AFRC_CATP_05979 - Understanding the Oxygen and Hydrogen pick-up in dual phase titanium alloys during gas furnace heat treatments – Experimental and Micro-hardness based modelling

  • Andreu, Aurik (Principal Investigator)
  • Sivaswamy, Giribaskar (Co-investigator)
  • Souza, Paul (Co-investigator)

Project: Research

Project Details

Description

Titanium alloys exhibits high affinity to hydrogen and oxygen gases when exposed to high temperatures. Gas fired furnaces are mainly used for industrial applications due to the cost effective and established processing methods. Dual phase titanium alloys are more susceptible for gases entrapment during gas fired furnace treatments. Various methods such as furnace atmosphere control, workpiece coating and increased machining allowances are considered to minimise the effect of gases entrapment in dual phase titanium alloys. Significant research has been carried out to understand the kinetics of gases in titanium alloys. However, predicting the gases entrapment within work piece is a challenge due to the change in nature of gases zones such as thick oxide/hydride layer and oxygen/hydrogen diffusion layer. Recent developments in advanced characterization and modelling techniques allow to understand the gases entrapment as a function of variation in hardness from surface to the core of the workpiece. Further, an understanding of the gases entrapment among various phases in Titanium alloy need substantial development. The difficulty in measuring the hydrogen gas content within the microstructural constituents can be addressed using micro hardness based methods.
The present work will demonstrate the feasibility of cost reduction in industrial processing of titanium alloys by generating capability to choose operating conditions (furnace and atmosphere) to achieve net zero by minimizing the material and energy losses. The oxygen and hydrogen diffusion during various gas furnace heat treatments of Ti64 alloy will be studied. Oxygen profile analysis will be carried out using advanced characterization techniques (SEM based). The possibilities for studying the hydrogen profile in Ti64 alloy will be explored. Detailed micro hardness area mapping extending from alpha case to oxygen diffusion layer will be carried out. The relationship between the gases content and micro hardness profile will be analysed and a suitable micro hardness profile modelling will be carried out. This work will mainly on the basis of empirical parabolic relationship that exits among micro hardness and gases concentration / diffusion in an oxidized titanium alloy.
Short titleAFRC_CATP_05979
StatusFinished
Effective start/end date1/05/2228/02/23

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