3D打印TC4钛合金的成形工艺与热处理行为研究

发布时间：2019-06-06 15:58

【摘要】：采用同轴送粉的沉积方式进行了3D打印TC4钛合金的研究,分析了激光功率、扫描速度、扫描方向以及固溶时效热处理工艺对TC4钛合金组织和力学性能的影响,并分析了其作用机理。结果表明:不同激光功率下TC4钛合金的宏观组织都为定向外延生长的粗大β柱状晶形态;当扫描速度从0.12 m/min增加至0.60 m/min时,柱状晶的宽度呈现逐渐减小的趋势,而柱状晶高度逐渐增加,且随着扫描速度的增加,柱状晶与扫描方向的夹角逐渐增大;单向扫描时TC4钛合金的柱状晶呈现定向外延生长趋势,而往返扫描时TC4钛合金的柱状晶由定向生长转变为双相生长,且沉积层间还出现了一定数量的等轴晶。3D打印TC4钛合金的强度都超过国标对铸件和锻件退火态TC4钛合金的要求,但是断后伸长率较低;经过固溶和时效热处理后,TC4钛合金的强度略有降低而断后伸长率明显提高,主要原因与沉积态魏氏组织转变为热处理态网篮组织有关。
[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.
【作者单位】：武昌首义学院;武汉工程大学;
【分类号】：TG146.23;TG166.5

【相似文献】