Segregation effects in JBK-75

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Description

Chemical segregation of alloying elements, can be a severe problem in complex alloys. Many problems have been experienced with developing fabrication processes for JBK-75 and it is suggested that these difficulties may be related in part to the degree of chemical heterogeneity that exists in the alloy. Early testing and qualification of the alloy was made on relatively homogeneous samples, which came from small diameter ingots. In large size ingots used for production, it is more difficult to achieve a uniform distribution of alloying elements in the product; resulting in greater variability of alloy properties which are difficult to explain. ... continued below

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Pages: 37

Creation Information

Mataya, M. C.; Edstrom, C. M.; Krenzer, R. W. & Doyle, J. H. December 21, 1979.

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Description

Chemical segregation of alloying elements, can be a severe problem in complex alloys. Many problems have been experienced with developing fabrication processes for JBK-75 and it is suggested that these difficulties may be related in part to the degree of chemical heterogeneity that exists in the alloy. Early testing and qualification of the alloy was made on relatively homogeneous samples, which came from small diameter ingots. In large size ingots used for production, it is more difficult to achieve a uniform distribution of alloying elements in the product; resulting in greater variability of alloy properties which are difficult to explain. Extensive microprobe measurements were made on samples of JBK-75 bar stock from several different production size ingots. It was found that segregation of titanium is a common occurrence. Titanium banding can be controlled by ingot melting rate and homogenization of ingot or intermediate product. A model for titanium diffusion shows that homogenizing at the ingot stage is ineffectual with respect to the spacing measured. However, homogenizing 20.3-cm diameter intermediate product, where band spacing is reduced, will significantly reduce segregation. The effect of segregation on tensile properties is discussed. Segregation may have a significant influence on forgeability of JBK-75. Forgeability tests show that microstructure plays an important role in the ability of JBK-75 to deform homogeneously, and microstructure is controlled by chemical uniformity of the alloy. Inhomogeneous shear during forging can cause adiabatic shear planes to form, and these have been observed in JBK-75.

Physical Description

Pages: 37

Notes

Dep. NTIS, PC A03/MF A01.

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  • Report No.: RFP-2925
  • Grant Number: EY-76-C-04-3533
  • DOI: 10.2172/5620581 | External Link
  • Office of Scientific & Technical Information Report Number: 5620581
  • Archival Resource Key: ark:/67531/metadc1093188

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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

  • December 21, 1979

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

Description Last Updated

  • April 16, 2018, 6:15 p.m.

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Mataya, M. C.; Edstrom, C. M.; Krenzer, R. W. & Doyle, J. H. Segregation effects in JBK-75, report, December 21, 1979; United States. (digital.library.unt.edu/ark:/67531/metadc1093188/: accessed June 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.