Reducing Shrinkage Porosity in High-Performance Steel Castings: Case of an ASME B16.34 Gate Valve Body: Part 1—Analysis, Techniques and Experimental Approach

Mahomed, Nawaz; Kleynhans, Hendrik Andries

doi:10.1007/s40962-018-0226-3

Cited by 12 publications

(2 citation statements)

References 10 publications

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“…The maximum deformation of valve body is 0.41mm under 2.4MPa test pressure. During the original valve design the valve body deformation is controlled under the range of 0.001 times of nominal diameter to protect mechanical seal, that is to say, the gate valve with 700mm nominal diameter has 0.7mm allowable deformation [13][14]. From Figure 3(a) we can see that the designed valve body meet stiffness requirement.…”

Section: Resultsmentioning

confidence: 99%

Strength Analysis and Structure Optimization of Gate Valve Body Based on Finite Element Software

Zhang

Tian

2019

E3S Web Conf.

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Stress concentration zone and maximumdeformation zone ofgate valve at 1.6MPaworking pressure were found out according to strength calculationand analysisby ANSYSsoftware, which proceedsthe processes of modeling, meshing, constraintsdefine, applyingloadsand solving. Design variables,state variablesand optimize targetswere defined by target optimization design function of ANSYS Workbenchin ordertoreveal the influence law of eachdesign variable onthe gate valve body equivalent stress,and the optimal valuesof design variablescould be obtained after calculation. The valve structure was improved and stress concentration was reduced from the perspective of safety and economy,whichcouldprovidea referencefor reliable valvedesign.The shape of the valve body was optimized by topology optimization design in order to achieve the rational use of materials.Researchresultsshow that the maximum stress lies on both sides of the valve rib plateand the stress is beyond thematerial allowable value, but the valve body has little deformation.After optimization the maximum equivalent stress of valve body is decreasedby23.91%and the valvebodyhasuniformstress distribution, the mass of the valve body is reduced by1.4%as well. Material utilization is improvedeffectively,which indicates that the optimizationdesignbased onANSYS Workbenchis highly efficient and reliable.

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Section: Resultsmentioning

confidence: 99%

Strength Analysis and Structure Optimization of Gate Valve Body Based on Finite Element Software

Zhang

Tian

2019

E3S Web Conf.

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“…Reasons include the ability to determine pore morphologies in 3D, and resolutions as low as 1 μm (voxel size) suitable for microporosity detection. For comparison with reference radiographs as per the industry Shrinkage Porosity in Steel Sand Castings: Formation, Classification and Inspection DOI: http://dx.doi.org/10.5772/intechopen.94392 standards, 3D CT scans can be collapsed into equivalent 2D images, using a "thick slab" feature of CT scanning image analysis software [24].…”

Section: Porosity Inspectionmentioning

confidence: 99%

Shrinkage Porosity in Steel Sand Castings: Formation, Classification and Inspection

Mahomed¹

2021

Casting Processes and Modelling of Metallic Materials

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In this Chapter, shrinkage porosity defects in steel castings are analysed, particularly for low carbon, high alloyed steels, which have applications in critical engineering components. It begins with the mechanisms for porosity formation within the solidification contraction phase of the casting cycle, highlighting the importance of feeder design. This is followed by characterisation of the solidification phase of steel alloys, including the evolution of phases, which is important in distinguishing between microstructure and porosity in microscopy analysis. A more detailed discussion of interdendritic feeding and mechanisms for shrinkage micro-porosity is then provided. This leads to the well-established interdendritic flow model and commonly-used thermal criteria for shrinkage porosity prediction. The discussions are then consolidated through the classification of shrinkage porosity in terms of formation mechanisms and morphology, and its causes relating to composition, design and process conditions. Finally, engineering standards for classification and inspection of porosity types and severity levels in steel castings are discussed. Throughout, basic design and process improvement approaches for improving melt feeding during solidification contraction is given, with emphasis on providing practical solutions for prediction and evaluation of shrinkage porosity defects in castings.

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Microstructural Analysis of Cavity Formed in Advanced High-Strength Steel Resistance Spot Welds

Vijayan¹,

Murugan

Son

et al. 2020

J. of Materi Eng and Perform

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Reducing Shrinkage Porosity in High-Performance Steel Castings: Case of an ASME B16.34 Gate Valve Body: Part 1—Analysis, Techniques and Experimental Approach

Cited by 12 publications

References 10 publications

Strength Analysis and Structure Optimization of Gate Valve Body Based on Finite Element Software

Strength Analysis and Structure Optimization of Gate Valve Body Based on Finite Element Software

Shrinkage Porosity in Steel Sand Castings: Formation, Classification and Inspection

Microstructural Analysis of Cavity Formed in Advanced High-Strength Steel Resistance Spot Welds

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