Haynes 242 Alloy for Lares 2 Satellite

The satellite LARES 2 is designed to test dragging of inertial frames, or frame-dragging, predicted by Einstein’s theory of General Relativity, with accuracy of a few parts in a thousand. For this purpose, besides the typical requirements for a space construction, a high density alloy must be used. In this paper are reported the studies performed on a nickel alloy, the Haynes 242, that is considered a possible candidate for manufacturing all the metallic parts of LARES 2 and other passive geodetic satellites. Haynes 242 density and mechanical properties are compliant with the requirements of the mission. Three different casting with the nominal composition of the alloy have been prepared and tested along with a commercial bar of Haynes 242. The results of tensile and hardness tests on several specimens with different aging time are reported, along with the relevant metallographic analysis. Furthermore, a test on the machinability, performed on a screw, which is the most demanding item from the manufacturing point of view, is reported.

[1]  E. C. Pavlis,et al.  Studies on the materials of LARES 2 satellite , 2019, Journal of Geodesy.

[2]  Grzegorz Michalak,et al.  The GFZ GRACE RL06 Monthly Gravity Field Time Series: Processing Details and Quality Assessment , 2019, Remote. Sens..

[3]  Srinivas Bettadpur,et al.  GRACE-FO: The Gravity Recovery and Climate Experiment Follow-On Mission , 2019, Journal of Spacecraft and Rockets.

[4]  D. Pilone,et al.  Study of CuCrZr alloy for the production of a passive satellite , 2019, Procedia Structural Integrity.

[5]  M. V. Phanibhushana,et al.  Hot Deformation Characterization of Haynes-242 , 2018 .

[6]  D. Pilone,et al.  Fracture behaviour of alloys for a new laser ranged satellite , 2018 .

[7]  R. Penrose,et al.  A new laser-ranged satellite for General Relativity and space geodesy: I. An introduction to the LARES2 space experiment , 2017, 1910.13818.

[8]  A. Paolozzi,et al.  The Contribution of LARES to Global Climate Change Studies With Geodetic Satellites , 2015 .

[9]  E. C. Pavlis,et al.  Quality assessment of LARES satellite ranging data: LARES contribution for improving the terrestrial reference frame , 2015, 2015 IEEE Metrology for Aerospace (MetroAeroSpace).

[10]  Claudio Paris,et al.  Vibration tests on the preloaded LARES satellite and separation system , 2015 .

[11]  Claudio Paris,et al.  LARES: A New Satellite Specifically Designed for Testing General Relativity , 2015 .

[12]  Claudio Paris,et al.  The LARES satellite and its minimization of the thermal forces , 2014, 2014 IEEE Metrology for Aerospace (MetroAeroSpace).

[13]  Grzegorz Michalak,et al.  GFZ RL05: An Improved Time-Series of Monthly GRACE Gravity Field Solutions , 2014 .

[14]  S. Dymek,et al.  Structure-Property Relationship in a Haynes® 242TM Alloy Subjected to Long-Term Exposure at 650°C , 2012 .

[15]  Mahmudur Rahman,et al.  Machining of Nickel Alloy 242 with Cubic Boron Nitride Tools , 2010 .

[16]  Ignazio Ciufolini,et al.  Dragging of inertial frames , 2007, Nature.

[17]  S. Dymek,et al.  Influence of plastic deformation and prolonged ageing time on microstructure of a Haynes 242 alloy , 2006, Journal of microscopy.

[18]  M. F. Rothman,et al.  Effect of Cold Work and Aging Upon the Properties of a Ni-Mo-Cr Fastener Alloy , 1991 .

[19]  S. Dymek,et al.  Strain hardening mechanisms in a NiMoCr alloy , 1991 .