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| 1 | Laser additive manufacturing of Zn porous scaffolds: Shielding gas flow, surface quality and densification显示文摘Zn based metals have exhibited promising prospects as a structural material for biodegradable applications. Pure Zn porous scaffolds were produced by laser powder bed fusion(LPBF) based on data files of designing and CT scanning. Massive Zn evaporation during laser melting largely influenced the formation quality during LPBF of Zn metal. The metal vapor in processing chamber was blown off and suctioned out efficiently by an optimized gas circulation system. Numerical analysis was used to design and testify the performance of gas flow. The surface of scaffolds was covered with numerous particles in different sizes. Processing pores occurred near the outline contour of struts. The average grain size in width was8.5m, and the hardness was 43.8 HV. Chemical plus electrochemical polishing obtained uniform and smooth surface without processing pores, but the diameter of struts reduced to 250 αm from the design value 300 m. The poor surface quality and processing pores were resulted by the splashing particles included spatters and powders due to the recoil force of evaporation, and the horizontal movement of liquid metal due to overheating and wetting. The insufficient melting at the outline contour combined with good wetting of Zn liquid metal further increased the surface roughness and processing pores. | Peng Wen Yu Qin Yanzhe Chen Maximilian Voshage Lucas Jauer Reinhart Poprawe Johannes Henrich Schleifenbaum | 2019 | Journal of Materials Science & Technology2019，35，2： | 9 |
| 2 | Influence of additive multilayer feature on thermodynamics, stress and microstructure development during laser 3D printing of aluminum-based material显示文摘A transient three dimensional model for describing the temperature behavior,thermo-capillary convection,microstructure evolution and the resultant mechanical properties during selective laser melting of Al N/Al Si10 Mg composite is proposed.The powder-solid transformation,temperature dependent physical properties and the preservation of the heat are taken into account.The effect of the additive manufacturing multilayer feature on the molten pool dynamics,cooling rate,crystal size,microstructure morphology,micro-hardness and types of the residual stress has been investigated.It shows that the operating temperature and the thermo-capillary convection obtained within the molten pool generally increases as the processing multilayers are successively added,while the thermal effect depth is negatively reduced.The preferential direction of the heat diffusion generally changes from a downward pattern,then to the slightly strengthened horizontal direction and finally to a typically horizontal one for various deposited layers being processed.Therefore,the microstructure of the solidified part along the building direction(Region I to Region V) undergoes an interesting transformation:directional columnar cellular microstructure,crosswise-extended cellular microstructure,refined cellular microstructure,fragmentation microstructure and the coarse cellular microstructure.The tensile stress and the compressive stress are comprehensively obtained within the finally solidified layers,significantly influencing the microhardness. | Donghua Dai Dongdong Gu Reinhart Poprawe Mujian Xia | 2017 | Science Bulletin2017，62，11： | 6 |
| 3 | Applications of laser transmission processes for the joining of plastics, silicon and glass micro parts显示文摘 | Sail F Hoffmann W M Poprawe E R | 2008 | Microsyst Technol2008，14，： | 1 |
| 4 | Densification behavior, microstructure evolution, and wear performance ofselective laser melting processed commercially pure titanium 显示文摘 | GU D D HAGEDOMRN Y C MEINERS W MENG G B BATISTA R J S WISSENBACH K POPRAWE R | 2012 | Acta Materialia2012，60，9： | 1 |
| 5 | Production cell for laser joining of microsystems with modular'pick and join' tools 显示文摘 | L Bosse A Boglea R Poprawe | 2006 | Microsystem Technologies2006，12，7： | 1 |
| 6 | Manufacturing with novel high-power diode lasers显示文摘 | Schulz W Poprawe R | 2000 | IEEE Journal of Selected Topics in Quantum Electronics2000，6，： | 1 |
| 7 | Laser transmission joining in microtechnology显示文摘 | Edmund Haberstroh Wolf-Martin Hoffmann Reinhart Poprawe | 2006 | Microsyst Technol2006，8，： | 1 |
| 8 | Hydrodynamics of material removal by melt expulsion: perspectives of laser cutting and drilling显示文摘 | Reinhart Poprawe Wolfgang Schulz Robert Schmitt | 2010 | Physics Procedia2010，，： | 1 |
| 9 | Development and application of new high-power laser bean source显示文摘 | Poprawe R Schulz W | 2003 | Focused on Laser Precision Microfabrication2003，50，： | 1 |
| 10 | Modeling,Monitoring and Control in High Quality Laser Cutting显示文摘 | Poprawe R | 2001 | Annals of the CIRP2001，50，： | 1 |
| 11 | Locally selective bonding of silicon and glass with laser显示文摘 | Wild M J Gillner A Poprawe R | 2001 | Sensors and Acuators2001，93，： | 1 |
| 12 | Locally selective bonding of silicon and glass with laser显示文摘 | GILLNER A POPRAWE R | 2001 | Sensors and Actuators2001，93，1： | 1 |
| 13 | Locally selective bonding of silicon and glass with laser 显示文摘 | WILD M J GILLNER A POPRAWE R | 2001 | Physica2001，93，1： | 1 |
| 14 | Manufacturing with novel high-power diode lasers 显示文摘 | Wolfgang Schulz Reinhart Poprawe | 2000 | IEEE Journal of Selected Topics in Quantum Electronics2000，6，4： | 1 |
| 15 | Locally selective bonding of silicon and glass with laser 显示文摘 | WILD M J GILLNER A POPRAWE R | 2001 | Physica2001，93，1： | 1 |
| 16 | Net shaped high performance oxide ceramic parts by selective laser melting显示文摘 | HAGEDORN Y C WILKES J MEINERS W WISSENBACH K POPRAWE R | 2010 | Physics Procedia2010，5，： | 1 |
| 17 | Manufacturingwithnovelhighpowerdiodelasers显示文摘 | SchulzW PopraweR | 2000 | IEEEJSelTopQuantum Electron2000，6，7： | 1 |
| 18 | Locally selective bonding of silicon and glass with laser显示文摘 | Wild M J Gillner A Poprawe R | 2001 | Sensors and Actuators A2001，93，： | 1 |
| 19 | Locally selective bonding of silicon and glass with laser显示文摘 | WILD M J GILLNER A POPRAWE R | 2001 | Sensors and Actuators A:physical2001，93，1： | 1 |
| 20 | Development and application of new high-power laser beam sources显示文摘 | Poprawe R Schulz W | 2003 | RIKEN Review2003，1，50： | 1 |
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