Microstructure Control of High Nitrogen Alpha + Beta Type Titanium Alloy

Tomohiro Ando; Koichi Nakashima; Toshihiro Tsuchiyama; Setsuo Takaki

doi:10.4028/www.scientific.net/KEM.345-346.193

Paper Titles

Study of the Titanium Alloy Deformation Behavior in Equal Channel Angular Extrusion
p.177

Approximation of Thermal Deformation Behaviour of a Machine Tool to Improve its Process Precision
p.181

Effect of Peel Rate on Interfacial Strength
p.185

Work Hardening Behavior of Low Carbon Martensitic Steel
p.189

Microstructure Control of High Nitrogen Alpha + Beta Type Titanium Alloy
p.193

New Insights into Plasticity-Induced Crack Tip Shielding via Mathematical Modelling and Full Field Photoelasticity
p.199

Multiaxial Fatigue--A Perspective
p.205

Analysis of Biaxial Fatigue Crack Growth in Microstructure Modeled by Voronoi-Polygon
p.211

Variability in Fatigue Behavior of a Zr-Based Bulk Metallic Glass (BMG) as a Result of Average Surface Roughness and Pronounced Surface Defects
p.217

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Microstructure Control of High Nitrogen Alpha + Beta Type Titanium Alloy

Abstract:

Solution nitriding and aging treatment were applied to Ti-4mass%Cr alloy in order to fabricate a ductile high-nitrogen titanium alloy with fine (α + β) structure. The solution-nitrided specimen withα’ martensitic structure was significantly hardened by solid solution strengthening by the absorbed nitrogen. During the aging treatment, fine β grains with a size of 1 microns in thickness precipitated along the martensite-plate boundaries. Although the specimen was softened to some extent after the aging treatment, the hardness is kept much higher than that of the aged Ti-4mass%Cr alloy without solution nitriding. This indicates that the nitrogen is still in solid solution of α phase even after the aging treatment, and contributes to strengthening of the fine-structured Ti-4mass%Cr-N alloy.