Effects of martensite morphology dynamic torsional behavior in dual phase steels

Kim, K J; Lee, S; Lee, C G

doi:10.1016/S1359-6462(97)00428-4

Title: Effects of martensite morphology dynamic torsional behavior in dual phase steels

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Abstract

In the strategic industrial sectors such as defense, automotive, precision machine, and space aircraft industries, the demand for structural materials which can be used under severe conditions like dynamic loading has been rising. The lower resistance to deformation and fracture under dynamic loading than under quasi-static loading can fatally affect overall fracture toughness of structural materials. Thus, detailed studies should be made to be able to maintain the deformation and fracture resistance through effective and quantitative evaluation on them, so that the materials can be widely applied to various fields. Because fracture toughness can drastically drop under dynamic loading in the structure containing brittle phase of martensites, especially like in the dual phase steels, it is highly required to clarify the mechanism. This can basically explain the martensite formation and its effect, and the deformation and fracture process under dynamic loading in a more microscopic level. The present study attempted to investigate the micromechanism of dynamic deformation and fracture which affects the martensite morphology by varying the heat-treatment conditions in the ferrite+austenite ({alpha}+{gamma}) temperature region. Dynamic torsional tests using a torsional Kolsky bar were conducted on two kinds of ferrite+martensite dual phase steels. These steels do not have the samemore »« less

Authors:

Kim, K J; Lee, S ^[1]; Lee, C G ^[2]

Pohang Univ. of Science and Technology (Korea, Republic of). Center for Advanced Aerospace Materials
Korea Inst. of Machinery and Materials, Changwon (Korea, Republic of). Materials Engineering Dept.

Publication Date:: Thu Dec 18 00:00:00 EST 1997

OSTI Identifier:: 585965

Resource Type:: Journal Article

Journal Name:: Scripta Materialia

Additional Journal Information:: Journal Volume: 38; Journal Issue: 1; Other Information: PBD: 18 Dec 1997

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; DEFORMATION; FRACTURE MECHANICS; MICROSTRUCTURE; STEELS; MARTENSITE; MECHANICAL TESTS

Citation Formats


                    Kim, K J, Lee, S, and Lee, C G. Effects of martensite morphology dynamic torsional behavior in dual phase steels.  United States: N. p., 1997. 
        Web.  doi:10.1016/S1359-6462(97)00428-4.

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                    Kim, K J, Lee, S, & Lee, C G. Effects of martensite morphology dynamic torsional behavior in dual phase steels.  United States.  https://doi.org/10.1016/S1359-6462(97)00428-4

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                    Kim, K J, Lee, S, and Lee, C G. 1997.  
        "Effects of martensite morphology dynamic torsional behavior in dual phase steels".  United States.  https://doi.org/10.1016/S1359-6462(97)00428-4.

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@article{osti_585965,

  title        = {Effects of martensite morphology dynamic torsional behavior in dual phase steels},

  author       = {Kim, K J and Lee, S and Lee, C G},

  abstractNote = {In the strategic industrial sectors such as defense, automotive, precision machine, and space aircraft industries, the demand for structural materials which can be used under severe conditions like dynamic loading has been rising. The lower resistance to deformation and fracture under dynamic loading than under quasi-static loading can fatally affect overall fracture toughness of structural materials. Thus, detailed studies should be made to be able to maintain the deformation and fracture resistance through effective and quantitative evaluation on them, so that the materials can be widely applied to various fields. Because fracture toughness can drastically drop under dynamic loading in the structure containing brittle phase of martensites, especially like in the dual phase steels, it is highly required to clarify the mechanism. This can basically explain the martensite formation and its effect, and the deformation and fracture process under dynamic loading in a more microscopic level. The present study attempted to investigate the micromechanism of dynamic deformation and fracture which affects the martensite morphology by varying the heat-treatment conditions in the ferrite+austenite ({alpha}+{gamma}) temperature region. Dynamic torsional tests using a torsional Kolsky bar were conducted on two kinds of ferrite+martensite dual phase steels. These steels do not have the same martensite morphology, but have a certain volume fraction of about 50%. Detailed investigations were also made on various factors determining the characteristics of dynamic deformation occurring in martensites by observing deformed microstructures and fracture surfaces.},

  doi          = {10.1016/S1359-6462(97)00428-4},

  url          = {https://www.osti.gov/biblio/585965},
  journal      = {Scripta Materialia},
number       = 1,

  volume       = 38,

  place        = {United States},

  year         = {Thu Dec 18 00:00:00 EST 1997},

  month        = {Thu Dec 18 00:00:00 EST 1997}

}

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