METALLOGRAPHIC EXAMINATION OF HIGH VELOCITY HEAT EXCHANGER (SHE NO.1)

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Judging from the condition of the tube walls, this heat exchanger was close to failure. The depth of intergranular attack on the inner NaK surface (0.003 in.) and the depth of subsurface voids on the fuel side (0.007 in.) were more than half the wall thickness and these measurements were only from a few scattered specimens and on one plane per specimen. The grain size was much larger in the hot end than in the cold end of the heat exchanger. This increased grain size in the hot end could be attributed to the absence of precipitate and greater triaxial ... continued below

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Pages: 14

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Gray, R J May 24, 1956.

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Description

Judging from the condition of the tube walls, this heat exchanger was close to failure. The depth of intergranular attack on the inner NaK surface (0.003 in.) and the depth of subsurface voids on the fuel side (0.007 in.) were more than half the wall thickness and these measurements were only from a few scattered specimens and on one plane per specimen. The grain size was much larger in the hot end than in the cold end of the heat exchanger. This increased grain size in the hot end could be attributed to the absence of precipitate and greater triaxial stresses due to thermal expansion and a thermal differential across the tube wall. Also, the strain anneal effect due to the thermal cycling during operation at a specific temperature would accelerate grain growth. These stress conditions and the resulting change in microstructures are directly related to the operating temperature at the hot end. The greater depth of corrosion at the hot end could also be due to a greater stressed condition or a corrosion fatigue. Mass transfer was present where the NaK entered the heat exchanger, but this deposition was influenced greatly by flow against the tube walls. The maximum deposit was 0.003 in (auth)

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Pages: 14

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NTIS

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  • Other Information: Decl. Oct. 9, 1959. Orig. Receipt Date: 31-DEC-60

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  • Report No.: CF-56-5-148
  • Grant Number: None
  • DOI: 10.2172/4207445 | External Link
  • Office of Scientific & Technical Information Report Number: 4207445
  • Archival Resource Key: ark:/67531/metadc1026270

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • May 24, 1956

Added to The UNT Digital Library

  • Oct. 15, 2017, 10:09 p.m.

Description Last Updated

  • Oct. 20, 2017, 6:06 p.m.

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Gray, R J. METALLOGRAPHIC EXAMINATION OF HIGH VELOCITY HEAT EXCHANGER (SHE NO.1), report, May 24, 1956; Oak Ridge, Tennessee. (digital.library.unt.edu/ark:/67531/metadc1026270/: accessed June 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.