Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781722947989
Category :
Languages : en
Pages : 118
Book Description
The objective was to apply powder metallurgy techniques for the production of improved bearing elements, specifically balls and races, for advanced cryogenic turbopump bearings. The materials and fabrication techniques evaluated were judged on the basis of their ability to improve fatigue life, wear resistance, and corrosion resistance of Space Shuttle Main Engine (SSME) propellant bearings over the currently used 440C. An extensive list of candidate bearing alloys in five different categories was considered: tool/die steels, through hardened stainless steels, cobalt-base alloys, and gear steels. Testing of alloys for final consideration included hardness, rolling contact fatigue, cross cylinder wear, elevated temperature wear, room and cryogenic fracture toughness, stress corrosion cracking, and five-ball (rolling-sliding element) testing. Results of the program indicated two alloys that showed promise for improved bearing elements. These alloys were MRC-2001 and X-405. 57mm bearings were fabricated from the MRC-2001 alloy for further actual hardware rig testing by NASA-MSFC. Moracz, D. J. and Shipley, R. J. and Moxson, V. S. and Killman, R. J. and Munson, H. E. Unspecified Center BALL BEARINGS; BEARING ALLOYS; FABRICATION; POWDER METALLURGY; SPACE SHUTTLE MAIN ENGINE; TURBINE PUMPS; CORROSION RESISTANCE; FATIGUE LIFE; FRACTURE STRENGTH; STRESS CORROSION CRACKING; WEAR RESISTANCE...
Author: 
Author: 
Author: 
Author: 
Author: S. F. Morea
Author: Peter L. Conley
Author: 
Author: United States. National Aeronautics and Space Administration
Author: