http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Effect of Plastic Working on Fatigue Properties of Ti-6Al-4V Alloy with Notch
Hattori, Nobusuke,Nishida, Shinichi,Hara, Masahiro,Son, Sun Young Trans Tech Publications, Ltd. 2005 Key Engineering Materials Vol.297 No.-
<P>This study is focused to the effects of plastic working on the fatigue strength of Ti-6Al-4V alloy with notch. In general, the fatigue strength of plastic worked specimen is higher than that of non-worked one. However, the potential of hardening ability of Ti-6Al-4V alloy is very limited. Accordingly, the effect of work hardening on fatigue strength about this material is very small. In addition, the surface of the worked part becomes rougher with increasing plastic deformed value and the fatigue cracks initiate at this part. Consequently, the fatigue limit of the plastic worked specimen is lower than that of the non-plastic-worked one.</P>
Mechanical properties of tungsten fiber reinforced-Ti-6Al-4V alloy MMCs
Sunyoung SON,Shin-ichi NISHIDA,Nobusuke HATTORI,Young-Suk KIM 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.8
The objective of this study is to establish an optimized manufacturing process of the metal-matrix composite (MMC) made from tungsten fiber reinforced Ti-6Al-4V alloys using a hot isostatic pressing (HIP). The rod type MMC was made by mixing W fibers of W fibers of 20 ㎛ in diameter and 1㎜ long and Ti-6Al-4V powders of of 70 ㎛ in the mean diameter in a V-mill blender, pressing the mixed powders using in argon atmosphere at 950℃ for 1 hr. under applied pressure of 1000㎫, followed by swaging at RT with 70% cold work. The MMC with the tungsten fibers varying from 0 to 12 vol.% were subjected to tensile tests, fatigue tests and hardness measurement ar RT. Comparing to the mechanical properties of conventional Ti-6Al-4V alloy, the rod-type MMC made by HIP had increased hardness with increasing volume percent of W fibers, the peak tensile strength at the 9vol.% W fibers but lower fatigue strengths for all the volume percent of W fibers added. The effect of the W fiber concentration on the mechanical properties of the MMCs was discussed based on the orientation of the W fibers in the matrix, porosity and the secondary cracks which were evaluated by microstructural examination of the MMCs after mechanical tests.