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  Effect of phosphorous and boron addition on microstructural evolution and Charpy impact properties of high-phosphorous-containing plain carbon steels

Hong, S., Shin, S. Y., Lee, J., Lee, C.-H., & Lee, S. (2013). Effect of phosphorous and boron addition on microstructural evolution and Charpy impact properties of high-phosphorous-containing plain carbon steels. Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing, 564, 461-472. doi:10.1016/j.msea.2012.11.102.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-E3C7-E Version Permalink: http://hdl.handle.net/21.11116/0000-0001-E3C8-D
Genre: Journal Article

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 Creators:
Hong, Seokmin1, Author              
Shin, Sang Yong2, Author              
Lee, Junghoon1, Author              
Lee, Chang-Hoon3, Author              
Lee, Sunghak4, Author              
Affiliations:
1Center for Advanced Aerospace Materials, Pohang University of Science and Technology, Pohang 790-784, South Korea, persistent22              
2Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              
3Next Generation Products Research Group, Technical Research Laboratories, POSCO, Pohang 790-785, South Korea, persistent22              
4Center for Advanced Aerospace MaterialsPohang, University of Science and Technology, Pohang, South Korea, persistent22              

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Free keywords: Area fraction; Boron additions; Charpy impact; Charpy impact energy; Coarse grains; Critical time; Grain boundary segregation; Intergranular fracture; Intergranular modes; Isothermal treatment; Non-equilibrium grain boundaries; Plain carbon steels, Bainite; Boron; Carbides; Carbon steel; Ferrite; Fracture; Grain boundaries; Grain refinement; Isotherms; Phosphorus; Textures, Segregation (metallography)
 Abstract: Four plain carbon steels were fabricated by controlling the addition of P and B, and then isothermal heat-treatments were conducted at 550. °C and 650. °C for 3. h on these steels to make ferrite-pearlite-based or ferrite-bainite-based microstructures, respectively. B was added for controlling the reduction in toughness due to grain boundary segregation of P because B was readily distributed on grain boundaries. In the 550. °C-treated steels, bainite grains were refined by the B addition, whereas the 650. °C-treated steels did not show the grain refinement due to the B addition. According to the critical time analysis for non-equilibrium grain boundary segregation of P and B, the present isothermal treatment time of 3. h was too short for the grain boundary segregation of P, and thus the fracture occurred mostly in a cleavage mode, instead of an intergranular mode. Since this 3. h-treatment time was too long for the grain boundary segregation of B, the grain boundary segregation of B was reduced, and the precipitation of cementites was promoted. In the 550. °C-treated steels, the area fraction of intergranular fracture increased with increasing volume fraction of grain boundary cementites, as they played an important role in initiating the intergranular fracture, although the area fraction of intergranular fracture was lower than 5. In the 650. °C-treated steels having coarse grains, however, grain boundary cementites did not work for intergranular fracture because the crack readily propagated in a cleavage mode. © 2012 Elsevier B.V.

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Language(s): eng - English
 Dates: 2013-03-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.msea.2012.11.102
BibTex Citekey: Hong2013461
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Title: Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing
  Abbreviation : Mater. Sci. Eng. A: Struct. Mater. Prop. Microstruct. Process.
Source Genre: Journal
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Publ. Info: New York, NY : Elsevier
Pages: - Volume / Issue: 564 Sequence Number: - Start / End Page: 461 - 472 Identifier: ISSN: 0921-5093
CoNE: /journals/resource/954928498465_1