Role of Steel Plate Thickness on the Residual Stress Formation and Cracking Behavior During Flame Cutting

Jokiaho, Tuomas; Santa-aho, Suvi; Peura, Pasi; Vippola, Minnamari

doi:10.1007/s11661-019-05314-w

Cited by 9 publications

(12 citation statements)

References 18 publications

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“…Thicker plates tend to have more segregations in the center region compared to thinner plates. In a previous study, [6] the segregation locations were found to have lower impact toughness and the fracture surfaces of the test samples showed more signs of brittle behavior compared to the surrounding regions.…”

Section: Introductionmentioning

confidence: 69%

“…The lowest hardness occurs just after the two-phase region and then the hardness gradually increases as the tempering of the original structure decreases while going deeper toward the subsurface. [6,7] Both the hardness and the microstructure of the tempered region depend on the original microstructure of the steel plate. [6] In addition to microstructural changes and hardness variations, flame cutting causes high residual stresses in the cut edge of the steel plate.…”

Section: Introductionmentioning

confidence: 99%

“…[6,7] Both the hardness and the microstructure of the tempered region depend on the original microstructure of the steel plate. [6] In addition to microstructural changes and hardness variations, flame cutting causes high residual stresses in the cut edge of the steel plate. Residual stresses arise from local structural constraints inside the material or component.…”

Section: Introductionmentioning

confidence: 99%

“…[8] Transformation stresses arise from different microstructural transformations, which are accompanied by volume changes. [8] Previous studies [6,7,[9][10][11] have shown that flame cutting causes both residual compressive stress and high-tensile stress in the cut edge of the steel plate. The compressive stress is produced in the martensite region close to the cut edge and it is followed by high-tensile stress region in the tempered region.…”

Section: Introductionmentioning

confidence: 99%

“…[7] The magnitude of the stresses and the width of these regions can be affected by the flame cutting parameters, [9,10] grain structure, [7] and the thickness of the plate. [6] In the worst case, flame cutting causes cracking of the cut edge. Cracks have been observed [7] to form close to the centerline of the plates.…”

Section: Introductionmentioning

confidence: 99%

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Cracking and Failure Characteristics of Flame Cut Thick Steel Plates

Jokiaho

Santa-aho

Peura

et al. 2020

Metall Mater Trans A

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The manufacturing of thick wear-resistant steel plates commonly leads to a layered structure and non-uniform properties in the thickness direction which makes the processing and utilization of the plates problematic. The processing steps of thick plates include flame cutting, which generates a heat-affected zone and high residual stresses into the cut edge. In the worst case, the cutting causes cracking. However, the residual stress level alone is not high enough to break a wear-resistant steel plate that behaves normally. Therefore, high-tensile stress also requires a microstructurally weak factor for crack initiation. For this reason, the main objective of this study is to reveal the main microstructural reasons behind the cracking of plates in flame cutting. To achieve this, plate samples containing cracks are mechanically tested and analyzed by electron microscopy. The results show that cracks are commonly formed horizontally into the tempered region of the heat-affected zone. Cracks initiate in the segregations, which typically have a higher amount of impurity and alloying elements. Increased impurity and alloying content in the segregations decreases the cohesion of the prior austenite grain boundaries. These weakened grain boundaries combined with high-residual tensile stress generate the cracks in the flame-cutting process.

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Section: Introductionmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Cracking and Failure Characteristics of Flame Cut Thick Steel Plates

Jokiaho

Santa-aho

Peura

et al. 2020

Metall Mater Trans A

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Study on Wear Resistance Performance along the Thickness Direction of In Situ TiC‐Reinforced High‐Strength Steel

Ning

Niu

et al. 2022

steel research int.

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The hardness of high‐strength steel gradually decreases from the subsurface layer to the layer that is half its thickness. This hardness distribution reduces the wear resistance of steel plates. To date, there have been few reported solutions to this problem. Herein, an in situ approach is used to prepare TiC‐reinforced steel. The findings demonstrate that the introduction of TiC reinforcement enhances the wear resistance performance along the thickness direction of high‐strength steel. Although the hardness of TiC‐reinforced steel gradually decreases from the surface to the core, the wear resistance of the steel initially increases before decreasing. In addition, compared with normal steel, the wear resistance performance of TiC‐reinforced steel is increased by 15% at the subsurface, 24% at 1/4 thickness, and 31% at 1/2 thickness. This unusual phenomenon is attributed to the size features of TiC, which vary along the thickness of the plate. The proportion of small TiC particles decreases from the subsurface layer to the core, whereas the proportion of large TiC particles increases gradually. This technique can provide an avenue for improving the wear resistance of other large‐thickness wear‐resistant materials along the thickness direction.

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