采用金相观察、X射线衍射及布氏硬度、室温冲击等分析测试方法, 研究了激光立体成形工艺对飞行器结构材料TC11钛合金组织和力学性能的影响。结果发现, 采用不同激光功率制备试样微观组织均为网篮组织, 小功率试样微观组织编织更细密, α板条宽度更小。小功率试样比大功率试样高约15 HB, 二者均高于锻件标准(GJB2744A-2007)硬度范围。小功率试样冲击韧性基本达到锻件标准, 而大功率试样冲击韧性低于该锻件标准, 在冲击载荷下前者的失效方式为穿晶韧性断裂, 而后者的失效方式则由穿晶韧性断裂逐渐向α板条解理断裂过渡。

The microstructure and mechanical properties of laser solid formed (LSF) TC11 titanium alloy, as one of the candidate materials for aircraft structures, was investigated with Optical Microscopy(OM), X-Ray Diffraction(XRD), Brinell hardness(HB) and room temperature impact test. The microstructure of LSF samples with different laser power both exhibited basket weave, and low power forming samples were consisted of finer acicular α and α＋β basket weave compared with those of high power forming samples. The Brinell hardness of different laser power forming samples both surpassed the forging standard of GJB2744A-2007, and the Brinell hardness of low power forming samples was higher than that of high power forming samples about 15HB. Impact toughness of low power forming samples reached the forging standard, while that of high power forming samples was below to the standard. And at the impact load their failure mode were transgranular ductile fracture and gradually transiting from transgranular ductile fracture to α lath cleavage fracture, respectively.