Characterization of Thermochemically Surface-Hardened Titanium by Light Optical Microscopy

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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-oxidtion 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.
Original languageEnglish
JournalMaterials Performance and Characterization
Volume6
Issue number3
Number of pages13
ISSN2165-3992
DOIs
Publication statusPublished - 2017

Keywords

  • Titanium
  • Surface hardening
  • Mixed interstitial compound
  • Mixed interstitial solid solution
  • Oxidation
  • Carbo-oxidation
  • Metallography

Cite this

@article{f0efaf9168c745aba426dcc881849676,
title = "Characterization of Thermochemically Surface-Hardened Titanium by Light Optical Microscopy",
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-oxidtion 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 hardeningtreatment, core hardening of the material can be obtained.",
keywords = "Titanium, Surface hardening, Mixed interstitial compound, Mixed interstitial solid solution, Oxidation, Carbo-oxidation, Metallography",
author = "Niklas Gammeltoft-Hansen and Munch, {Steffen S.} and Jellesen, {Morten Stendahl} and Somers, {Marcel A. J.} and Christiansen, {Thomas Lundin}",
year = "2017",
doi = "10.1520/MPC20160083",
language = "English",
volume = "6",
journal = "Materials Performance and Characterization",
issn = "2165-3992",
publisher = "ASTM International",
number = "3",

}

TY - JOUR

T1 - Characterization of Thermochemically Surface-Hardened Titanium by Light Optical Microscopy

AU - Gammeltoft-Hansen, Niklas

AU - Munch, Steffen S.

AU - Jellesen, Morten Stendahl

AU - Somers, Marcel A. J.

AU - Christiansen, Thomas Lundin

PY - 2017

Y1 - 2017

N2 - 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-oxidtion 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 hardeningtreatment, core hardening of the material can be obtained.

AB - 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-oxidtion 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 hardeningtreatment, core hardening of the material can be obtained.

KW - Titanium

KW - Surface hardening

KW - Mixed interstitial compound

KW - Mixed interstitial solid solution

KW - Oxidation

KW - Carbo-oxidation

KW - Metallography

U2 - 10.1520/MPC20160083

DO - 10.1520/MPC20160083

M3 - Journal article

VL - 6

JO - Materials Performance and Characterization

JF - Materials Performance and Characterization

SN - 2165-3992

IS - 3

ER -