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  • Other Sources  (7)
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  • 1
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    The design of an Fe-12Mn-O.2Ti alloy steel for low temperature use (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An investigation was made to improve the low temperature mechanical properties of Fe-8 approximately 12% Mn-O 2Ti alloy steels. A two-phase(alpha + gamma) tempering in combination with cold working or hot working was identified as an effective treatment. A potential application as a Ni-free cryogenic steel was shown for this alloy. It was also shown that an Fe-8Mn steel could be grain-refined by a purely thermal treatment because of its dislocated martensitic structure and absence of epsilon phase. A significant reduction of the ductile-brittle transition temperature was obtained in this alloy. The nature and origin of brittle fracture in Fe-Mn alloys were also investigated. Two embrittling regions were found in a cooling curve of an Fe-12Mn-O 2Ti steel which was shown to be responsible for intergranular fracture. Auger electron spectroscopy identified no segregation during solution-annealing treatment. Avoiding the embrittling zones by controlled cooling led to a high cryogenic toughness in a solution-annealed condition.
    Keywords: METALLIC MATERIALS
    Type: NASA-CR-135310
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    The improvement of cryogenic mechanical properties of Fe-12 Mn and Fe-8 Mn alloy steels through thermal/mechanical treatments (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: An investigation has been made to improve the low temperature mechanical properties of Fe-8Mn and Fe-12Mn-0.2 Ti alloy steels. A reversion annealing heat treatment in the two-phase (alpha + gamma) region following cold working has been identified as an effective treatment. In an Fe-12Mn-0.2Ti alloy a promising combination of low temperature (-196 C) fracture toughness and yield strength was obtained by this method. The improvement of properties was attributed to the refinement of grain size and to the introduction of a uniform distribution of retained austenite (gamma). It was also shown that an Fe-8Mn steel could be grain-refined by a purely thermal treatment because of its dislocated alpha-prime martensitic structure and absence of epsilon martensite. As a result, a significant reduction of ductile to brittle transition temperature was obtained.
    Keywords: METALLIC MATERIALS
    Type: Metallurgical Transactions A - Physical Metallurgy and Materials Science; 10A; May 1979
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Unknown
    Tough cryogenic alloys from the Fe-Mn and Fe-Mn-Cr systems (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: By adjusting composition, metastable gamma (austenite) and epsilon (hexagonal) martensite may be retained in Fe-Mn and Fe-Mn-Cr alloys and used to impact toughness through the TRIP mechanism. The resulting alloys have excellent toughness at cryogenic temperatures. The best alloys obtained to date are: Fe-20Mn, with sigma (sub y) = 79ksi and K sub IC = 275ksi square root of (in) at 77 K, and Fc-16Mn-8Cr, with sigma sub y = 85ksi and K sub IC = 72ksi square root of (in) at 77 K.
    Keywords: METALLIC MATERIALS
    Type: NASA-CR-134688
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Narrative end item report on Saturn S-4B-503 /DAC S/N 1007/ (1967)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Manufacturing and test data summary for Saturn S-4B flight stage
    Keywords: SPACE VEHICLES
    Type: NASA-CR-112373 , DAC-56505
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Cryogenic mechanical properties of low density superplastically formable Al-Li alloys (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The aerospace industry is considering the use of low density, superplastically formable (SPF) materials, such as Al-Li alloys in cryogenic tankage. SPF modifications of alloys 8090, 2090, and 2090+In were tested for strength and Kahn tear toughness. The results were compared to those of similar tests of 2219-T87, an alloy currently used in cryogenic tankage, and 2090-T81, a recently studied Al-Li alloy with exceptional cryogenic properties (1-9). With decreasing temperature, all materials showed an increase in strength, while most materials showed an increase in elongation and decrease in Kahn toughness. The indium addition to 2090 increased alloy strength, but did not improve the strength-toughness combination. The fracture mode was predominantly intergranular along small, recrystallized grains, with some transgranular fracture, some ductile rupture, and some delamination on large, unrecrystallized grains.
    Keywords: METALLIC MATERIALS
    Type: International Aluminum-Lithium Conference; Mar 27, 1989 - Mar 31, 1989; Williamsburg, VA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Unknown
    Nickel-free Fe-12Mn-0.2Ti alloy steel for cryogenic applications (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A nickel-free Fe-12Mn-0.2Ti alloy steel was investigated for cryogenic applications. The systematic control of the grain size and the microstructural distribution of the retained gamma phase was made through alpha plus gamma heat treatments in combination with mechanical working. Substantial improvements of important low temperature mechanical properties were obtained by these processings.
    Keywords: METALLIC MATERIALS
    Type: International Conference on the Strength of Metals and Alloys; Aug 30, 1976 - Sep 03, 1976; Nancy; France
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    The suppression of low-temperature intergranular brittleness in ferritic Fe-Mn alloys (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A method for obtaining cryogenic toughness in an Fe-12Mn-0.2Ti alloy by a controlled cooling technique is presented. The intergranular fracture surface of the quenched alloy, using an AES, revealed no significant difference from that obtained by the bulk transgranular fracture surface, indicating the absence of large-scale grain boundary segregation during the austenitizing treatment. Attention is given to the step cooling method, using a furnace at temperatures of 100 to 120 C, followed by fast cooling to ambient temperature, which in turn produces a high-impact toughness without intergranular brittleness. It is concluded that the sources of brittle intergranular fracture in the alloy are both chemical, operating in martensitic structure, and nonchemical, active during quenching from the austenitizing treatment.
    Keywords: METALLIC MATERIALS
    Type: Advances in cryogenic engineering. Volume 24 - Second International Cryogenic Materials Conference; Aug 02, 1977 - Aug 05, 1977; Boulder, CO
    Format: text
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    NASA TECHNICAL REPORTS
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