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Microstructure and mechanical proper...

Chu, Jinn P.

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Microstructure and mechanical properties of laser shocked iron-based alloys.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Microstructure and mechanical properties of laser shocked iron-based alloys./
Author:	Chu, Jinn P.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 1992,
Description:	223 p.
Notes:	Source: Dissertations Abstracts International, Volume: 54-06, Section: B.
Contained By:	Dissertations Abstracts International54-06B.
Subject:	Materials science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9236428

Microstructure and mechanical properties of laser shocked iron-based alloys.
Chu, Jinn P.

Microstructure and mechanical properties of laser shocked iron-based alloys. - Ann Arbor : ProQuest Dissertations & Theses, 1992 - 223 p.

Source: Dissertations Abstracts International, Volume: 54-06, Section: B.

Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1992.

This item must not be sold to any third party vendors.

The effects of laser shock processing (LSP) on the microstructure and mechanical properties of the low carbon (0.04 wt.%C) and Hadfield manganese (1%C and 14%Mn) steels have been studied. LSP was performed with a 1.054 $\\mu$m wavelength Nd:phosphate laser operating in a pulse mode (600 ps pulse length and up to 200 J energy) with power densities above 10$\\sp $ W/cm$\\sp2$. Shock waves were generated by volume expansion of the plasma formed when the material was laser irradiated. Maximum shock wave intensities were obtained using an energy-absorbing black paint coating without a plasma-confining overlay. Maximum modification of the material surface properties and favorable compressive residual stresses were achieved when LSP-induced deformation occurred without melting. Mechanical properties of materials such as surface hardness were greatly improved through modifying the microstructure by LSP. High density arrays of dislocations ($>$10$\\sp $/cm$\\sp2$) were generated in low carbon steel by high strain-rate deformation of LSP, resulting in surface hardness increases of 30 to 80%. In austenitic Hadfield steel, LSP caused extensive formation of $\\epsilon$-hcp martensite (35 vol.%), producing increases of 50 to 130% in surface hardness. The LSP strengthening effect in Hadfield steel was attributed to the combined effects of the partial dislocation/stacking fault arrays and the grain refinement due to presence of the $\\epsilon$-hcp martensite. Surface and near surface compressive residual stresses due to plastic deformation by LSP were measured in both steels. Comparisons of LSP microstructure and properties were made with the lower strain rate processes of shot peening and cold rolling for both steels.Subjects--Topical Terms:

543314
Materials science.

Microstructure and mechanical properties of laser shocked iron-based alloys.
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008 201008s1992 ||||||||||||||||| ||eng d
035 $a (MiAaPQ)AAI9236428
035 $a AAI9236428
040 $a MiAaPQ $c MiAaPQ
100 1 $a Chu, Jinn P. $3 3433829
245 1 0 $a Microstructure and mechanical properties of laser shocked iron-based alloys.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1992
300 $a 223 p.
500 $a Source: Dissertations Abstracts International, Volume: 54-06, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Rigsbee, J. Michael.
502 $a Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1992.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a The effects of laser shock processing (LSP) on the microstructure and mechanical properties of the low carbon (0.04 wt.%C) and Hadfield manganese (1%C and 14%Mn) steels have been studied. LSP was performed with a 1.054 $\\mu$m wavelength Nd:phosphate laser operating in a pulse mode (600 ps pulse length and up to 200 J energy) with power densities above 10$\\sp $ W/cm$\\sp2$. Shock waves were generated by volume expansion of the plasma formed when the material was laser irradiated. Maximum shock wave intensities were obtained using an energy-absorbing black paint coating without a plasma-confining overlay. Maximum modification of the material surface properties and favorable compressive residual stresses were achieved when LSP-induced deformation occurred without melting. Mechanical properties of materials such as surface hardness were greatly improved through modifying the microstructure by LSP. High density arrays of dislocations ($>$10$\\sp $/cm$\\sp2$) were generated in low carbon steel by high strain-rate deformation of LSP, resulting in surface hardness increases of 30 to 80%. In austenitic Hadfield steel, LSP caused extensive formation of $\\epsilon$-hcp martensite (35 vol.%), producing increases of 50 to 130% in surface hardness. The LSP strengthening effect in Hadfield steel was attributed to the combined effects of the partial dislocation/stacking fault arrays and the grain refinement due to presence of the $\\epsilon$-hcp martensite. Surface and near surface compressive residual stresses due to plastic deformation by LSP were measured in both steels. Comparisons of LSP microstructure and properties were made with the lower strain rate processes of shot peening and cold rolling for both steels.
590 $a School code: 0090.
650 4 $a Materials science. $3 543314
650 4 $a Metallurgy. $3 535414
690 $a 0794
690 $a 0743
710 2 $a University of Illinois at Urbana-Champaign. $3 626646
773 0 $t Dissertations Abstracts International $g 54-06B.
790 $a 0090
791 $a Ph.D.
792 $a 1992
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9236428