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Microstructural Evaluation of Km4 and Sr3 Samples Subjected to Various Heat Treatments

Microstructural Evaluation of Km4 and Sr3 Samples Subjected to Various Heat Treatments


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About the Book

The gamma-gamma microstructures of two advanced powder metallurgy disk alloys, KM4 and SR3, were quantified after a series of heat treatments using transmission electron microscopy and image analysis. Relationships between the heat treatments and the resulting gamma distributions were evaluated. Statistical correlations between the gamma distributions and the reported tensile strengths, creep resistances, and dwell crack growth resistances were separately assessed for each alloy. To avoid the effects of grain size related mechanisms, the grain size of the samples used in the correlations for each alloy were limited to narrow ranges of about 1.5 in ASTM grain size number. In both alloys, yield and tensile strength increased with increasing fraction of medium sized gamma. The strength increased as the size of the medium gamma decreased and the size of the fine gamma increased. Time to 0.2 percent creep in SR3 increased with increasing medium gamma volume fraction, and decreasing fine gamma sizes. However, 0.2 percent creep time was not clearly correlated with the gamma microstructures of KM4 specimens, apparently due to effects of stabilization heat treatments which greatly suppress creep resistance. Dwell fatigue crack growth rate decreased with increasing medium gamma volume fraction, indicating more medium gamma is beneficial. The crack growth rate also decreased with decreasing gamma size, indicating finer gamma is better.Ellis, David and Gabb, Timothy and Garg, AnitaGlenn Research CenterMICROSTRUCTURE; EVALUATION; HEAT TREATMENT; TEMPERATURE EFFECTS; CREEP PROPERTIES; CRACK PROPAGATION; CORRELATION; GAMMA RAYS; TRANSMISSION ELECTRON MICROSCOPY; YIELD STRENGTH; STATISTICAL CORRELATION; IMAGE ANALYSIS; CREEP STRENGTH; DWELL


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Product Details
  • ISBN-13: 9781720625315
  • Publisher: Createspace Independent Publishing Platform
  • Publisher Imprint: Createspace Independent Publishing Platform
  • Height: 279 mm
  • No of Pages: 92
  • Spine Width: 5 mm
  • Width: 216 mm
  • ISBN-10: 172062531X
  • Publisher Date: 01 Jun 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 236 gr


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Microstructural Evaluation of Km4 and Sr3 Samples Subjected to Various Heat Treatments
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