Microstructural evolution of fusion zone in laser beam welds of pure titanium

Journal Article · Thu Mar 15 00:00:00 EDT 2012 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2011.12.010· OSTI ID:22066423

Liu, H ^[1]; Nakata, K ^[2]; Zhang, J X ^[3]; Yamamoto, N; Liao, J ^[4]

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1. State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049 (China) and Joining and Welding Research Institute, Osaka University, Ibaraki 567-0047 (Japan)
2. Joining and Welding Research Institute, Osaka University, Ibaraki 567-0047 (Japan)
3. State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049 (China)
4. Technology Development Headquarters, Kurimoto Ltd., Osaka 559-0021 (Japan)

Microstructural evolution of fusion zone in laser beam welds of pure titanium was studied by means of electron backscattering diffraction. The microstructural evolution is strongly affected by the {beta} {yields} {alpha} transformation mechanism dependent on the cooling rate during phase transformation. The long-range diffusional transformation mainly occurs in the fusion zone at the low cooling rate, and the massive transformation dominantly takes place at the high cooling rate. For this reason, the grain morphologies probably change from the granular-like to columnar-like grains with the cooling rate increasing. - Highlights: Black-Right-Pointing-Pointer Microstructures of fusion zone in laser beam welds of pure titanium are studied. Black-Right-Pointing-Pointer Increasing cooling rate changes grain morphology from granular to columnar one. Black-Right-Pointing-Pointer Final microstructures depend on the {beta}{yields}{alpha} transformation mechanisms.

• OSTI ID: 22066423
• Journal Information: Materials Characterization, Vol. 65, Issue Complete; Other Information: Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COOLING
ELECTRON DIFFRACTION
GRANULAR MATERIALS
LASER WELDING
MICROSTRUCTURE
MORPHOLOGY
PHASE TRANSFORMATIONS
TITANIUM
WELDED JOINTS