FORMATION OF TITANIUM-OXYGEN ALPHA CASE SOLID SOLUTION LAYER WITH TEMPERATURE AND TIME VARIATION

• Main Author: Matthew Manurung, Kevin
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/68493
• Institution: Institut Teknologi Bandung

Titanium is the fourth most abundant structural metal with enhanced properties such as specific strength and corrosion resistance. Titanium could not be hardened by strain hardening mechanism, hence it need other hardening mechanism such as interstitial solid solution hardening. Solid solution hardening could be utilized by interstitial atom, such as oxygen, nitrogen, carbon, and boron by heat treatment. The work describes solid solution hardening mechanism by heat treatment to form Ti-O solid solution layer alpha case, as well as the methods to increase titanium hardness by heat treatment in beta phase. The material used is Pure Titanium Grade 3 is received in plate form and heat threated in atmospheric pressure in alpha and beta temperature range. Hardness test is used to determine mechanical properties after thermal oxidation method. The mechanism of oxygen transport in alpha and beta phase field will be described. Heat treatment in beta phase will increase the hardness on Ti-O solid solution layer and increase the thickness of solid solution layer up to 474 micrometers on 1100oC, and also increases the hardness in titanium surface to 1097 HV 0.05.