TY - JOUR
T1 - Stir zone microstructure of commercial purity titanium friction stir welded using pcBN tool
AU - Zhang, Yu
AU - Sato, Yutaka
AU - Kokawa, Hiroyuki
AU - Park, Seung Hwan C.
AU - Hirano, Satoshi
PY - 2008/8/15
Y1 - 2008/8/15
N2 - In the present study, friction stir welding was applied to commercial purity titanium using a polycrystalline cubic boron nitride tool, and microstructure and hardness in the weld were examined. Additionally, the microstructural evolution during friction stir welding was also discussed. The stir zone consisted of fine equiaxed α grains surrounded by serrate grain boundaries, which were produced through the β → α allotropic transformation during the cooling cycle of friction stir welding. The fine α grains caused higher hardness than that in the base material. A lath-shaped α grain structure containing Ti borides and tool debris was observed in the surface region of the stir zone, whose hardness was the highest in the weld.
AB - In the present study, friction stir welding was applied to commercial purity titanium using a polycrystalline cubic boron nitride tool, and microstructure and hardness in the weld were examined. Additionally, the microstructural evolution during friction stir welding was also discussed. The stir zone consisted of fine equiaxed α grains surrounded by serrate grain boundaries, which were produced through the β → α allotropic transformation during the cooling cycle of friction stir welding. The fine α grains caused higher hardness than that in the base material. A lath-shaped α grain structure containing Ti borides and tool debris was observed in the surface region of the stir zone, whose hardness was the highest in the weld.
KW - Allotropic transformation
KW - Commercial purity titanium
KW - Friction stir welding
KW - Microstructure
KW - pcBN
UR - http://www.scopus.com/inward/record.url?scp=44149121997&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=44149121997&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2007.10.062
DO - 10.1016/j.msea.2007.10.062
M3 - Article
AN - SCOPUS:44149121997
SN - 0921-5093
VL - 488
SP - 25
EP - 30
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
IS - 1-2
ER -