogen on the degradation of metals, with a particular focus on steels. Here, we describe the effect of hydrogen in steels from the atomistic to the continuum scale by reporting theoretical evidence supported by quantum calculation and modern experimental characterisation methods, macroscopic effects that influence the mechanical properties of steels and established damaging mechanisms for the embrittlement of steels. Furthermore, we give an insight into current approaches and new mitigation strategies used to design new steels resistant to hydrogen embrittlement.

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Section: Evidence Supporting the Help Mechanismmentioning

confidence: 99%

Understanding and mitigating hydrogen embrittlement of steels: a review of experimental, modelling and design progress from atomistic to continuum

et al. 2018

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“…These features basically indicate the occurrence of mixed fracture surface of intergranular and quasi-cleavage in the region I. The intergranular fracture is explained by the hydrogen-enhanced decohesion mechanism that dissolved hydrogen weakens the bonding of Fe lattice atoms [32]. Du proposed that a critical strain demanded for intergranular fracture is decreased due to hydrogen reduces the bonding of Fe atoms at grain boundaries [33].…”

Section: Analysis Of Sem Micrographs and Composition Of Nonmetallic Imentioning

confidence: 99%

Effect of hydrogen embrittlement and non-metallic inclusions on tensile fracture properties of 55CrSi spring steel

Wang

Liang

2020

Mater. Res. Express

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The tensile fracture behavior of 55CrSi spring steels were investigated. The results demonstrate that interior inclusion and hydrogen level has a significant effect on ductility and a minimal effect on tensile strength of the spring steel. It was due to the effect of cracking from MgO-Al 2 O 3 spinel inclusion or the inclusions with a mixture of CaO, SiO 2 and part of Al 2 O 3 due to hydrogen. The results of SEM showed that the ductility reduction is connected with the formation of 'fisheye' which formed under the influence of mobile hydrogen. For the specimen containing MgO-Al 2 O 3 spinel inclusion, the fracture surface in the 'fisheye' area is mainly composed of three regions including typical quasi-cleavage mixed intergranular fracture, dimple mixed transgranular fractures and ductile fracture from the interior to the edge, whereas there is no obvious transition zone from brittle fracture to dimple fracture in the 'fisheye' area of the specimen containing inclusions with a mixture of CaO, SiO 2 and part of Al 2 O 3 .

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“…Hydrogen embrittlement (HE) resistance is an important criterion for modern high-strength steels applied in the automobile industry, energy industry, aerospace industry and chemistry industry. The ferrite/martensite phase is considered to be vulnerable to hydrogen ingression, which contributes to the severe level of HE [16][17][18][19][20]. The austenite, as a critical phase in MMnS to improve mechanical performance, was reported to trap the hydrogen atoms effectively and leave the absorbed hydrogen in a more activated state, resulting in brittle fracture by the localized TRIP effect [16,17,19].…”

Section: Introductionmentioning

confidence: 99%

“…The austenite, as a critical phase in MMnS to improve mechanical performance, was reported to trap the hydrogen atoms effectively and leave the absorbed hydrogen in a more activated state, resulting in brittle fracture by the localized TRIP effect [16,17,19]. Han et al [18] investigated the HE behavior in cold-rolled and hot-rolled Fe-7Mn-0.1C steel, correlating the contributions of well-established HE mechanisms, such as hydrogen-enhanced decohesion (HEDE) [21][22][23][24] and hydrogen-enhanced localized plasticity (HELP) [21,22,25,26] with microstructural features. The lamellar microstructure was found to be sensitive to hydrogen ingression compared to the granular one [18].…”

Section: Introductionmentioning

confidence: 99%

Influence of Microstructural Morphology on Hydrogen Embrittlement in a Medium-Mn Steel Fe-12Mn-3Al-0.05C

Shen

Song

Sevsek

et al. 2019

Metals

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The ultrafine-grained (UFG) duplex microstructure of medium-Mn steel consists of a considerable amount of austenite and ferrite/martensite, achieving an extraordinary balance of mechanical properties and alloying cost. In the present work, two heat treatment routes were performed on a cold-rolled medium-Mn steel Fe-12Mn-3Al-0.05C (wt.%) to achieve comparable mechanical properties with different microstructural morphologies. One heat treatment was merely austenite-reverted-transformation (ART) annealing and the other one was a successive combination of austenitization (AUS) and ART annealing. The distinct responses to hydrogen ingression were characterized and discussed. The UFG martensite colonies produced by the AUS + ART process were found to be detrimental to ductility regardless of the amount of hydrogen, which is likely attributed to the reduced lattice bonding strength according to the H-enhanced decohesion (HEDE) mechanism. With an increase in the hydrogen amount, the mixed microstructure (granular + lamellar) in the ART specimen revealed a clear embrittlement transition with the possible contribution of HEDE and H-enhanced localized plasticity (HELP) mechanisms.

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The mechanism of hydrogen embrittlement in intercritically annealed medium Mn TRIP steel

Cited by 154 publications

References 36 publications

Understanding and mitigating hydrogen embrittlement of steels: a review of experimental, modelling and design progress from atomistic to continuum

Understanding and mitigating hydrogen embrittlement of steels: a review of experimental, modelling and design progress from atomistic to continuum

Effect of hydrogen embrittlement and non-metallic inclusions on tensile fracture properties of 55CrSi spring steel

Influence of Microstructural Morphology on Hydrogen Embrittlement in a Medium-Mn Steel Fe-12Mn-3Al-0.05C

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