A criterion for cracking during solidification

Kou, Sindo

doi:10.1016/j.actamat.2015.01.034

Cited by 561 publications

(310 citation statements)

References 19 publications

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“…[10] and Kou [11] derived hot cracking criteria during solidification including microstructural effects. A mass balance was evaluated over the liquid and solid phases, which accounts for the tensile deformation of the solid skeleton perpendicular to the growing dendrites and for induced inter-dendritic liquid feeding.…”

Section: Introductionmentioning

confidence: 99%

Hot cracking investigation during laser welding of high-strength steels with multi-scale modelling approach

Gao

Agarwal

Amirthalingam

et al. 2018

Science and Technology of Welding and Joining

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Hot cracking during laser welding of advanced high-strength steels is reported to be a serious problem by automotive manufacturers. In this work, hot cracking susceptibilities of transformation-induced plasticity (TRIP) and dual-phase (DP) steels are studied based on a multiscale modelling approach. Transient temperatures measured from welding experiments are used to validate a finite element (FE) model. The temperature, thermal gradient and cooling rate in the weld fusion zone are extracted from the FE model and pre-defined as boundary conditions to a phase field model. The welding-induced microstructural evolution is simulated considering thermodynamic and mobility data. Results show that, compared to the DP steel, the TRIP steel has a broader solidification range, a greater pressure drop at the inter-dendritic regions, and an increased phosphorus segregation at the grain boundaries; all these make this steel more susceptible for hot cracking. ARTICLE HISTORY

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Section: Introductionmentioning

confidence: 99%

Hot cracking investigation during laser welding of high-strength steels with multi-scale modelling approach

Gao

Agarwal

Amirthalingam

et al. 2018

Science and Technology of Welding and Joining

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“…Reduction applied at the end of solidification (such as soft reduction, heavy reduction) has turned out to be quite effective. However, it is noteworthy that the mushy zone in which the soft reduction is used, has a poor plasticity and is prone to become the origin where most cracks can be found in continuous casting . Furthermore, soft reduction is about to increase the tensile stress and generate more cracks in the mushy zone …”

Section: Introductionmentioning

confidence: 99%

Effects of Reduction Pretreatment on the Internal Quality of Casting Billets

Wang

Cai

et al. 2016

steel research int.

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Reduction pretreatment is a novel process to improve the internal quality of casting slabs, in which limited works are available. This paper therefore examines the application of reduction pretreatment to casting billets to investigate the improvement of microstructures and properties. The casting billets obtained with/without the reduction pretreatment were measured to reveal the effects of this technique. The results indicate that, a certain amount of reduction pretreatment is capable of closing porosity, accelerating diffusion, and crushing dendrites. Moreover, the ductility of the billet is increased with the improvement of the porosity, segregation, and microstructure. It is noteworthy, however, some cracks might be generated due to excessive amounts of reduction.

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“…On the microscale level, Rappaz [7] proposes that a hot tear between columnar dendrites is formed as a result of a localized strain transmitted by the coherent dendrites. Kou [8] states that hot cracking is caused by tensile deformation induced in the semisolid region along grain boundaries when liquid is not sufficiently fed. Wang [9] concludes that the segregation and morphology of liquid channels in the last stages of solidification make materials more susceptible to hot cracking.…”

Section: Introductionmentioning

confidence: 99%

Investigation on hot cracking during laser welding by means of experimental and numerical methods

et al. 2017

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Hot cracking during laser welding of Transformation Induce Plasticity (TRIP) steel at the edges of steel flanges can be a problem. In this study, modified hot cracking tests were performed by welding on a single-side clamped specimen at various distances from the free edge, while the heat input and external constraints remained constant. In situ temperature and strain measurements were carried out using pre-attached thermocouples and digital image correlation, respectively. A thermal-mechanical finite element (FE) model was constructed and validated with the temporal and spatial data measured. From the validated FE model, the temperature and strain evolution in the weld mushy zone were studied. A critical strain for the onset of hot cracking in the TRIP steel examined was found to be in the range of 3.2 to 3.6%. This threshold was further evaluated and experimentally confirmed by welding with different heat inputs.

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A criterion for cracking during solidification

Cited by 561 publications

References 19 publications

Hot cracking investigation during laser welding of high-strength steels with multi-scale modelling approach

Hot cracking investigation during laser welding of high-strength steels with multi-scale modelling approach

Effects of Reduction Pretreatment on the Internal Quality of Casting Billets

Investigation on hot cracking during laser welding by means of experimental and numerical methods

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