摘要
The microstructure characteristics of laser forming repaired （LFR） Ti60 （Ti-5.6Al-4.8Sn-2Zr-1Mo-0.35Si- 0.3Nb） as-deposited and annealed samples are analyzed. The microstructure of as-deposited repaired zone （RZ） consists of epitaxial columnar prior β grains, in which fine woven α laths and βphase between α laths exist. The heat-affected zone （HAZ） experiences a continuous microstructural transition from duplex microstructure of the base metal zone （BMZ） to the microstructure of RZ. The presence of silicide precipitates is observed in both RZ and BMZ in an annealed sample by transmission electron microscopy. They are identified as （Ti, Zr）6Si3 distributed mainly at The fine α2 precipitates are detected in BMZ by electron the α/β interface with the size of 100-300 nm diffraction; there was no α2 detected in RZ.
The microstructure characteristics of laser forming repaired （LFR） Ti60 （Ti-5.6Al-4.8Sn-2Zr-1Mo-0.35Si- 0.3Nb） as-deposited and annealed samples are analyzed. The microstructure of as-deposited repaired zone （RZ） consists of epitaxial columnar prior β grains, in which fine woven α laths and βphase between α laths exist. The heat-affected zone （HAZ） experiences a continuous microstructural transition from duplex microstructure of the base metal zone （BMZ） to the microstructure of RZ. The presence of silicide precipitates is observed in both RZ and BMZ in an annealed sample by transmission electron microscopy. They are identified as （Ti, Zr）6Si3 distributed mainly at The fine α2 precipitates are detected in BMZ by electron the α/β interface with the size of 100-300 nm diffraction; there was no α2 detected in RZ.
基金
supported by the Research Fund of the State Key Laboratory of Solidification Processing (NWPU), China (No. 33-TP-2009)
the National Natural Science Foundation of China (No. 50871089)
the Programme of Introducing Talents of Discipline to Universities of China (No. 08040)
