Metallography
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Fatigue characterization of Titanium Ti-6Al-4V samples produced by Additive Manufacturing Open
Additive Manufacturing offers real opportunities in Thales, since it enables a flexible and cost-effective production of metallic components directly from a 3D digital data model. The manufacture of the parts, layer by layer, allows buildi…
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On the Al–Al11Ce3 Eutectic Transformation in Aluminum–Cerium Binary Alloys Open
The L ↔ Al + Al11Ce3 technologically important eutectic transformation in Al–Ce binary alloys, containing from 5 to 20 wt.% Ce and ranging from hypo- to hypereutectic compositions, was examined along with the microstructure and properties …
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In-situ detection of redeposited spatter and its influence on the formation of internal flaws in laser powder bed fusion Open
The pervasive adoption of laser powder bed fusion (LPBF) as an industrial manufacturing technique relies on the improvement of its repeatability, currently limited by the stochastic formation of flaws. Considering that large flaws can form…
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Austenite formation and cementite dissolution during intercritical annealing of a medium-manganese steel from a martensitic condition Open
In the present study, in situ high-energy X-ray diffraction (HEXRD), dilatometry, and metallography were conducted for the purpose of understanding microstructure evolution during intercritical annealing of a Fe-0.19C-4.39Mn steel from a m…
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Diffraction Contrast Tomography in the Laboratory – Applications and Future Directions Open
Determining 3D crystallographic information holds tremendous value for 3D materials science because the properties and performance of materials are intricately linked to microstructural morphology. Conventional 2D approaches (for example, …
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Failure analysis and simulation model of pinhole corrosion of the refined oil pipeline Open
A new approach has been developed to conduct failure analysis of pinhole corrosion in pipelines using the normal material failure method and corrosion environment simulations during a full life cycle of the pipeline. A 277 km long DN 355.6…
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The Influence of Heat Input on the Microstructure and Properties of Wire-Arc-Additive-Manufactured Al-Cu-Sn Alloy Deposits Open
In this experiment, Al-Cu-Sn alloy was used as raw material to form deposits with different heat input using the wire-arc additive manufacturing (WAAM) process. The effects of heat input on microstructure and mechanical properties of Al-Cu…
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Comparison of Linear and Nonlinear Ultrasonic Parameters in Characterizing Grain Size and Mechanical Properties of 304L Stainless Steel Open
Ultrasonic nondestructive techniques can be used to characterize grain size and to evaluate mechanical properties of metals more practically than conventional destructive optical metallography and tensile tests. Typical ultrasonic paramete…
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Influence of Powders and Process Parameters on Bonding Shear Strength and Micro Hardness in Laser Cladding Remanufacturing Open
Laser cladding technology has been proved an effective method to remanufacture the damaged parts by cladding high performance materials. The type of alloy powders, laser output power, and scanning speed were selected as influencing factors…
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Automated segmentation of martensite-austenite islands in bainitic steel Open
So far, the qualitative and quantitative analysis of bainite has to be carried out by a metallography specialist and often causes ambiguities coming along with poor reproducibility. Possible reasons for a high variance in the description o…
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Detection and Estimation of Retained Austenite in a High Strength Si-Bearing Bainite-Martensite-Retained Austenite Micro-Composite Steel after Quenching and Bainitic Holding (Q&B) Open
To develop an advanced high strength steel with reasonable ductility based on low alloying concept as well as micro-composite microstructure essentially consisting of bainite, martensite and retained austenite, a Si-bearing, low alloy medi…
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Ferrite Quantification Methodologies for Duplex Stainless Steel Open
In order to quantify ferrite content, three techniques, XRD, ferritoscope and optical metallography, were applied to a duplex stainless steel UNS S31803 solution-treated for 30 min at 1,000, 1,100 and 1,200 °C, and then compared to equilib…
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Effects of Minimal Quantity Lubrication (MQL) on Surface Integrity in Robotic Milling of Austenitic Stainless Steel Open
Robotic milling is considered to be a promising portable manufacturing technology for large scale part manufacturing industries such as nuclear, aerospace and power generation. However, considering the open environment of robotic milling, …
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Submerged Friction Stir Welding of 6061-T6 Aluminium Alloy under Different Water Heads Open
The aim of this paper is to determine the feasibility of submerged friction stir welding of 6061-T6 aluminium alloy on different water heads through macrostructuralanalysis.In this work, aluminium 6061-T6 alloy was friction stir welded und…
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Methods for the measurement of ferrite content in multipass duplex stainless steel welds Open
The phase balance is commonly determined as a part of the duplex stainless steel (DSS) welding procedure qualification. In this work, the aim was to find a reliable, but still fast method to measure the ferrite content of DSS welds. Four m…
