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Research Papers

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

[+] Author and Article Information
Z. L. Lu

State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiao Tong University, Xi’an 710049, China723LZL@163.com

J. H. Liu

 Heilongjiang University of Science and Technology, Harbin 150027, China

Y. S. Shi1

State Key Laboratory of Material Processing and Die and Mould Technology, HUST, Wuhan 430074, China

1

Corresponding author.

J. Manuf. Sci. Eng 131(4), 041018 (Jul 16, 2009) (6 pages) doi:10.1115/1.3168444 History: Received October 30, 2008; Revised June 05, 2009; Published July 16, 2009

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 1D=(1D0)ekP 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 1wt% to 3wt%. 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 3wt%.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Relationship between microhardness and relative density of cold isostatic pressed specimens

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Figure 2

Micrographs of AISI304 specimens cold isostatic pressed at different pressures: (a)–(f) imply 200 MPa, 300 MPa, 400 MPa, 500 MPa, 600 MPa, and 650 MPa, respectively

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Figure 3

Fe–Cu phase diagram (part) (9)

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Figure 4

Micrographs of AISI304 specimens with different Cu contents in HIP

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Figure 5

Micrographs of 3% Cu–AISI304 specimens in HIP

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Figure 6

XRD of Cu–AISI304 specimens in HIP

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Figure 7

Zoom drawings of the first, second, and third diffraction peaks in Fig. 6

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Figure 8

SEM and fracture patterns of 3% