Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Oxidation Effects on Short-Term Creep Response in Air of Commercially Pure Titanium (CP-2 Ti)

Version 1 : Received: 7 June 2023 / Approved: 8 June 2023 / Online: 8 June 2023 (10:18:37 CEST)

A peer-reviewed article of this Preprint also exists.

Regev, M.; Santoni, A.; Spigarelli, S. Oxidation Effects on Short-Term Creep Response in Air of Commercially Pure Titanium (CP-2 Ti). Metals 2023, 13, 1275. Regev, M.; Santoni, A.; Spigarelli, S. Oxidation Effects on Short-Term Creep Response in Air of Commercially Pure Titanium (CP-2 Ti). Metals 2023, 13, 1275.

Abstract

The creep response of commercially pure titanium was investigated in air at 550, 600 and 650°C, to assess the effect of oxidation on the mechanical response. Experiments demonstrated that exposure at high temperature produced a marked reduction of the minimum creep rate under a given applied stress. Microhardness measurements showed that a hardened zone forms in proximity of the surface, due to oxygen penetration into metal. A simplified composite-model was then used to describe the creep response. In this model, the sample consisted of two zones, the hard case, enriched in oxygen, and the soft pure-titanium core, both creeping with similar strain rates. Calculation led to an estimation of the dependence of the minimum creep rate on stress and temperature for the hard high-oxygen zone. The simplified composite-model here presented gave an excellent description of experimental creep data for pure titanium tested in air and also provided a reliable picture of the effect of oxidation on complex Ti-alloys.

Keywords

creep; oxidation; titanium; constitutive equations

Subject

Chemistry and Materials Science, Metals, Alloys and Metallurgy

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