Freeform Fabrication of High Performance Titanium Components via SLS/HIP

1998 ◽  
Vol 542 ◽  
Author(s):  
S. Das ◽  
J. J. Beaman ◽  
M. Wohlert ◽  
D. L. Bourell
Keyword(s):  
High Performance ◽  
Selective Laser Sintering ◽  
Hot Isostatic Pressing ◽  
Laser Sintering ◽  
Single Step ◽  
Isostatic Pressing ◽  
Freeform Fabrication ◽  
Post Process ◽  
Processed Material ◽  
Full Densification

AbstractThis paper presents the development of Selective Laser Sintering/Hot Isostatic Pressing (SLS/HIP) technology for production of functional high performance components in the titanium alloy Ti-6AI-4V. SLS/HIP is a net shape manufacturing technique that combines and exploits the freeform shaping capability of selective laser sintering and the full densification capability of hot isostatic pressing. The advantages of SLS combined with in situ HIP encapsulation include single step net shape canning, full densification by containerless HIP, no container-powder adverse interactions, reduced pre-processing time, and minimal post-process machining compared to conventional HIP of canned powders. Microstructure and mechanical properties of SLS processed and HIP post-processed Ti-6A1-4V are consistent with conventionally processed material. The potential of SLS/HIP technology was demonstrated by net shape fabricating a component to specification, namely the titanium guidance section housing base for the AIM-9 Sidewinder missile.

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 %.

Producing metal parts with selective laser sintering/hot isostatic pressing

JOM ◽  
1998 ◽  
Vol 50 (12) ◽  
pp. 17-20 ◽  
Author(s):  
Suman Das ◽  
Martin Wohlert ◽  
Joseph J. Beaman ◽  
David L. Bourell
Keyword(s):  
Selective Laser Sintering ◽  
Hot Isostatic Pressing ◽  
Laser Sintering ◽  
Isostatic Pressing ◽  
Metal Parts

Selection of selective laser sintering materials for different applications

2015 ◽  
Vol 21 (6) ◽  
pp. 630-648 ◽  
Author(s):  
Sunil Kumar Tiwari ◽  
Sarang Pande ◽  
Sanat Agrawal ◽  
Santosh M. Bobade
Keyword(s):  
Process Parameters ◽  
High Performance ◽  
Material Selection ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Optimal Process ◽  
Content Type ◽  
Volume Production ◽  
High Performance Application ◽  
Selection Of

Purpose – The purpose of this paper is to propose and evaluate the selection of materials for the selective laser sintering (SLS) process, which is used for low-volume production in the engineering (e.g. light weight machines, architectural modelling, high performance application, manufacturing of fuel cell, etc.), medical and many others (e.g. art and hobbies, etc.) with a keen focus on meeting customer requirements. Design/methodology/approach – The work starts with understanding the optimal process parameters, an appropriate consolidation mechanism to control microstructure, and selection of appropriate materials satisfying the property requirement for specific application area that leads to optimization of materials. Findings – Fabricating the parts using optimal process parameters, appropriate consolidation mechanism and selecting the appropriate material considering the property requirement of applications can improve part characteristics, increase acceptability, sustainability, life cycle and reliability of the SLS-fabricated parts. Originality/value – The newly proposed material selection system based on properties requirement of applications has been proven, especially in cases where non-experts or student need to select SLS process materials according to the property requirement of applications. The selection of materials based on property requirement of application may be used by practitioners from not only the engineering field, medical field and many others like art and hobbies but also academics who wish to select materials of SLS process for different applications.

