Crack Formation during Hot Rolling of Nitrogen Alloyed Duplex Stainless Steels

In this work, the effect of activated tungsten inert gas welding process parameters on the depth of penetration of super duplex stainless steel alloy 2507 has been analyzed using response surface methodology. The design matrix for conducting the experiments was generated using the central composite rotatable design of response surface methodology of design of experiments. The input process parameters like current, torch speed and arc gap were varied at five levels. Based on the generated design matrix, bead-on-plate welds were made on 10-mm-hick super duplex stainless steel plate. The depth of penetration, which is the response in the present analysis, was measured on the samples. A second-order response surface model was developed. Then, response optimization was performed for obtaining the maximum depth of penetration using desirability approach. The validation of the model showed good agreement between the predicted and actual values of depth of penetration.

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“…The ferrite:austenite (F:A) ratio influences the mechanical, chemical and electrochemical properties of SDSS weld joints. 3,4…”

Section: Introductionmentioning

confidence: 99%

Optimization of activated tungsten inert gas welding of super duplex alloy 2507 based on experimental results

Korra

Balasubramanian

Vasudevan

2014

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…The formation of edge cracks is complex, which depends not only on the microscopic factors, such as grain size, surface roughness, and chemical compositions [16][17][18], but also on the operating conditions, such as reduction ratio, friction coefficient, tension, edge trimming, roll bending, and heat treatment [19][20][21][22][23]. In present work, four factors, reduction ratio, tension, work roll diameter, and friction coefficient, were taken into account which were considered to be the parameters having great effect on edge cracks in the industrial manufacture.…”

Section: Methodsmentioning

confidence: 99%

Effect of Processing Parameters on Edge Cracking in Cold Rolling

Yan

Sun

Chen

et al. 2013

Materials and Manufacturing Processes

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Experimental and numerical investigations have been carried out to study the effect of processing parameters on edge cracks in cold rolling process of silicon steels. The onset of edge cracks has been simulated by using finite element method (FEM) based on the GursonTvergaard-Needleman damage model. Factorial design and Taguchi experimental design methods have been proposed to analyze the effects of reduction ratio, tension, work roll diameter, and friction coefficient on the formation of edge cracks. Parametric studies indicated that with the increasing of reduction ratio, friction coefficient, and tension, the crack length increases. A bigger work roll is beneficial to restrict the edge crack growth as well. The rank according to the impact degrees on the crack initiation from high to low is reduction ratio, tension, work roll diameter, and friction coefficient. Meanwhile, the combined effect curve of reduction ratio and tension on crack length was obtained which was validated by the experimental results as well.

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“…The heated slab is called simply slab for convenience. Studies in the hot strip rolling process have traditionally focused on examining metallurgical behavior of material (strip or slab) during rolling [1][2][3][4][5] or establishing the setup model to control the rolling process [6][7][8][9][10][11] under the normal rolling condition, i.e., material between the rolls is deformed straight toward rolling direction. In reality, the material rolled out of the rolls is not always straight.…”

Section: Introductionmentioning

confidence: 99%

An Investigation on the Effect of Design Parameters of Side Guide on Camber in Hot Slab Rolling

Byon

Lee

2014

Materials and Manufacturing Processes

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In this study, we present a systematic approach for examining the effects of the design parameters of the side guide on camber, a phenomenon in which a material with a temperature gradient across its width is bent in the right or the left direction as the material is deformed in the roll gap. A series of finite element (FE) analyses were performed to provide a set of computed values for selected design parameters, such as (i) the length of the side guide, (ii) the diameter of guiding roller attached to the contact face of the side guide, (iii) the pitch of the guiding rollers and (iv) the interference of the guiding roller into the slab, that would decrease significantly the contact time between the slab and the side guide, and reduce the contact force between them. In the FE analyses, the actual sizes of the horizontal rolls (work rolls), vertical rolls (edgers) and side guide were modeled. Based on the results of the FE analyses, the side guide was designed and manufactured for installation in the POSCO No. 2 Hot Strip Mill. When the side guide was installed in front of work roll, camber was reduced dramatically by 57%. The design parameter that had the most influence on camber was the length of the side guide. In terms of side guide durability, the interference of guiding roller into the slab was the most dominant design parameter.

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Crack Formation during Hot Rolling of Nitrogen Alloyed Duplex Stainless Steels

Cited by 7 publications

References 23 publications

Optimization of activated tungsten inert gas welding of super duplex alloy 2507 based on experimental results

Optimization of activated tungsten inert gas welding of super duplex alloy 2507 based on experimental results

Effect of Processing Parameters on Edge Cracking in Cold Rolling

An Investigation on the Effect of Design Parameters of Side Guide on Camber in Hot Slab Rolling

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