Open AccessMechanical Strength and Microstructure of Laser-welded Ti-6Al-7Nb Alloy Castings
Author(s) -
Viritpon Srimaneepong,
Takayuki Yoneyama,
Equo Kobayashi,
Hisashi Doi,
Takao Hanawa
Publication year - 2005
Publication title -
dental materials journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.636
H-Index - 56
eISSN - 1881-1361
pISSN - 0287-4547
DOI - 10.4012/dmj.24.541
Subject(s) - materials science , welding , alloy , ultimate tensile strength , metallurgy , brittleness , microstructure , laser beam welding , laser , tensile testing , composite material , physics , optics
Mechanical properties of laser-welded castings of Ti-6Al-7Nb alloy, CP Ti, and Co-Cr alloy were investigated and compared to the unwelded castings using a tensile test. Dumbbell-shaped specimens were cut at the center, and two halves of the specimens were welded with an Nd:YAG laser welding machine at 220 or 260 V of laser voltage. The mechanical strength of 260 V groups was higher than that of 220 V groups for Ti-6Al-7Nb and Co-Cr alloys except for CP Ti. All 260 V laser-welded castings of Ti-6Al-7Nb alloy and CP Ti, which fractured outside the welded joints, exhibited ductile characteristics, while all laser-welded Co-Cr alloy castings, which fractured within the welded joints, showed brittle characteristics. This study proved that the mechanical strength of laser-welded Ti-6Al-7Nb alloy and CP Ti castings was as high as that of unwelded castings, while the mechanical properties of laser-welded alloy joints were influenced by microstructural changes.