Diffusion of Hydrogen in the TRIP 800 Steel

Sojka, Jaroslav; Váňová, Petra; Vodárek, Vlastimil; Sozańska, M.

doi:10.1016/j.mspro.2016.03.012

Cited by 8 publications

(3 citation statements)

References 4 publications

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“…Considering that, the di usion of oxygen, hydrogen, and water in the gas phase is much faster than in the solid phase, D O = D O = D H 2 O = 10 −8 m 2 s −1 have been used. e value of D H for the solid phase is taken from [75]. e value of D O for solid phases is based on D O = 3.7 × 10 −7 e −Q/Rθ , with Q = 98000 J/mol [59], again at θ = 973.15 K. Whereas D O is assumed constant here, note that M O = D O (∂ 2…”

Section: Constant Parameter Valuesmentioning

confidence: 99%

Chemo-Mechanical Phase-Field Modeling of Iron Oxide Reduction with Hydrogen

Yang¹,

Mianroodi²,

Ma³

et al. 2021

Preprint

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e reduction of iron ore with carbon-carriers is one of the largest sources of greenhouse gas emissions in the industry, motivating global activities to replace the coke-based blast furnace reduction by hydrogen-based direct reduction (HyDR). Iron oxide reduction with hydrogen has been widely investigated both experimentally and theoretically.e process includes multiple types of chemical reactions, solid state and defect-mediated di usion (by oxygen and hydrogen species), several phase transformations, as well as massive volume shrinkage and mechanical stress buildup. However, studies focusing on the chemo-mechanical interplay during the reduction reaction in uenced by microstructure are sparse. In this work, a chemo-mechanically coupled phase-eld (PF) model has been developed to explore the interplay between phase transformation, chemical reaction, species di usion, large elastoplastic deformation and microstructure evolution. Energetic constitutive relations of the model are based on the system free energy which is calibrated with the help of a thermodynamic database. e model has been rst applied to the classical core-shell (wüstite-iron) structure. Simulations show that the phase transformation from wüstite to α-iron can result in high stress and rapidly decelerating reaction kinetics. Mechanical stresses can contribute elastic energy to the system, making phase transformation di cult. us slow reaction kinetics and low metallization are observed. However, if the stress becomes comparatively high, it can shi the shape of the free energy from a double-well to a single-well case, speed up the transformation and result in a higher reduction degree than the lower stress case.e model has been further applied to simulate an actual iron oxide specimen with its complex microstructure, characterized by electron microscopy.e experimentally observed microstructure evolution during reduction is well predicted by the model. e simulation results also show that isolated pores in the microstructure are lled with water vapor during reduction, an e ect which in uences the local reaction atmosphere and dynamics.

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Section: Constant Parameter Valuesmentioning

confidence: 99%

Chemo-Mechanical Phase-Field Modeling of Iron Oxide Reduction with Hydrogen

Yang¹,

Mianroodi²,

Ma³

et al. 2021

Preprint

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“…The diffusion of hydrogen spontaneously assists cracks initiation and propagation, eventually leading to fracture of the formed parts at low stress levels . Diffusible hydrogen and residual stress are the two key factors affecting hydrogen embrittlement . The elongation loss due to hydrogen charging is a typical parameter to evaluate the hydrogen embrittlement susceptibility of metallic materials.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

The Role of Transformation‐Induced Plasticity in the Development of Advanced High Strength Steels

Liu

Huang

2018

Adv Eng Mater

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Lightweight structural components made of advanced high-strength steels (AHSSs) in the automotive industry can substantially reduce greenhouse gas emissions. The 3rd-generation AHSSs, which consist of medium Mn steel, quenching and partitioning (Q&P) steel, and carbide-free bainitic (CFB) steel, is the current research focus of the steel community. In particular, the retained austenite grains are the intrinsic components of the 3rd-generation AHSSs. These retained austenite grains can demonstrate a transformationinduced plasticity (TRIP) effect by transforming into martensite during mechanical loading, improving the strain-hardening behavior of AHSSs. Consequently, intensive research has been carried out over the past 30 years to understand the role of the TRIP effect on the development of AHSSs. Therefore, this review article is aimed to provide a state-of-the-art summary of recent progress on AHSSs with the TRIP effect. Specifically, the processing, the relationship between microstructure and mechanical properties, and the potential industrial applications of TRIP-enabled AHSSs will be addressed in this review. More importantly, the mechanical stability of the retained austenite grains, which determines the overall performance of the TRIP effect in AHSSs, will be discussed by considering several governing factors.

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“…TRIP çeliklerinde yüksek gerilimlerde kalıntı östenitin martensite dönüşümünden dolayı artan bir sertleşme oranı meydana gelir. Sahip olduğu bu yapı-özellik ilişkisi nedeniyle örneğin; B sütunu, motor beşiği, ön ve arka raylar gibi özellikle çarpmaya dayanıklı otomotiv yapısal bileşenlerinde kullanımı uygundur [6][7][8][9].…”

Section: Introductionunclassified

Influence of Different Shielding Gas Flow Rate in MIG-Brazed Joints of TRIP 800 Steel Plates

Ferik¹,

Varol²,

Aslanlar³

2022

acperpro

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Bu çalışmada, 1,5 mm kalınlığa sahip TRIP 800 çelik plakaları bakır esaslı S Cu 6100 (CuAl8) teliyle gaz metal ark lehimleme yöntemiyle birleştirilmiştir. Numuneler, bindirme birleştirme formunda hazırlanmıştır. Koruyucu gaz olarak argon kullanılmıştır ve lehimleme işlemleri 8, 10, 12, 14 ve 16 L/dk koruyucu gaz çıkış hızında yapılmıştır. Birleştirme noktalarının çekme dayanımı belirlenmiştir ve TRIP 800 çeliğinin gaz metal ark lehimleme tekniğiyle farklı koruyucu gaz çıkış hızlarında birleşebilirliğini görmek için birleştirme noktalarının mikro ve makroyapıları optik mikroskopta incelenmiştir.

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Diffusion of Hydrogen in the TRIP 800 Steel

Cited by 8 publications

References 4 publications

Chemo-Mechanical Phase-Field Modeling of Iron Oxide Reduction with Hydrogen

Chemo-Mechanical Phase-Field Modeling of Iron Oxide Reduction with Hydrogen

The Role of Transformation‐Induced Plasticity in the Development of Advanced High Strength Steels

Influence of Different Shielding Gas Flow Rate in MIG-Brazed Joints of TRIP 800 Steel Plates

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