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TC17鈦合金構件激光直接成形固態(tài)相變行為及顯微組織
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國家“973”計劃資助項目（2011CB606305）


Solid-State Phase Transformation and Microstructure of Laser Direct Manufactured TC17 Titanium Alloy Components
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    摘要:

    采用激光熔化沉積技術直接成形TC17鈦合金構件，利用OM、SEM以及XRD分析其顯微組織特征，并重點研究了其在激光短時循環(huán)加熱冷卻作用下的固態(tài)相變行為及顯微組織演化特點。結果表明，激光熔化沉積TC17鈦合金具有定向外延生長的“指節(jié)”狀晶粒和少量等軸晶交替排列的凝固組織，其顯微組織是由不規(guī)則片狀初生a相和細小網籃狀β轉變組織組成的超細特殊雙態(tài)組織。最后約12個沉積層內由于熱循環(huán)歷史不同，使得不同沉積層固態(tài)相變顯微組織不同：頂部4個沉積層內顯微組織為相變點以上快速冷卻形成的細針狀馬氏體，第N-4~N-6層由細針狀馬氏體和馬氏體分解形成的少量不規(guī)則片狀初生a相組成，第N-7~N-11層內逐漸形成特殊雙態(tài)組織。

    Abstract:

    Microstructure characteristics of the laser melting deposited TC17 titanium alloy components were analyzed by OM, SEM and XRD. The solid-state phase transformation and the microstructure evolution under the effect of laser short term cycle of heating and cooling were researched. Results show that the laser melting deposited TC17 titanium alloy consists of directionally solidified “knuckle” grains and a few equiaxed grains, which are arranged alternately. The microstructure of the laser melting deposited TC17 titanium alloy is fine duplex microstructure composed of irregular primary lamellar a and basketwave transformed β. Solid-phase transformation is shown in the last twelve depositing layers: the microstructure in the last four layers is Martensite; in the 5th to 7th layer is mainly acicular a and a little irregular coarse a; in the 8th to 12th layer is coarser and shorter a with underdeveloped serrated interface and the second a is fine basketwave microstructure.

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孫曉敏,劉 棟,湯海波,王華明. TC17鈦合金構件激光直接成形固態(tài)相變行為及顯微組織[J].稀有金屬材料與工程,2013,42(4):724~729.[Sun Xiaomin, Liu Dong, Tang Haibo, Wang Huaming. Solid-State Phase Transformation and Microstructure of Laser Direct Manufactured TC17 Titanium Alloy Components[J]. Rare Metal Materials and Engineering,2013,42(4):724~729.]
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  • 收稿日期:2012-04-29
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