Densification of Alumina Components Via Indirect Selective Laser Sintering Combined with Isostatic Pressing

Applied laser ◽  
2013 ◽  
Vol 33 (1) ◽  
pp. 1-6
Author(s):  
史玉升 Shi Yusheng ◽  
刘凯 Liu Kai ◽  
贺文婷 He Wenting ◽  
李晨辉 Li Chenhui ◽  
魏青松 Wei Qingsong
Keyword(s):  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Isostatic Pressing

Densification of Alumina Components Via Indirect Selective Laser Sintering Combined with Isostatic Pressing

Applied laser ◽  
2013 ◽  
Vol 33 (1) ◽  
pp. 1-6
Author(s):  
史玉升 Shi Yusheng ◽  
刘凯 Liu Kai ◽  
贺文婷 He Wenting ◽  
李晨辉 Li Chenhui ◽  
魏青松 Wei Qingsong
Keyword(s):  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Isostatic Pressing

Control-Oriented Modeling and Repetitive Control in In-Layer and Cross-Layer Thermal Interactions in Selective Laser Sintering

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Dan Wang ◽  
Tianyu Jiang ◽  
Xu Chen
Keyword(s):  
High Performance ◽  
Selective Laser Sintering ◽  
Repetitive Control ◽  
Three Dimensional ◽  
Process Variations ◽  
Laser Sintering ◽  
Laser Source ◽  
Cross Layer ◽  
Modeling And Control ◽  
Melt Pool

Abstract Although laser-based additive manufacturing (AM) has enabled unprecedented fabrication of complex parts directly from digital models, broader adoption of the technology remains challenged by insufficient reliability and in-process variations. In pursuit of assuring quality in the selective laser sintering (SLS) AM, this paper builds a modeling and control framework of the key thermodynamic interactions between the laser source and the materials to be processed. First, we develop a three-dimensional finite element simulation to understand the important features of the melt pool evolution for designing sensing and feedback algorithms. We explore how the temperature field is affected by hatch spacing and thermal properties that are temperature-dependent. Based on high-performance computer simulation and experimentation, we then validate the existence and effect of periodic disturbances induced by the repetitive in- and cross-layer thermomechanical interactions. From there, we identify the system model from the laser power to the melt pool width and build a repetitive control algorithm to greatly attenuate variations of the melt pool geometry.

APPLICATION AND PERFORMANCE EVALUATION FOR THE DMS SYSTEM IN THE SLS PROCESS

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1833-1838 ◽  
Author(s):  
DONG SOO KIM ◽  
SUNG WOO BAE ◽  
KYUNG HYUN CHOI
Keyword(s):  
Processing Time ◽  
Solid Freeform Fabrication ◽  
Selective Laser Sintering ◽  
Spot Size ◽  
Laser Sintering ◽  
Processing Efficiency ◽  
Freeform Fabrication ◽  
Beam Expander ◽  
Scan Path ◽  
And Performance

A Solid Freeform Fabrication (SFF) system using Selective Laser Sintering (SLS) is currently recognized as a leading process and SLS extends the applications to machinery and automobiles due to the various materials employed. Especially, accuracy and processing time are very important factors when the desired shape is fabricated with Selective Laser Sintering (SLS), one of Solid Freeform Fabrication (SFF) system. In the convectional SLS process, laser spot size is fixed during laser exposing on the sliced figure. Therefore, it is difficult to accuracy and rapidly fabricates the desired shape. In this paper, to deal with those problems a SFF system having ability of changing spot size is developed. The system provides high accuracy and optimal processing time. Specifically, a variable beam expander is employed to adjust spot size for different figures on a sliced shape. Therefore, design and performance estimation of the SFF system employing a variable beam expander are achieved and the mechanism will be addressed to measure the real spot size generated from the variable beam expander. Also, the reduction of total processing time is an important issue in SFF system. A digital mirror system (DMS) is a system which scans the laser beam with different spot size. The spot size is selected based on the slicing section to decrease and accuracy of the process time and improve the processing efficiency. In this study, the optimal scan path generation for DMS will be addressed, and this development will improve the whole processing efficiency and accuracy through the scan efficiency by considering the existing scan path algorithm and heat energy distribution.

Isostatic pressing assisted indirect selective laser sintering of alumina components

2012 ◽  
Vol 18 (5) ◽  
pp. 409-419 ◽  
Author(s):  
J. Deckers ◽  
K. Shahzad ◽  
J. Vleugels ◽  
J.P. Kruth
Keyword(s):  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Isostatic Pressing
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