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Evaluation of Failure Pressure for Gas Pipelines with Combined Defects Open
The paper presents the study of the influence of mechanical damage on the safe operation of gas transmission pipelines. The main types of pipeline damage with the actual parameters and their influence on the operational parameters are anal…
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Replacement of silicon by aluminum with the aid of vanadium for galvanized TRIP steel Open
Silicon existence in conventional low carbon TRIP steel is essential for inhibiting cementite precipitation, despite that it tends to obstruct the hot-dip galvanizing process. Aluminum is considered the mostly preferable substituent of sil…
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Effect of welding speed on friction stir welds of GL E36 shipbuilding steel Open
The aim of this study was to characterize mechanical and microstructural characteristics of friction-stir-welded GL E36 shipbuilding steel. The tool rotational speed was kept constant at 500 rpm and different welding speeds were used (1, 2…
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Influence of the scanning strategy parameters upon the quality of the SLM parts Open
Publication in the conference proceedings of EUSIPCO, Florence, Italy, 2006
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Characterization and Analysis of Porosities in High Pressure Die Cast Aluminum by Using Metallography, X-Ray Radiography, and Micro-Computed Tomography Open
Mechanical performance of cast aluminum alloys is strongly affected by the defects formed during solidification. For example, fractography studies of the fatigue specimens have shown that fatigue failure in aluminum castings containing def…
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The effect of alloying method on the structure and properties of sintered stainless steel Open
Sintered duplex stainless steels (SDSSs) appear to be very interesting and promising materials that can be used in many industrial sectors. Ferrite improves material strength while austenite increases hardness and corrosion resistance. Thi…
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Electron Beam Based Additive Manufacturing of Alloy 247 for Turbine Engine Application: From Research towards Industrialization Open
In this contribution it will be shown how the metal powder bed fusion technology electron beam melting (EBM) enables a successful crack- and defect-free processing of the non-weldable Ni-based superalloy Alloy 247. Besides a defect-free pr…
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Image Processing of Mg-Al-Sn Alloy Microstructures for Determining Phase Ratios and Grain Size and Correction with Manual Measurement Open
The study of microstructures for the accurate control of material properties is of industrial relevance. Identification and characterization of microstructural properties by manual measurement are often slow, labour intensive, and have a l…
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Influence of Cooling Rate on Microstructure Formation of Si–Mo Ductile Iron Castings Open
The present study highlights the effect of the cooling rate on the microstructure formation of Si–Mo ductile iron. In this study, experiments were carried out for castings with different wall thicknesses (i.e., 3, 5, 13, and 25 mm) to achi…
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Microstructure Evolution in a 6082 Aluminium Alloy during Thermomechanical Treatment Open
Thermomechanical treatments of age-hardenable wrought aluminium alloys provoke microstructural changes that involve the movement, arrangement, and annihilation of dislocations, the movement of boundaries, and the formation or dissolution o…
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The Effect of Initial Structure on Phase Transformation in Continuous Heating of a TA15 Titanium Alloy Open
The effect of initial structure on phase evolution in continuous heating of a near-α TA15 titanium alloy (Ti-6Al-2Zr-1Mo-1V) was experimentally investigated. To this end; three microstructures were obtained by multiple heat treatment: I-bi…
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Effect of the cooling rate in the medium temperature zone on the phase transformation and microstructure of carbide-free bainitic steel Open
Controlling continuous cooling is considered an effective means of producing high-strength and high-toughness bainitic steel. A medium carbon bainite frog steel is designed. By combining a thermal dilatometer with in-situ high-temperature …
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Failure analysis of a diesel generator connecting rod Open
This paper presents the results of a failure analysis investigation conducted in a connecting rod from a diesel engine used in the generation of electrical energy. The investigation included an extensive analysis of the con-rod material as…
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Comparison of Additively Manufactured vs. Conventional Maraging Steel in Corrosion-Fatigue Performance after various surface treatments Open
Additive manufacturing (AM) exhibits some inherent processing characteristics that affect the grain structure, phase formation, microstructure, roughness and porosity, compared to conventionally manufactured components. Consequently, the s…
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Austenite Decomposition of a Lean Medium Mn Steel Suitable for Quenching and Partitioning Process: Comparison of CCT and DCCT Diagram and Their Microstructural Changes Open
The present work deals with the dilatometric study of a hot-rolled 0.2C3Mn1.5Si lean medium Mn steel, mainly suitable for the quenching and partitioning (Q&P) heat treatment in both hot-rolled or cold-rolled condition, subjected to a varia…