Role of microstructure, composition and hardness in resisting hydrogen embrittlement of fastener grade steels

Nanninga, Nicholas E.; Grochowsi, J.; Heldt, L. A.; Rundman, Karl B.

doi:10.1016/j.corsci.2009.12.020

Cited by 87 publications

(20 citation statements)

References 19 publications

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“…The impact of hydrogen on the mechanical properties of AHSS/UHSS grades with different microstructures was investigated . These results demonstrate, that pearlitic microstructures are less susceptible to HE than bainitic or tempered martensitic microstructures . Complex‐phase microstructures tend to be more resistant to HE than dual‐phase and tempered martensitic steels .…”

Section: Introductionmentioning

confidence: 99%

“… Advanced and ultra‐high strength steels (AHSS/UHSS) are susceptible to hydrogen embrittlement (HE), for which diffusion of hydrogen is essential . To obtain information on hydrogen diffusion in AHSS grades, the present work is focusing on the impact of AHSS grade microstructures and microalloying elements (Nb, Ti, Zr, V, B, and Mo) on the hydrogen diffusion coefficient and the density and energy of reversible traps.…”

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confidence: 99%

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The Impact of Nb, Ti, Zr, B, V, and Mo on the Hydrogen Diffusion in Four Different AHSS/UHSS Microstructures

Rehrl

Mraczek

Pichler

et al. 2013

steel research int.

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Advanced and ultra-high strength steels (AHSS/UHSS) are susceptible to hydrogen embrittlement (HE), [1][2][3][4] for which diffusion of hydrogen is essential. [5,6] To obtain information on hydrogen diffusion in AHSS grades, the present work is focusing on the impact of AHSS grade microstructures and microalloying elements (Nb, Ti, Zr, V, B, and Mo) on the hydrogen diffusion coefficient and the density and energy of reversible traps. For this purpose hydrogen diffusion in non-and microalloyed dual-phase-, complex-phase, and tempered martensitic microstructures with tensile strength levels between 1200 and 1400 MPa was analyzed. The diffusion coefficient and trapping parameters were determined via electrochemical permeation measurements according to the works of Grabke et al. [7] and Gehrmann. [8] Generally, a dependence of the hydrogen diffusion coefficient on the microstructure was found with tempered martensitic microstructures showing the highest diffusion coefficents followed by dual-phase microstructures. Complex-phase microstructures reveal the lowest values for the diffusion coefficient. A significant dependence of the diffusion coefficient and trapping parameters on microalloying is not evident, except for substitutionally dissolved Mo and V-precipitates which tend to influence the density of reversible traps significantly.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

The Impact of Nb, Ti, Zr, B, V, and Mo on the Hydrogen Diffusion in Four Different AHSS/UHSS Microstructures

Rehrl

Mraczek

Pichler

et al. 2013

steel research int.

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“…Hardness profiles measured from 0.25/0.50 at 0.25/0.50 are also shown for both cases. The average values of microhardness found in both the melt metal (FM) and the thermally affected zone (HAZ) are high due to the presence of upper bainite island in the fusion metal and martensite (NANNINGA, et al 2010;LEE, et al 2011). Figure 7 shows that in the Circumferential Welding (CW), the microhardness distribution was different, because in the ZTA the values isolated were high due to the interpass heating, which affects the local near the base metal, which generates a quenching effect, resulting in larger grain sizes and hardness higher than the average of 215 HV [15][16].…”

Section: -Microhardnessmentioning

confidence: 99%

A Contextualização Sociocultural Na Educação Matemática No Ensino Fundamental Nas Séries Finais

Bastianelli¹,

Nunes²

2018

SODEBRAS

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Resumo-A presente pesquisa analisou o uso de softwares por discentes de ensino técnico do Instituto Federal de Minas Gerais-Campus Ponte Novaem apoio ao conteúdo ministrado pelos docentes. Pacote Office e SLogo foram os softwares analisados em função de suas utilizações nas disciplinas de Introdução à Informática e Lógica Matemática. A pesquisa aborda grandes áreas do conhecimento como: educação, estatística e informática. Trata-se de um estudo de caso, com características de pesquisa quantitativa. Como resultado da pesquisa, foi verificado que os discentes aceitaram a utilização das ferramentas computacionais e a pergunta da pesquisa foi respondida: Qual a contribuição dos softwares no processo de aprendizagem dos discentes em uma Instituição de Ensino Público Federal? Palavras-chave: Softwares no Ensino. Ferramentas Tecnológicas na Escola. Ensino nos Cursos Técnicos.

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“…[5][6][7] In particular, it is known that the microstructure and hardness of the heat affected zone (HAZ) of steel welds have a great influence on HIC. For example, the martensite formation is related to this phenomenon, [8][9][10] so to avoid or mitigate HIC, materials are selected and/or the welding process is designed to inhibit the formation of this microconstituent.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Diffusivity in the Welding Zone of Two High Strength Experimental Microalloyed Steels

et al. 2015

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Using permeation tests, determination of hydrogen trapping and microhardness measurements, the effect of the microstructure on the hydrogen diffusivity was analyzed in the welding zone of two highstrength experimental microalloyed steels called M1 steel, with a martensite and bainite microstructure and M2 steel with a quasi-polygonal ferrite (QPF), acicular ferrite (AF) and martensite-austenite (M/A) microstructure. Determination of the diffusivity was performed using electrochemical permeation tests, and hydrogen traps were determined with the silver decoration technique.One-pass welds without filler material were simulated with the Gas Tungsteng Arc Welding (GTAW) process, and samples of the welding zone were collected: base material (BM), heat affected zone (HAZ) and fusion zone (FZ). A Devanathan and Stachurski type electrochemical cell was constructed to conduct permeation tests. From the microstructural analysis, the permeation testing and silver decoration, it was observed that the hydrogen diffusivity decreases with the increase in traps, promotion of the formation of the M/A microconstituent and AF and the reduction of martensite and bainite microconstituents. The lower diffusivity of all zones of both steels is presented by the BM of M2 steel, which is associated with a QPF, AF and M/A microstructure and low microhardness. The highest relative amount of traps are in the coarse grained heat affected zone (CGHAZ) of both steels, however because these are reversible traps, these subzones could be the most susceptible to hydrogen induced cracking (HIC).

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Role of microstructure, composition and hardness in resisting hydrogen embrittlement of fastener grade steels

Cited by 87 publications

References 19 publications

The Impact of Nb, Ti, Zr, B, V, and Mo on the Hydrogen Diffusion in Four Different AHSS/UHSS Microstructures

The Impact of Nb, Ti, Zr, B, V, and Mo on the Hydrogen Diffusion in Four Different AHSS/UHSS Microstructures

A Contextualização Sociocultural Na Educação Matemática No Ensino Fundamental Nas Séries Finais

Hydrogen Diffusivity in the Welding Zone of Two High Strength Experimental Microalloyed Steels

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