Evaluation of influence factors on the microstructure, static and dynamic mechanical properties of injection molded Ti-6Al-4V based compacts by multiple addition of Mo and B Elements

研究成果: ジャーナルへの寄稿記事

抄録

Although the injection molded Ti alloys show sufficient tensile strength, their fatigue strength was significantly lower than that of wrought material. In this study, the effect of both additions of molybdenum and boron in the Ti-6Al-4V compacts on the microstructural refinement and strength was evaluated. The 4Mo-0.4B added compacts showed fine microstructure and resulted in high tensile strength. However, their fatigue strength was not improved. The degree of influence of oxygen content, relative density and grain size on the tensile strength was estimated, and the main factor of improving tensile strength was the grain refinement. Also, the cause that fatigue strength was not improved was the ratio of the maximum pore diameter to the grain diameter increased due to the microstructural refinement, so that the crack initiated from large pore.

元の言語英語
ページ(範囲)145-153
ページ数9
ジャーナルFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
65
発行部数3
DOI
出版物ステータス出版済み - 1 1 2018

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Tensile strength
Mechanical properties
Microstructure
Boron
Molybdenum
Grain refinement
Oxygen
Cracks
Fatigue strength

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

これを引用

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abstract = "Although the injection molded Ti alloys show sufficient tensile strength, their fatigue strength was significantly lower than that of wrought material. In this study, the effect of both additions of molybdenum and boron in the Ti-6Al-4V compacts on the microstructural refinement and strength was evaluated. The 4Mo-0.4B added compacts showed fine microstructure and resulted in high tensile strength. However, their fatigue strength was not improved. The degree of influence of oxygen content, relative density and grain size on the tensile strength was estimated, and the main factor of improving tensile strength was the grain refinement. Also, the cause that fatigue strength was not improved was the ratio of the maximum pore diameter to the grain diameter increased due to the microstructural refinement, so that the crack initiated from large pore.",
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AU - Miura, Hideshi

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AB - Although the injection molded Ti alloys show sufficient tensile strength, their fatigue strength was significantly lower than that of wrought material. In this study, the effect of both additions of molybdenum and boron in the Ti-6Al-4V compacts on the microstructural refinement and strength was evaluated. The 4Mo-0.4B added compacts showed fine microstructure and resulted in high tensile strength. However, their fatigue strength was not improved. The degree of influence of oxygen content, relative density and grain size on the tensile strength was estimated, and the main factor of improving tensile strength was the grain refinement. Also, the cause that fatigue strength was not improved was the ratio of the maximum pore diameter to the grain diameter increased due to the microstructural refinement, so that the crack initiated from large pore.

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