The machinability of cast titanium and Ti-6Al-4V.
This study investigated the machinability (ease of metal removal) of commercially pure (CP) titanium and Ti-6Al-4V alloy. Both CP Ti and Ti-6Al-4V were cast into magnesia molds. Two types of specimens (with alpha-case and without alpha-case) were made for CP Ti and Ti-6Al-4V. Machinability (n = 5) was evaluated as volume loss (mm3) by cutting/grinding the 3.0 mm surface using fissure burs and silicon carbide (SiC) under two machining conditions: (1) two machining forces (100 or 300 gf) at two rotational speeds (15000 or 30000 rpm) for 1 min, and (2) constant machining force of 100 gf and rotational speed of 15000 rpm for 1, 2, 5, 10, and 30 min. As controls, conventionally cast Co-Cr and Type IV gold alloys were evaluated in the same manner as the titanium. When fissure burs were used, there was a significant difference in the machinability between CP titanium with alpha-case and without alpha-case. On the other hand, there was no appreciable difference in the amount of metal removed for each tested metal when using the SiC points.
Ohkubo
C
C
Department of Removable Prosthodontics, Tsurumi University School of Dental Medicine, Yokohama, Japan.
Watanabe
I
I
Ford
J P
JP
Nakajima
H
H
Hosoi
T
T
Okabe
T
T
D000497:Alloys / Q000737:chemistry*; D002858:Chromium Alloys / Q000737:chemistry; D019245:Compressive Strength; D006047:Gold Alloys / Q000737:chemistry; D006245:Hardness Tests; D008855:Microscopy, Electron, Scanning; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
D000497:Alloys; D002858:Chromium Alloys; D006047:Gold Alloys; C031462:titanium alloy (TiAl6V4); D014025:Titanium