Study on Orange Peel Phenomena in Cu-Cr-Zr-Ti Alloy Thrust Chamber

Ravi Ranjan Kumar; Alok Singh; Ashish Kumar Pande; Debasis Tripathy; M. Amruth; Thomas Tharian; P.V. Venkitakrishnan

doi:10.4028/www.scientific.net/MSF.830-831.362

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Microstructure Control and Mechanical Property Correlation in Titanium Alloy Ti-6Al-4V Fasteners for Space Applications
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Study of Microstructure and Wear Behavior of T6 Heat Treated as Cast Al-25Mg₂Si-2Cu Alloy
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Study on Orange Peel Phenomena in Cu-Cr-Zr-Ti Alloy Thrust Chamber
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Thermal Expansion Behaviour of Inconel-690 by In Situ High Temperature X-Ray Diffraction
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Electron Microscopic Study of Nodules Formed during Electrodeposition of Copper on Aluminium
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Effect of Sb, Sn and Pb Additions on the Microstructure and Mechanical Properties of AZ91 Alloy
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Effect of Si on the Microstructure and Mechanical Properties of Mg-2Sb Alloy
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Study on Orange Peel Phenomena in Cu-Cr-Zr-Ti Alloy Thrust Chamber

Abstract:

Cu-Cr-Zr-Ti alloys are widely used for fabrication of thrust chamber in liquid rocket engines, because of their high thermal conductivity and adequate strength. The alloy should be used in peak aged condition to achieve the best combination of strength and conductivity. However, realization of final component involves different stages of forming, intermediate heat treatment and brazing operations, which limit the usage of the alloy in peak aged condition. The formability of material depends on grain size to a large extent. Larger grained metals have better formability, but the roughened surface that results from stretching metal with coarse grain structure results in surface defects like orange peel. Copper alloys on cold working sometimes exhibit a surface pebbling effect termed as ‘orange peel’ or alligator skin’.The plates of this copper alloy, finish hot rolled at 925 to 975°C and annealed at 980±10°C for 10 ±2 min followed by air cooling are subjected to different stages of forming to get the final profile of thrust chamber. During the course of forming of plate for divergent thrust chamber, orange peel defect is observed in areas of higher deformation. Detailed characterization of these formed shells in terms of microstructure, grain size and mechanical property has been carried out to find out the exact cause of this defect. Study revealed that the plate has coarse grain structure, which has resulted in orange peel defect during forming. To overcome this effect, the plates were realized with modifications in finish hot rolling and annealing temperatures, which has shown improvement in grain refinement and mechanical properties. It has suppressed the orange peel defect during forming.