Research of Post-Treatment Effect on Structure of Alloys Manufactured Using Additive Technologies

2022 ◽  
Vol 1049 ◽  
pp. 69-74
Author(s):  
Evgeny Remshev ◽  
Vitaly Ignatenko ◽  
Sergey Voinash ◽  
Irina Teterina ◽  
Vladimir Malikov ◽  
...  
Keyword(s):  
Treatment Effect ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Cold Isostatic Pressing ◽  
Subsequent Treatment ◽  
Additive Technologies ◽  
Post Treatment ◽  
Isostatic Pressing ◽  
Post Treatment Effect

The effect of cold isostatic pressing of EP648 alloy after selective laser sintering is researched. The effect of cold isostatic pressing on the porosity of the structure of a material manufactured by additive technologies (AT) has been established. It is proposed to consider cold isostatic pressing as a method of subsequent treatment of products ("post-treatment") made by selective laser sintering.

Microstructures and Properties of Cu–AISI304 Parts Fabricated by Improved Selective Laser Sintering

2009 ◽  
Vol 131 (4) ◽  
Author(s):  
Z. L. Lu ◽  
J. H. Liu ◽  
Y. S. Shi
Keyword(s):  
High Performance ◽  
Selective Laser Sintering ◽  
Hot Isostatic Pressing ◽  
Processing Parameters ◽  
Laser Sintering ◽  
Cold Isostatic Pressing ◽  
Isostatic Pressing ◽  
Cu Content ◽  
Mechanical Performances ◽  
Liquid Sintering

For fabricating complex AISI304 parts with high performance by advanced powder/metallurgy technologies, cold isostatic pressing (CIP) is introduced into selective laser sintering (SLS) combined with hot isostatic pressing (HIP), which is abbreviated to selective laser sintering/isostatic pressed (SLS/IP). The effect of processing parameters on the densification of Cu–AISI304 parts is analyzed and then the influence of Cu on their relative densities, metallurgical structures, and mechanical performances are investigated. The results show that relative densities of Cu–AISI304 parts fabricated by SLS/IP are mainly influenced by CIP pressure and sintering temperature, and it is interesting to find that the formula 1−D=(1−D0)e−kP is testified by the CIP of SLS/IP. There is an antidensification phenomenon resulting from Cu and AISI304 in liquid sintering, but the relative densities of Cu–AISI304 parts can be gradually improved in HIP with Cu content increasing from 1 wt % to 3 wt %. After the above-mentioned Cu–AIS304 parts are finally hot isostatic pressed, their metallurgical structures consist of sosoloid (Cu,Ni) and (Fe,Ni) besides austenite (Fe,Cr,Ni,C), their best mechanical performances are close to those of solution treated compact AISI304 when Cu content is 3 wt %.

Investigation into Indirect Selective Laser Sintering Alumina Ceramic Parts Combined with Cold Isostatic Pressing

2012 ◽  
Vol 217-219 ◽  
pp. 2217-2221 ◽  
Author(s):  
Kai Liu ◽  
Chen Hui Li ◽  
Wen Ting He ◽  
Yu Sheng Shi ◽  
Jie Liu
Keyword(s):  
Bending Strength ◽  
Orthogonal Experiment ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Cold Isostatic Pressing ◽  
Alumina Ceramic ◽  
Alumina Powder ◽  
Isostatic Pressing ◽  
Scan Speed ◽  
Resin Binder

To obtain complex shape alumina ceramic parts, a composite powder of epoxy resin binder E-06 and alumina powder are laser sintered combined with cold isostatic pressing(CIP). An orthogonal experiment is carried out to probe the influencing factors of selective laser sintering (SLS) alumina green parts. When preheating temperature, laser power, scan speed, scan spacing and layer thickness are, respectively, 60°C,14 w, 2000 mm/s, 0.10 mm/s and 0.10 mm, the density and bending strength of alumina parts are relatively high. Then, airproof canning prepared for CIP is manufactured in the vacuum environment. Finally, the optimized SLS/CIP alumina parts are degreased and sintered in 1600 °C to produce crack-free alumina parts. The sintered relative density of the parts however is limited to only 57% but the forming integrity during SLS and CIP remains after sintering.

Finite Element Simulation of Combined Forming of Selective Laser Sintering and Cold Isostatic Pressing

2010 ◽  
Vol 26-28 ◽  
pp. 60-66
Author(s):  
Yan Ying Du ◽  
Yu Sheng Shi ◽  
Qing Song Wei
Keyword(s):  
Finite Element ◽  
Metal Powder ◽  
Selective Laser Sintering ◽  
Good Method ◽  
Laser Sintering ◽  
Cold Isostatic Pressing ◽  
High Porosity ◽  
Isostatic Pressing ◽  
Metal Parts ◽  
Short Time

Selective Laser Sintering could manufacture high complex metal parts in short time but with high porosity and low strength. The components from Cold Isostatic Pressing have excellent performance with uniform organizational structure, high size precision, and high density. It, however, could not form high complex parts because of the difficulties of bag manufacture. So it will be a good method to combine Selective Laser Sintering and Cold Isostatic Pressing to make complicated metal parts. In this paper, the specimens of stainless steel were made by the combined Selective Laser Sintering and Cold Isostatic Pressing forming route. And the simulation of Cold Isostatic Pressing was carried out by finite element method and Drucker-Prager-Cap constitutive model in ABAQUS/Explicit computer program. The property of metal powder was measured by experiments. The effects of bag on Cold Isostatic Pressing have been discussed. It is different from the Cold Isostatic Pressing of metal powder that the bag has little influence on both shape and size of the specimen. The results of simulation show a good agreement between the experimental results and the calculated results. The simulation can give a useful direction to dimension and shape designs of the combined forming of Selective Laser Sintering and Cold Isostatic Pressing.

Properties of Alumina Green Parts via Selective Laser Sintering Combined with Cold Isostatic Pressing

2013 ◽  
Vol 325-326 ◽  
pp. 83-87
Author(s):  
Kai Liu ◽  
Chen Hui Li ◽  
Wen Ting He ◽  
Yu Sheng Shi
Keyword(s):  
Bending Strength ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Cold Isostatic Pressing ◽  
Maximum Pressure ◽  
Alumina Powder ◽  
Isostatic Pressing ◽  
Whole Process ◽  
S 100 ◽  
Scan Speed

To obtain complex shape alumina ceramic parts, a composite powder of epoxy resin binder E-06 and alumina powder were laser sintered combined with cold isostatic pressing (CIP). Experiments on selective laser sintering (SLS) and CIP were carried out to probe the influencing factors in the processes of forming alumina green parts. When laser power, scan speed, scan spacing and layer thickness were, respectively, 21 w, 1800 mm/s, 100 μm and 150 μm, the density and bending strength of alumina parts were relatively high. Following that, we experimented on different CIP maximum pressure which had different effects on densification of SLS alumina parts, the whole process in CIP was divided into two stages of I and II. Finally, the optimized SLS/CIP alumina parts were degreased and then sintered in 1600 °C for 2 h to produce crack-free alumina parts.

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