Effect of a Heterogeneous Nitrogen Diffusion Phase on Four-Point Bending Fatigue Properties in Commercially Pure Titanium

被引:3
作者
Kikuchi, Shoichi [1 ]
Suzuki, Shiori [2 ,4 ]
Ito, Hideaki [2 ,4 ]
Fujita, Keisuke [3 ,4 ]
Nakazawa, Kenta [1 ]
机构
[1] Shizuoka Univ, Fac Engn, Dept Mech Engn, Hamamatsu, Shizuoka 4328561, Japan
[2] Shizuoka Univ, Grad Sch Integrated Sci & Technol, Hamamatsu, Shizuoka 4328561, Japan
[3] Shizuoka Univ, Grad Sch Sci & Technol, Hamamatsu, Shizuoka 4328561, Japan
[4] Shizuoka Univ, Hamamatsu, Shizuoka, Japan
关键词
fatigue; gas nitriding; spark plasma sintering; fracture mechanics; commercially pure titanium; GRAIN-SIZE DISTRIBUTION; HARMONIC STRUCTURE; TI-6AL-4V ALLOY; CRACK PROPAGATION; STRENGTH; DESIGN; MICROSTRUCTURE; IMPROVEMENT; RESISTANCE; CORROSION;
D O I
10.2320/matertrans.MT-Z2022004
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The purpose of this study is to develop commercially pure (CP) titanium having a higher fatigue strength than titanium alloys developed via heterogeneous nitrogen diffusion. The microstructure of CP titanium having a heterogeneous nitrogen diffusion phase, which was fabricated by consolidating gas-nitrided powders, was characterized, and its fatigue properties were examined. The nitrogen content and hardness of CP titanium compacts having a heterogeneous nitrogen diffusion phase increased with increasing powder gas nitriding temperature and sintering temperature. The fatigue limit and fatigue life of CP titanium compacts increased with increasing sintering temperature and with decreasing powder gas-nitriding temperature. In particular, CP titanium having a heterogeneous nitrogen diffusion phase that is fabricated by high-temperature sintering of powders treated with low-temperature nitriding has a higher fatigue limit than un-nitrided bulk Ti-6Al-4V alloy. The fatigue limit of CP titanium can he controlled by optimizing the powder gas nitriding and sintering temperatures.
引用
收藏
页码:1046 / 1054
页数:9
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