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    Volume 6, Issue 3 (May 2017)

    Special Issue Paper

    Characterization of Thermochemically Surface-Hardened Titanium by Light Optical Microscopy

    (Received 1 June 2016; accepted 15 August 2016)

    Published Online: 26 May 2017

    CODEN: MPCACD

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    Abstract

    Thermochemically treated titanium grades 2 and 5 were investigated by light optical microscopy and hardness indentation. Gaseous oxidation in oxygen and N2O containing atmospheres resulted in a diffusion zone of oxygen in solid solution in titanium with a hardness up to 1000 HV. A surface scale consisting of oxide can be present depending on the treatment conditions. A new type of carbo-oxidation treatment was applied, where carbon and oxygen are simultaneously incorporated into the surface. This resulted in new microstructural features such as a deep zone of mixed interstitial solid solution, i.e., a diffusion zone, and surface regions consisting of a mixed interstitial compound (TiCXO1 − X structure). Carbo-oxidation yields hardness values in excess of 2500 HV in the mixed interstitial compound and values up to 1500 HV in the diffusion zone. Simultaneously, with the surface hardening treatment, core hardening of the material can be obtained.


    Author Information:

    Gammeltoft-Hansen, Niklas
    Technical Univ. of Denmark, Dept. of Mechanical Engineering,

    Munch, Steffen S.
    Technical Univ. of Denmark, Dept. of Mechanical Engineering,

    Jellesen, Morten S.
    Technical Univ. of Denmark, Dept. of Mechanical Engineering,

    Somers, Marcel A. J.
    Technical Univ. of Denmark, Dept. of Mechanical Engineering,

    Christiansen, Thomas L.
    Technical Univ. of Denmark, Dept. of Mechanical Engineering,


    Stock #: MPC20160083

    ISSN:2165-3992

    DOI: 10.1520/MPC20160083

    Author
    Title Characterization of Thermochemically Surface-Hardened Titanium by Light Optical Microscopy
    Symposium ,
    Committee E04