Balling Process in Selective Laser Sintering 316 Stainless Steel Powder

2006 ◽  
Vol 315-316 ◽  
pp. 357-360 ◽  
Author(s):  
Yi Fu Shen ◽  
D.D. Gu ◽  
Y.F. Pan
Keyword(s):  
Stainless Steel ◽  
Laser Power ◽  
Selective Laser Sintering ◽  
Steel Powder ◽  
Laser Sintering ◽  
Stainless Steel Powder ◽  
Surface Tension Effect ◽  
316 Stainless Steel ◽  
Scan Speed ◽  
Moderate Range

Balling process in selective laser sintering of 316 stainless steel powder was investigated. It showed that the balling phenomenon was ascribed to the higher liquid viscosity and surface tension effect during laser sintering. The effects of laser power and scan speed on the balling initiation was studied. It was found that increasing laser power and scan speed within a moderate range can reduce balling effect. However, care should be taken to control laser powers and scan speeds that can be used since their excessive increase may give rise to detrimental effects.

Fundamentals of Selective Laser Sintering of 316 Stainless Steel Powder

2011 ◽  
Vol 464 ◽  
pp. 703-707 ◽  
Author(s):  
Pei Kang Bai ◽  
Yu Xin Li ◽  
Bin Liu
Keyword(s):  
Stainless Steel ◽  
Line Width ◽  
Layer Structure ◽  
Selective Laser Sintering ◽  
Single Layer ◽  
Steel Powder ◽  
Laser Sintering ◽  
Processing Parameter ◽  
316 Stainless Steel ◽  
Scan Line

Selective laser sintering technology is used for manufacturing parts from 316 stainless steel powders. Experiments were carried out on a Nd:YAG laser machine (LMY400) with 400W. Powder is layered by a roller over the surface of a 100mm diameter build cylinder. Effects of processing parameter on the scan line width, the scan line height, the single layer structure and the multilayer structure are investigated. The results show laser power, scan speed and layer thickness have a great effect on the scan line width and line height. Furthermore, the stable and continuous vectors are formed with the increasing of the number of layers.

scholarly journals Selective Laser Sintering and Infiltration Characteristics of Resin-Coated Stainless Steel Powder.

2002 ◽  
Vol 49 (12) ◽  
pp. 1098-1103 ◽  
Author(s):  
Liew Loy Seng ◽  
Masahiro Umeda ◽  
Katsuhiro Maekawa ◽  
Shinichi Iida ◽  
Tomoya Suzuki
Keyword(s):  
Stainless Steel ◽  
Selective Laser Sintering ◽  
Steel Powder ◽  
Laser Sintering ◽  
Stainless Steel Powder

Selective Laser Sintering and Subsequent Gas Nitrocarburizing of Low Carbon Steel Powder

2008 ◽  
Vol 2 (3) ◽  
pp. 168-174 ◽  
Author(s):  
Takayuki Nakamoto ◽  
◽  
Nobuhiko Shirakawa ◽  
Yoshio Miyata ◽  
Takumi Sone ◽  
...  
Keyword(s):  
Energy Density ◽  
Volume Fraction ◽  
Selective Laser Sintering ◽  
Low Carbon Steel ◽  
Steel Powder ◽  
Laser Sintering ◽  
Low Carbon ◽  
Optimum Conditions ◽  
Scan Speed ◽  
Very High

Optimum conditions for laser irradiation to achieve fully dense SLS (Selective Laser Sintering) specimens have been investigated for S15C steel, in order to check the industrial feasibility of the SLS process. The mechanical properties of SLS processed S15C steel as well as the surface hardenability have also been investigated. The volume fraction of pores in S15C steel decreases as the scan speed, scan spacing and layer thickness decrease and as the laser power increases, so that the density of SLS specimens increases as the energy density increases. The specimens sintered at an energy density of 800 J/mm3 exhibit very low porosity and, hence, very high density, comparable to those of the corresponding wrought material. Complete elimination of pores is indispensable for the ductility and strength of SLS specimens. Excellent wear resistance can be provided with the surface of S15C steel produced by the SLS process by gas nitrocarburizing because of the formation of Fe2-3N nitride with a very high value of microhardness on the surface.

Effect of Process Parameters on Temperature Field during Laser Sintering of 316L Stainless Steel Powder

2013 ◽  
Vol 668 ◽  
pp. 844-849 ◽  
Author(s):  
Nai Fei Ren ◽  
Dian Wang ◽  
Lei Jia ◽  
Xiao Bing Ge
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stainless Steel ◽  
Temperature Field ◽  
316L Stainless Steel ◽  
Steel Powder ◽  
Scanning Speed ◽  
Laser Sintering ◽  
Stainless Steel Powder ◽  
Element Analysis

Finite element analysis software ANSYS is a platform, Using the Parametric Design Language of APDL language to write programs to simulate the temperature field of the laser sintering of 316L stainless steel powder. Building the model of Finite element analysis to analysis the simulation's various difficulties, such as the thermal parameters at different temperatures, the loading of the heat flux and some of the key parameters. Researching the affect of laser power and scanning speed on the temperature field, it’s valuable in researching the temperature field of the metal powder sintering

The Optimization Design Study of Selective Laser Sintering Process Parameters on the Pro-Coated Sand Mold

2011 ◽  
Vol 55-57 ◽  
pp. 853-858
Author(s):  
Rong Cheng ◽  
Xiao Yu Wu ◽  
Jian Ping Zheng
Keyword(s):  
Layer Thickness ◽  
Process Parameters ◽  
Laser Power ◽  
Selective Laser Sintering ◽  
Dimensional Accuracy ◽  
Processing Parameters ◽  
Laser Sintering ◽  
Process Variables ◽  
Scan Speed ◽  
Coated Sand

This paper presents experimental investigations on influence of important process parameters viz., laser power, scan speed, layer thickness, hatching space along with their interactions on dimensional accuracy of Selective Laser Sintering (SLS) processed pro-coated sand mold. It is observed that dimensional error is dominant along length and width direction of built mold. Optimum parameters setting to minimize percentage change in length and width of standard test specimen have been found out using Taguchi’s parameter design. Optimum process conditions are obtained by analysis of variance (ANOVA) is used to understand the significance of process variables affecting dimension accuracy. Scan speed and hatching space are found to be most significant process variables influencing the dimension accuracy in length and width. And laser power and layer thickness are less influence on the dimension accuracy. The optimum processing parameters are attained in this paper: laser power 11 W; scan speed 1200 mm/s; layer thickness 0.5 mm and hatching space 0.25 mm. It has been shown that, on average, the dimensional accuracy under this processing parameters combination could be improved by approximately up to 25% compared to other processing parameters combinations.

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