Heat Treatment Procedure Qualification for Steel Castings

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Heat treatment practices used by steel foundries have been carefully studied as part of comprehensive heat treatment procedure qualification development trials. These studies highlight the relationships between critical heat treatment process control parameters and heat treatment success. Foundry heat treatment trials to develop heat treatment procedure qualifications have shed light on the relationship between heat treatment theory and current practices. Furnace load time-temperature profiles in steel foundries exhibit significant differences depending on heat treatment equipment, furnace loading practice, and furnace maintenance. Time-temperature profiles of furnace control thermocouples can be very different from the time-temperature profiles observed at the center of ... continued below

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3068 KB pages

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Charles, Mariol; Deskevich, Nicholas; Varkey, Vipin; Voigt, Robert & Wollenburg, Angela April 29, 2004.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 40 times . More information about this report can be viewed below.

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  • Pennsylvania State University
    Publisher Info: Pennsylvania State University (United States)
    Place of Publication: [University Park, Pennsylvania]

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Description

Heat treatment practices used by steel foundries have been carefully studied as part of comprehensive heat treatment procedure qualification development trials. These studies highlight the relationships between critical heat treatment process control parameters and heat treatment success. Foundry heat treatment trials to develop heat treatment procedure qualifications have shed light on the relationship between heat treatment theory and current practices. Furnace load time-temperature profiles in steel foundries exhibit significant differences depending on heat treatment equipment, furnace loading practice, and furnace maintenance. Time-temperature profiles of furnace control thermocouples can be very different from the time-temperature profiles observed at the center of casting loads in the furnace. Typical austenitization temperatures and holding times used by steel foundries far exceed what is required for transformation to austenite. Quenching and hardenability concepts were also investigated. Heat treatment procedure qualification (HTPQ) schema to demonstrate heat treatment success and to pre-qualify other alloys and section sizes requiring lesser hardenability have been developed. Tempering success is dependent on both tempering time and temperature. As such, furnace temperature uniformity and control of furnace loading during tempering is critical to obtain the desired mechanical properties. The ramp-up time in the furnace prior to the establishment of steady state heat treatment conditions contributes to the extent of heat treatment performed. This influence of ramp-up to temperature during tempering has been quantified.

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3068 KB pages

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OSTI as DE00840826

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  • Other Information: PBD: 29 Apr 2004

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  • Report No.: NONE
  • Grant Number: FC07-99ID13841
  • DOI: 10.2172/840826 | External Link
  • Office of Scientific & Technical Information Report Number: 840826
  • Archival Resource Key: ark:/67531/metadc780868

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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

  • April 29, 2004

Added to The UNT Digital Library

  • Dec. 3, 2015, 9:30 a.m.

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  • Feb. 20, 2017, 1:27 p.m.

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Charles, Mariol; Deskevich, Nicholas; Varkey, Vipin; Voigt, Robert & Wollenburg, Angela. Heat Treatment Procedure Qualification for Steel Castings, report, April 29, 2004; [University Park, Pennsylvania]. (digital.library.unt.edu/ark:/67531/metadc780868/: accessed December 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.