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Micro-morphology and Formability of Stainless Steel Components Produced by Selective Laser Melting

Author: GuanKai
Tutor: ZengXiaoYan；WangZeMin
School: Huazhong University of Science and Technology
Course: Materials Processing Engineering
Keywords: Selective laser melting Melting high Weld width Dilution rate Process parameters
CLC: TG665
Type: Master's thesis
Year: 2009
Downloads: 61
Quote: 1
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Abstract


Selective Laser Melting (SLM) technology is a new method for the direct manufacturing of metal parts , integration of rapid prototyping technology and laser cladding technology have the unique aspects of its small size , high-precision , low surface roughness and structure of complex metal parts manufacturing technical advantages , has a strong practical value and broad application prospects , but the lack of the underlying process hindered the promotion and application of the technology . In response to these issues , the process and single-channel from the Shop powder cladding lines , followed by research on the surface of a single layer , thin-walled wall and block entity laser molding molding process parameters optimized laser melting . This paper systematically studied the laser energy density , laser power , scanning speed , thick powder Shop overlapping ratio SLM technology part quality . The results show that the laser energy density is the most important factor affecting the the SLM parts forming quality . When the laser energy density is lower than the 2.7J/mm2 this critical value , the cladding lines can not be molded. By way to improve the laser power to increase the energy density to enhance the effect of the molding mass to reduce the scanning velocity to increase the energy density than using more remarkable. Selective laser melting , melting of the cladding layer high weld width and dilution rate is closely related to the laser processing parameters , including the size of the dilution rate can be used for quantitative analysis cladding lines forming quality . The results show that , when the dilution ratio is greater than 50% obtained without defects cladding lines, while the dilution rate is greater than 20% obtained when the low-defect cladding lines . In addition, the sample variance analysis method to research the relationship of the single-layer structure and the surface of the thin wall parts quality and process parameters , and optimized based on the single-layer structure of the entities forming entities molding process parameters . 0.2mm thick powder Shop the laser power of 150 W , the scanning speed of 24m/min , 33% overlap rate forming entity parts microhardness distribution is more uniform , the molding powder material before and after phase basically unchanged .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal cutting and machine tools > Special machine tools and processing > Light processing equipment and processing
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