Excimer laser processing of tool steel: Tribological effects of multiple pulse processing and titanium alloying

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Excimer lasers were used to modify the surface of AISI type A-7 tool steel, a high C, high V, high Cr material used in many cutting applications. Multiple pulses of laser radiation at 248 nm were used to alter the composition of the surface alloy. Hardness and modulus were not significantly affected by the treatment, but friction in dry sliding against an alumina pin was reduced. The reduction was small but persistent for multiply melted and resolidified surfaces. These surfaces showed a marked increase in the surface Cr concentration. Greater reductions in friction were obtained from a Ti rich surface ... continued below

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6 p.

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Jervis, T.R.; Nastasi, M.; Griffin, A.J. Jr.; Zocco, T.G.; Taylor, T.N. & Foltyn, S.R. December 1, 1995.

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Description

Excimer lasers were used to modify the surface of AISI type A-7 tool steel, a high C, high V, high Cr material used in many cutting applications. Multiple pulses of laser radiation at 248 nm were used to alter the composition of the surface alloy. Hardness and modulus were not significantly affected by the treatment, but friction in dry sliding against an alumina pin was reduced. The reduction was small but persistent for multiply melted and resolidified surfaces. These surfaces showed a marked increase in the surface Cr concentration. Greater reductions in friction were obtained from a Ti rich surface layer formed by laser mixing an evaporated Ti layer into the material. The friction coefficient of the Ti alloyed surface deteriorated after approximately 1000 cycles, indicating wear=through of the modified surface. The observed properties will be discussed in terms of the excimer laser modification process and the microstructure and composition of the resulting surfaces.

Physical Description

6 p.

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OSTI as DE96003143

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  • Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 27 Nov - 1 Dec 1995

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  • Other: DE96003143
  • Report No.: LA-UR--95-3850
  • Report No.: CONF-951155--12
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 204202
  • Archival Resource Key: ark:/67531/metadc670082

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  • December 1, 1995

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  • June 29, 2015, 9:42 p.m.

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  • Feb. 25, 2016, 4:30 p.m.

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Jervis, T.R.; Nastasi, M.; Griffin, A.J. Jr.; Zocco, T.G.; Taylor, T.N. & Foltyn, S.R. Excimer laser processing of tool steel: Tribological effects of multiple pulse processing and titanium alloying, article, December 1, 1995; New Mexico. (digital.library.unt.edu/ark:/67531/metadc670082/: accessed June 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.