Crystallographic, Microstructural, and Mechanical Characterization of Dynamically Processed EP741NP Superalloy

Sharma, Akash Deep; Sharma, Ankush; Thakur, Nagesh

doi:10.1007/s11663-016-0688-8

Cited by 10 publications

(2 citation statements)

References 32 publications

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“…The ampule is made of mild steel to withstand with shape deformation with a conical top and plane bottom plugs. The plugs are fabricated with annular grooves so that during rapid solidification process the material may flow into those grooves and thus making a single conglomerate [12,13] . An electric detonator is placed on the top center of the explosive loaded assembly which is further connected to a generator capacitor exploder to initiate the detonation reaction.…”

Section: Methodsmentioning

confidence: 99%

“…The particles are joined together via plastic deformations which is in agreement with the theoretical prediction. The interparticle melted regions get re-solidified under high cooling rates of the order of 10 5 K/s thus maintaining the original microstrucutre [17,18] . This behaviour is a clear evidence that micro-structural sub-strenghtening has been achieved in this process with specified conditions.…”

Section: Microstructural Analysismentioning

confidence: 99%

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A Constitutive Modeling and Experimental Effect of Shock Wave on the Microstructural Sub-strengthening of Granular Copper

Sharma¹,

Sharma²,

Thakur

2021

j. of met. mater. res.

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Micro-sized copper powder (99.95%; O≤0.3) has been shock-processed with explosives of high detonation velocities of the order of 7.5km/s to observe the structural and microstructural sub-strengthening. Axisymmetric shock-consolidation technique has been used to obtain conglomerates of granular Cu. The technique involves the cylindrical compaction system wherein the explosive-charge is in direct proximity with the powder whereas the other uses indirect shock pressure with die-plunger geometry. Numeric simulations have been performed on with Eulerian code dynamics. The simulated results show a good agreement with the experimental observation of detonation parameters like detonation velocity, pressure, particle velocity and shock pressure in the reactive media. A pin contactor method has been utilized to calculate the detonation pressure experimentally. Wide angled x-ray diffraction studies reveal that the crystalline structure (FCC) of the shocked specimen matches with the un-shocked specimen. Field emissive scanning electron microscopic examination of the compacted specimens show a good sub-structural strengthening and complement the theoretical considerations. Laser diffraction based particle size analyzer also points towards the reduced particle size of the shock-processed specimen under high detonation velocities. Micro-hardness tests conducted under variable loads of 0.1kg, 0.05kg and 0.025kg force with diamond indenter optical micrographs indicate a high order of micro-hardness of the order of 159Hv. Nitrogen pycnometry used for the density measurement of the compacts shows that a compacted density of the order of 99.3% theoretical mean density has been achieved.

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Section: Methodsmentioning

confidence: 99%

Section: Microstructural Analysismentioning

confidence: 99%