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- 저자 : Terner, Mathieu (검색결과 10 건)
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Influence of Gas Metal Arc Welding Parameters on the Bead Properties in Automatic Cladding
TERNER, Mathieu,BAYARSAIKHAN, Tsend-Ayush,HONG, Hyun-Uk,LEE, Je-Hyun The Korean Welding and Joining Society 2017 대한용접·접합학회지 Vol.35 No.1
Gas Metal Arc Welding is a widely used process in Industry due to its high productivity and potential to automation. The present study investigates the effects of the welding speed, arc voltage, welding current and shielding gas on the bead geometry for a low-carbon steel. The Response Surface Methodology (RSM) is used to choose an experimental design and perform test runs accordingly in order to produce mathematical models predicting the geometry, the hardness and the heat input of the bead as functions of the welding parameters. The direct and interaction effects of the four welding parameters are represented graphically and allow to determine an optimum set of welding parameters.
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On the role of alloying elements in the formation of serrated grain boundaries in Ni-based alloys
Terner, M.,Hong, H.-U.,Lee, J.-H.,Choi, B.-G. HANSER 2016 INTERNATIONAL JOURNAL OF MATERIALS RESEARCH Vol.107 No.3
<P>Ni-based model alloys were used to study the effect of alloying elements, namely Cr, Mo, C and Zr on the occurrence of grain boundary serration. The model alloys were free of aluminum to exclude precipitation of second-phase theta'. Similarly, the carbon content was very low, when present, to prevent precipitation of carbides. A special heat treatment involving slow cooling was used to promote grain boundary serration. No significant sign of serration was observed for Ni-10Cr-10Mo, Ni-20Cr-10Mo and Ni-10Cr10-Mo-0.05C model alloys. However, substantial serration was observed for Ni-10Cr-10Mo-0.5Zr and Ni-20Cr-0.5Zr model alloys. Serrated grain boundaries were observed in the absence of either gamma' or carbides. Zirconium-rich precipitates were recognized at serrated grain boundaries though their involvement in the occurrence of serration was doubtful. A mechanism of grain boundary serration formation is proposed.</P>
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The Current State, Outcome and Vision of Additive Manufacturing
Terner, Mathieu The Korean Welding and Joining Society 2015 대한용접·접합학회지 Vol.33 No.6
Additive Manufacturing defines the fabrication of objects by successive consolidation of materials, layer by layer, according to a three-dimensional design. The numerous technologies available today were recently standardized into seven categories based on the general method. Each technology has its own set of advantages and limitations. Though it very much depends on the field of application, major assets of additive manufacturing compared to conventional processing routes are the ability to readily offer complexity (in terms of intricate shape and customization) and significant reduction of waste. On the other hand, additive manufacturing often suffers of relatively low production rates. Anyhow, additive manufacturing technologies is being given outstanding attention. In particular, metal additive manufacturing emerges as of great significance in industries like aerospace, automotive and tooling. The trend progresses toward full production of high value finished products.
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Mathieu Terner 대한용접접합학회 2019 대한용접·접합학회지 Vol.37 No.4
Additive Manufacturing technologies have been acknowledged for years as tremendous processing routes for the production of parts with complex shape. While the economic Digital Light Processing (DLP) technology was initially restricted to the production of photopolymer materials, it has a great potential for the manufacture of ceramic and metallic parts, half way between direct prototyping and the conventional powder processing route. The method consists in preparing a powder-loaded photopolymer slurry by conventional ball milling, processing green composite parts by DLP and carrying a debinding and sintering heat treatment. The present report investigates the preparation of a suitable slurry and evaluate the printability by DLP. It was found that viscosity of the slurry significantly increased with increasing powder contents, particularly over 25 vol.%. A 28 vol.% Al2O3 powder containing green composite was successfully processed using a commercial DLP apparatus. However, higher loads of powder are required to allow for appropriate sintering, which suggests optimization of the slurry by addition of solvents and use of finer powder particles to reduce viscosity and enhance printability.
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The Current State, Outcome and Vision of Additive Manufacturing
Mathieu Terner 대한용접·접합학회 2015 대한용접·접합학회지 Vol.33 No.6
Additive Manufacturing defines the fabrication of objects by successive consolidation of materials, layer by layer, according to a three-dimensional design. The numerous technologies available today were recently standardized into seven categories based on the general method. Each technology has its own set of advantages and limitations. Though it very much depends on the field of application, major assets of additive manufacturing compared to conventional processing routes are the ability to readily offer complexity (in terms of intricate shape and customization) and significant reduction of waste. On the other hand, additive manufacturing often suffers of relatively low production rates. Anyhow, additive manufacturing technologies is being given outstanding attention. In particular, metal additive manufacturing emerges as of great significance in industries like aerospace, automotive and tooling. The trend progresses toward full production of high value finished products.
