Journal Published Online: 28 February 2017
Volume 6, Issue 3

Characterization of Thermochemically Surface-Hardened Titanium by Light Optical Microscopy

CODEN: MPCACD

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, DK
Munch, Steffen
Technical Univ. of Denmark, Dept. of Mechanical Engineering, DK
Jellesen, Morten
Technical Univ. of Denmark, Dept. of Mechanical Engineering, DK
Somers, Marcel
Technical Univ. of Denmark, Dept. of Mechanical Engineering, DK
Christiansen, Thomas
Technical Univ. of Denmark, Dept. of Mechanical Engineering, DK
Pages: 13
Price: $25.00
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Details
Stock #: MPC20160083
ISSN: 2165-3992
DOI: 10.1520/MPC20160083