NDLI: Microstructure and mechanical properties of quenched and tempered 300m steel

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Microstructure and mechanical properties of quenched and tempered 300m steel

Content Provider	NASA Technical Reports Server (NTRS)
Author	Raghavan, M. Youngblood, J. L.
Copyright Year	1978
Description	Type 300M steel, which is being used for the landing gear on the space shuttle orbiter, was subjected to a wide range of quenched and tempered heat treatments. The plane-strain fracture toughness and the tensile ultimate and yield strengths were evaluated. Cryogenic mechanical properties were obtained for conventionally heat-treated steel. The microstructure of all heat-treated test coupons was studied both optically and by transmission electron microscopy. Fracture surfaces were studied by means of scanning electron microscopy. Results indicate that substantial improvement in toughness with no loss in strength can be accomplished in quenched and tempered steel by austenitizing at 1255 K or higher. Low fracture toughness in conventionally austenitized 300M steel (1144 K) appears to be caused by undissolved precipitates, seen both in the submicrostructure and on the fracture surface, which promote failure by quasi-cleavage. The precipitates appeared to dissolve in the range 1200 to 1255 K.
File Size	22570417
Page Count	42
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19780022667
Archival Resource Key	ark:/13960/t06x45607
Language	English
Publisher Date	1978-08-01
Access Restriction	Open
Subject Keyword	Structural Mechanics Quenching Cooling Scanning Electron Microscopy Heat Treatment Photomicrographs Mechanical Properties Precipitates Space Shuttle Orbiters Transmission Electron Microscopy High Strength Steels Austenitic Stainless Steels Landing Gear Yield Strength Fracture Strength Microstructure Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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