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Influence of Gas Metal Arc Welding Parameters on the Bead Properties in Automatic Cladding
Mathieu TERNER,Tsend-Ayush BAYARSAIKHAN,Hyun-Uk HONG,Je-Hyun LEE 대한용접·접합학회 2017 대한용접·접합학회지 Vol.35 No.1
Gas Metal Arc Welding is a widely used process in Industry due to its high productivity and potential to automation. The present study investigates the effects of the welding speed, arc voltage, welding current and shielding gas on the bead geometry for a low-carbon steel. The Response Surface Methodology (RSM) is used to choose an experimental design and perform test runs accordingly in order to produce mathematical models predicting the geometry, the hardness and the heat input of the bead as functions of the welding parameters. The direct and interaction effects of the four welding parameters are represented graphically and allow to determine an optimum set of welding parameters.
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Lee, J.W.,Terner, M.,Hong, H.U.,Na, S.H.,Seol, J.B.,Jang, J.H.,Lee, T.-H. Elsevier 2018 Materials characterization Vol.135 No.-
<P><B>Abstract</B></P> <P>The formation of serrated grain boundaries and its mechanism correlated with straining exerted on grain boundaries were investigated in a Ni–20Cr binary model alloy. This model alloy is a full solid-solution which is deliberately free of carbon and aluminum to exclude precipitation of second phase. A special heat treatment involving slow cooling was used to promote grain boundary serration, which is known to enhance creep properties by decreasing interfacial free energy. No sign of serration could be observed for the Ni–20Cr model alloy, as expected. However, we found that a compressive 5% strain hold applied during slow cooling successfully induced grain boundary serration. The compressive 5% strain hold generated dislocations near the grain boundary, which promoted Cr enrichment near and at the grain boundary. To dismiss the effect of dislocations, straining was removed and the solutionizing temperature was increased in order to promote Cr enrichment near and at grain boundaries by means of vacancy-assisted diffusion of Cr atoms from the bulk to grain boundaries during slow cooling. Significant grain boundary serration was again observed. Atom probe tomography analyses showed that the serrated grain boundary with a wide width of ~10nm was enriched with Cr atoms, as much as 87 at.%, while the γ matrix only contained 34 at.%. First-principles calculations showed that the strain energy necessary for the onset of grain boundary serration is lower than 0.97kJ/mol.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Grain boundary serration was first found to occur in Ni–Cr binary alloy with no precipitate. </LI> <LI> The mechanism of segregation-induced serration was proposed. </LI> <LI> The serrated grain boundary was enriched with Cr atoms as high as 87 at.%. </LI> <LI> The critical strain energy for the serration was determined to be lower than 0.97kJ/mol. </LI> </UL> </P> <P><B>Graphical Abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Shin, Kyeong-Yong,Kim, Jin-Hyeok,Terner, Mathieu,Kong, Byeong-Ook,Hong, Hyun-Uk Elsevier 2019 Materials science & engineering. properties, micro Vol.751 No.-
<P><B>Abstract</B></P> <P>The effects of heat treatment conditions on the microstructure and the deformation behavior of Haynes 282 superalloy in tension at 750 °C were investigated. The standard 2-step aging heat treatment (1010 °C/2 h + 788 °C/8 h) was compared to alternative, more economical, 1-step aging treatment (800 °C/4 h). Moreover, three different cooling rates from the solution temperature of 1135 °C were studied to represent the effective cooling rates that large-scale components may experience. Regardless of the heat treatment conditions, as much as about 20% of fine spherical intragranular γ' particles were successfully precipitated with an average size between 12 nm and 39 nm. The average γ' particles size increased as the cooling rate from the solution temperature decreased. All four heat-treated alloys exhibited good mechanical properties at the high temperature of 750 °C with a yield strength in particular well over 620 MPa. As it could be expected, the yield strength increased and the ductility decreased as the average γ' particles size decreased. The alloys exhibited a mixed mode of deformation characterized by shearing and bypassing. However, the dominant deformation mechanism depended on the γ' characteristics resulting from different heat treatment conditions: only 1-step aged specimens with the largest γ' particles of 39 nm size, which was furnace-cooled from solution temperature, exhibited a plastic behavior typical of a dislocations shearing mechanism while the other alloys showed primarily an Orowan dislocations bowing and looping mechanism behavior. The major operative deformation mechanism could be well predicted by strength increment calculations based on the precipitation strengthening model. Our results suggest that wrought Haynes 282 produced by a more economical 1-step aging treatment may be a reliable candidate for high temperature applications under advanced ultra-super-critical (A-USC) conditions.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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