The topography and near-surface microstructure of TC4 Ti alloy treated by electron beam surfi-sculptTM were studied. It was found that the non-smooth surface of TC4 alloy exhibited wave shaped grooves with sizes able to be customized by adjusting processing parameters. The ridge of the groove displayed continuous scales while the valley presented inverted V shape stripes. The dimensions of the ridge and valley are also related to and could be controlled by processing parameters. The near-surface region of TC4 alloy treated by electron beam surfi-sculptTM is occupied by the fusion zone, heat affected zone and base metal from the top down to the underlying bulk alloy. The microstructure of the fusion zone is characterized by martensite phase, while the heat affected zone sandwiched between the fusion zone and the base metal also presented microstructures different from that of the base metal. The fusion zone and heat affected zone possesses higher micro-hardness compared with the base metal, with the maximum value appearing at the interface between the fusion zone and the heat affected zone. A fluid-drag reduction efficiency over 15% is achieved on TC4 alloys treated by electron beam surfi-sculptTM.
LI Kai
,
FU Pengfei
,
TANG Daibin
,
WU Bing
,
TANG Zhenyun
. Topography and near-surface microstructure of TC4 alloy treated by electron beam surfi-sculptTM[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017
, 38(12)
: 421361
-421361
.
DOI: 10.7527/S1000-6893.2017.421361
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