Methods of the Detection and Identification of Structural Defects in Saturated Metallic Composite Castings

Gawdzińska, K.

doi:10.1515/afe-2017-0087

Cited by 6 publications

(4 citation statements)

References 7 publications

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“…• SMARTER method (Specific, Measurable, Achievable, Relevant or Realistic or Rewarding, Time-bound, Exciting or Evaluated, Recorded or Reward) (Lawlor & Hornyak, 2012); • Method for selecting a team of experts (Kupraszewicz & Zółtowski, 2002;); • Brainstorming (BM) (Putman & Paulus, 2008); • Causes-and-effects diagram (Ishikawa diagram or herringbone diagram) (Chokkalingam et al, 2017;Gawdzińska, 2011); • FAHP method (Fuzzy Analytic Hierarchy Process) (Katunin et al, 2021;Siwiec & Pacana, 2021d); • FTOPSIS method (Fuzzy Technique for Order of Preference by Similarity to Ideal Solution) (Jarosińska & Berczyński, 2021;Khedmatgozar et al, 2021;Minutolo et al, 2019).…”

Section: Assumptions Of the Modelmentioning

confidence: 99%

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Fuzzy Multi-criteria Decision Model to Support Product Quality Improvement

Siwiec,

Gawlik,

Pacana

2023

Management and Production Engineering Review

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Improving product quality while making decisions remains a challenge. The objective of this research was to develop a model that supports the precise enhancement of product quality through comprehensive analysis of possibilities, product incompatibilities, root causes, and recommended improvement actions. The model incorporated various tools and methods such as the SMARTER method, expert team selection, brainstorming, Ishikawa diagram, 5M+E rule, FAHP, and FTOPSIS methods. The study demonstrated that integrating quality management tools and decision-making methods into a unified model enables the accurate prioritization of activities for product quality management. This integrated approach represents the novelty of this research. The model was evaluated using a mechanical seal made of 410 alloy. The research findings can be valuable to enterprises seeking to enhance product quality at any stage of production, particularly for modified or new products.

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Section: Assumptions Of the Modelmentioning

confidence: 99%

“…The team evaluates all improvement actions using the multiple voting technique and fuzzy scales. The assessments provided by the T th expert for improvement action A i and the group of main causes C j are noted using formula (5) (Alt et al, 2019;Gawdzińska, 2011;Pacana et al, 2020):…”

Section: Stage 6 Determining Improvement Actionsmentioning

confidence: 99%

Fuzzy Multi-criteria Decision Model to Support Product Quality Improvement

Siwiec,

Gawlik,

Pacana

2023

Management and Production Engineering Review

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“…The overall quality is a matter of dimensional accuracy, surface finish, and internal soundness. To achieve the desired and exceptional range of mechanical properties, casting should be free of internal defects, both in macro and micro scale [2][3][4][5][6]. To find the first group of defects, the Non-Destructive Testing (NDT) methods like Ultrasonic Testing (UT) or Radiography Testing (RT) can be employed, which nowadays is quite a traditional approach [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Archives of Foundry Engineering

Jezierski,

Dojka,

Stawarz

et al. 2022

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Nowadays, the best castings' manufacturers have to meet very demanding requirements and specifications applicable to mechanical properties and other characteristics. To fulfill those requirements, more and more sophisticated methods are being used to analyze the internal quality of castings. In many cases, the commonly used Non-Destructive Methods, like X-ray or ultrasonic testing, are not enough to ensure precise and unequivocal evaluation. Especially, when the properties of the casting only slightly fail the specification and the reasons for such failures are very subtle, thus difficult to find without the modern techniques. The paper presents some aspects of such an approach with the use of Scanning Electron Microscopy (SEM) to analyze internal defects that can critically decrease the performance of castings. The paper presents the so-called bifilm defects in ductile and chromium cast iron, near-surface corrosion caused by sulfur, micro-shrinkage located under the risers, lustrous carbon precipitates, and other microstructure features. The method used to find them, the results of their analysis, and the possible causes of the defects are presented. The conclusions prove the SEM is now a powerful tool not only for scientists but it is more and more often present in the R&D departments of the foundries.

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“…Nonmetallic inclusions in the material or poor-quality material joints can also reduce the service life of lids [ 40 , 41 , 42 ]. To determine if this is the cause of the damage, studies must be carried out and the results compared [ 43 ].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Root Causes of Damage to the Edges of Tank Manholes on the Main Deck of Handy-Size Bulk Carriers

Chybowski

Gawdzińska

2021

Materials

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This study analyzes the root causes of cracks in the deck plating around tank manholes. Four handy-size bulk carriers built in one shipyard were analyzed. In all cases, deck cracks were found near manholes, and the average time from the commencement of operation until the occurrence of cracks was 1356 days. Due to this short wear-life of the vessel’s structural material, the authors believed that it was unlikely to be caused by corrosion fatigue. The authors hypothesized that main decks cracked around manholes because of very poor-quality welded joints and poor-quality steel (large amounts of non-metallic impurities) used to make the manholes. In order to verify this hypothesis, on each of the vessels, material samples were collected from near the cracks and then examined thoroughly. Each sample was subjected to the macroscopic examination of the natural surfaces of cracks and their vicinity, microscopic examination of the material, mechanical property tests, and scanning electron microscope fractography for samples obtained after impact tests. The examination and test results were used to draw detailed conclusions for each case study. The general conclusions based on examination of the whole damage population validated the authors’ hypothesis that main decks cracked around manholes because of very poor-quality welded joints and poor-quality steel used to make the manholes.

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Methods of the Detection and Identification of Structural Defects in Saturated Metallic Composite Castings

Cited by 6 publications

References 7 publications

Fuzzy Multi-criteria Decision Model to Support Product Quality Improvement

Fuzzy Multi-criteria Decision Model to Support Product Quality Improvement

Archives of Foundry Engineering

Analysis of the Root Causes of Damage to the Edges of Tank Manholes on the Main Deck of Handy-Size Bulk Carriers

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