1 河北科技大学材料科学与工程学院, 河北 石家庄 050018
2 河北科技大学河北省材料近净成形重点实验室,河北 石家庄050018
3 河北增材制造产业研究院, 河北 石家庄 050000
为解决编程繁琐性, 实现编程的自适应性, 得到较为理想的平面熔覆质量, 建立了送粉式平面激光熔覆搭接模型, 由单道熔覆线熔宽W=1.95 mm, 熔高H=0.64 mm, 计算得到了搭接轨迹中心距C=1.42 mm, 通过Simplify3D软件生成填充挤出线宽度k=100%与80%两种NC轨迹代码。采用侧向送粉方式, 进行316L金属粉末激光熔覆试验, 分析了熔覆层搭接形貌、微观组织及沿熔深方向上的显微硬度变化规律。试验表明: 填充挤出线宽度k=80%相比k=100%时平整度有所改善, 表现在凹坑的深度明显变浅、敞口宽度变窄; 熔覆层与基体为冶金结合, 无气孔产生, 熔覆层组织表现为枝晶、等轴细晶、平面晶; 熔覆层顶部到基体显微硬度大致呈现先增大后降低至基本趋于平稳的趋势, 其中最大硬度值为423.4 HV, 测量得到熔覆层组织硬度大约是基体的1.5~2.4倍。
激光熔覆 平面熔覆 搭接模型 微观组织 laser cladding surface cladding lap model Simplify3D Simplify3D microstructure
Author Affiliations
Abstract
1 Key Laboratory of In-fiber Integrated Optics of Ministry Education of China, Harbin Engineering University,Harbin 150001, China
2 National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology,Wuhan 430074, China
We propose an ultra-simple dual-channel configuration for simultaneously evaluating two branches of a multifunctional integrated optic chip (MFIOC). In the configuration, the MFIOC is employed as a beam splitter to construct the demodulation interferometer together with a 2 × 2 fiber coupler. Interference happens between polarization modes traveling through different channels of the MFIOC. The cross-couplings of each channel are respectively characterized by the interference peaks which distribute on opposite sides of the central interference peak. Temperature responses of the MFIOC are experimentally measured from ?40°C to 80°C. Results show that the proposed configuration can achieve simultaneous dual-channel transient measurements with resolution of ?90 dB and dynamic range of 90 dB. In addition, the two channels of the configuration have consistent measuring performance, and the two branches of the MFIOC have different responses to temperature variation.
Interferometry Interferometry Ellipsometry and polarimetry Ellipsometry and polarimetry Metrological instrumentation Metrological instrumentation Photonics Research
2015, 3(4): 04000115
桂林理工大学 化学与生物工程学院, 广西 桂林541004
采用量子化学B3LYP方法,在6-31G基组水平下对3种对苯二甲醛类巯基席夫碱进行几何构型优化,经振动分析,均未出现虚频率。在此基础上用TD-DFT方法计算了3种席夫碱化合物的荧光光谱,所得计算值与实验值基本相符。理论计算表明,对苯二甲醛类巯基席夫碱是一类荧光性质较好的荧光化合物。
巯基席夫碱 荧光光谱 量子化学 Thiol Schiff base derivatives fluorescent molecular switch quantum chemistry
