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Article: Microstructure of titanium welds: plates of commercially pure titanium were welded and microscopically analyzed to understand the influence of joining variables on weld microstructures.
- Article from:
- Advanced Materials & Processes
- Article date:
- February 1, 2003
- Author:
CopyrightCOPYRIGHT 2003 ASM International. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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The microstructure of titanium and titanium alloys can be very complex, because titanium undergoes an allotropic phase transformation at 882[degrees]C, where alpha (HCP) transforms to beta (BCC). This is similar to the well-known ferrite to austenite transformation in iron and steel. Thus, depending on processing, the microstructure of titanium can vary widely. For instance, annealed titanium can consist of an equilibrium microstructure with equiaxed grains, whereas titanium that has been rapidly cooled can form metastable phases, such as martensite or bainite, and possess Widmanstatten plates, or have an acicular microstructure.
During welding, a small portion ...