【摘要】：采用同軸送粉的沉積方式進行了3D打印TC4鈦合金的研究,分析了激光功率、掃描速度、掃描方向以及固溶時效熱處理工藝對TC4鈦合金組織和力學(xué)性能的影響,并分析了其作用機理。結(jié)果表明:不同激光功率下TC4鈦合金的宏觀組織都為定向外延生長的粗大β柱狀晶形態(tài);當(dāng)掃描速度從0.12 m/min增加至0.60 m/min時,柱狀晶的寬度呈現(xiàn)逐漸減小的趨勢,而柱狀晶高度逐漸增加,且隨著掃描速度的增加,柱狀晶與掃描方向的夾角逐漸增大;單向掃描時TC4鈦合金的柱狀晶呈現(xiàn)定向外延生長趨勢,而往返掃描時TC4鈦合金的柱狀晶由定向生長轉(zhuǎn)變?yōu)殡p相生長,且沉積層間還出現(xiàn)了一定數(shù)量的等軸晶。3D打印TC4鈦合金的強度都超過國標(biāo)對鑄件和鍛件退火態(tài)TC4鈦合金的要求,但是斷后伸長率較低;經(jīng)過固溶和時效熱處理后,TC4鈦合金的強度略有降低而斷后伸長率明顯提高,主要原因與沉積態(tài)魏氏組織轉(zhuǎn)變?yōu)闊崽幚響B(tài)網(wǎng)籃組織有關(guān)。
[Abstract]:The effect of laser power, scanning speed, scanning direction and solution aging heat treatment on the microstructure and mechanical properties of TC4 titanium alloy was studied by the method of co-axial powder deposition, and its mechanism of action was also analyzed. The results show that the macro-structure of TC4 titanium alloy under different laser power is the coarse and crystalline morphology of the directional epitaxial growth; when the scanning speed is increased from 0.12 m/ min to 0.60 m/ min, the width of the columnar crystal is gradually reduced, and the columnar crystal height is gradually increased. and with the increase of the scanning speed, the included angle between the columnar crystal and the scanning direction is gradually increased; the columnar crystal of the TC4 titanium alloy in the one-way scanning shows the orientation epitaxial growth trend, and the columnar crystal of the TC4 titanium alloy is changed into two-phase growth by the directional growth during the round-trip scanning, and the strength of the 3D printing TC4 titanium alloy exceeds the requirements of the national standard on the TC4 titanium alloy of the casting and the forging, but the elongation at break is lower; after the solution and the aging heat treatment, The strength of TC4 titanium alloy decreased slightly, and the elongation after fracture was obviously improved, and the main reason was related to the transition of the deposited state Wei's tissue to the heat-treated net basket.
【作者單位】： 武昌首義學(xué)院;武漢工程大學(xué);
【分類號】：TG146.23;TG166.5

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