Transformation kinetics of ferrous weld metals

Thewlis, G.

doi:10.1179/026708394790163834

Cited by 40 publications

(43 citation statements)

References 7 publications

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“…In this regard, TiN particles shouldn't be omitted, but it seems that they are less potent as nucleation sites, since crystal lattices misfit ratio with ferrite (3.8 %) is higher than in the case of VN (1.3 %). 10) This consideration and present results support earlier findings that VN particles are preferential sites for intragranular nucleation of acicular ferrite. In fact, VN precipitates on the manganese sulfide particles which then act as sites for the intragranular nucleation of acicular ferrite.…”

Section: The Effect Of Vanadium On Microstructuresupporting

confidence: 92%

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Influence of Reheating Temperature and Vanadium Content on Transformation Behavior and Mechanical Properties of Medium Carbon Forging Steels

et al. 2010

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Section: The Effect Of Vanadium On Microstructuresupporting

confidence: 92%

“…10) Segregation of vanadium toward austenite grain boundaries also was confirmed. 7) However, it has been considered by some authors that vanadium actually suppresses bainite formation by preventing the nucleation of coarse grain boundary plate structure.…”

Section: The Effect Of Vanadium On Microstructurementioning

confidence: 82%

Influence of Reheating Temperature and Vanadium Content on Transformation Behavior and Mechanical Properties of Medium Carbon Forging Steels

et al. 2010

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“…This is only predominant in the range of γ grain sizes below 100 μm, because the surface area of grain boundaries per unit volume drastically decreases in this range. 1,2) The results shown in Fig. 9 indicate an opposite trend of γ grain sizes in the range above 500 μm.…”

Section: Residual Deoxidant Elementsmentioning

confidence: 88%

“…Thewlis 1) has performed extensive experiments and observed the relationships among volume fractions of acicular ferrite, austenite grain size and the number, size and composition of inclusions. His results suggest that the maximum fraction of acicular ferrite can be achieved at an optimum austenite grain size, which depends on the alloy elements of the steel weldment and the inclusion type.…”

Section: Introductionmentioning

confidence: 99%

Influence of Oxide Particles and Residual Elements on Microstructure and Toughness in the Heat-Affected Zone of Low-Carbon Steel Deoxidized with Ti and Zr

Suito

Karasev

Hamada³

et al. 2011

ISIJ Int.

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The microstructure and toughness in Fe-0.04%C-1.85%Mn-0.03%Si-0.018%Nb steel deoxidized with Ti and Zr have been studied as functions of particle characteristics, austenite grain size and soluble Ti and Zr contents using a simulated HAZ (heat affected zone) thermal cycle (peak temperature, 1 400°C; peak holding time, 60 s; time of cooling from 800 to 500°C, 70 s) and submerged arc welding (heat input of 15 kJ/mm), respectively. Microstructures were studied in samples containing 1.0 to 1.5 μm-diameter oxide particles numbering 500 to 2 000 mm -2 and with a soluble oxygen content of 10 to 30 ppm (measured before casting) and soluble Ti and Zr contents of 50-150 ppm. The γ grain size after HAZ thermal cycle in the range between 200 and 600 μm is controlled by pinning and solute drag. Small γ grain size below 300 μm was obtained with high soluble Ti and Zr contents of 110-160 ppm, whereas large γ grain size above 300 μm was obtained with low soluble Ti and Zr contents of 60-110 ppm. Two types of microstructures that showed high Charpy absorbed energy (VE(-10°C)= 150-250 J and VE(-50°C)= 50-150 J) were observed independent of γ grain size: One is acicular ferrite and a small amount of grain boundary ferrite (GBF) and ferrite side plate (FSP) and the other is GBF, FSP and granular bainitic ferrite. It was observed that low VE(T) values are attributed to the formation of porosity, large-size particles, carbides (+nitrides) and lathe bainitic ferrite.

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“…During the welding thermal cycle, base steel close to the fusion area will transform to austenite, martensite, ferrite and/or bainite, depending on the cooling rate [15,16] and steel composition. These different phase microstructures correspond to different mechanical properties [6,17,18]. A weld joint consists of fusion weld area, the HAZ and base area (unwelded).…”

Section: Introduction and Objectivesmentioning

confidence: 99%

Constitutive response of welded HSLA 100 steel

Xue

Benson

Meyers

et al. 2003

Materials Science and Engineering: A

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The dynamic mechanical behavior of a welded joint of high-strength, low alloy (HSLA) 100 steel was investigated by both quasistatic (103 s (1 ) and high strain rate (103 s (1 ) tension loadings at ambient and low temperatures. The constitutive responses for the microstructurally different weld and base steels, along with the interface, which included the heat-affected zone (HAZ), were analyzed and compared. This response is successfully modeled by the mechanical threshold stress (MTS) constitutive equation for different regions of the welded joint, which shows qualitatively different behavior. The necking and failure occurred uniformly within the weld metal but not in the HAZ. The main mechanism for the failure of the welded joints is void growth. Microstructural characterization revealed that the nucleation of voids occurred mainly at the interface between the base and the weld metal, and initiated at inclusions. Measurements of damage distributions across HAZ were made to evaluate the contribution of porosity variation to the constitutive response. In both the quasi-static and dynamic tests, the deformation localization in the form of necking first appeared in the weld metal. Fractographic observation demonstrates that void evolution is a dominant factor in the macroscopic mechanical response. The Gurson Á/Tvergaard model was included in the modeling effort to incorporate the effect of void opening on the mechanical response as well as tensile instability. The MTS constitutive model was successfully implemented to the tensile regime of loading. #

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Transformation kinetics of ferrous weld metals

Cited by 40 publications

References 7 publications

Influence of Reheating Temperature and Vanadium Content on Transformation Behavior and Mechanical Properties of Medium Carbon Forging Steels

Influence of Reheating Temperature and Vanadium Content on Transformation Behavior and Mechanical Properties of Medium Carbon Forging Steels

Influence of Oxide Particles and Residual Elements on Microstructure and Toughness in the Heat-Affected Zone of Low-Carbon Steel Deoxidized with Ti and Zr

Constitutive response of welded HSLA 100 steel

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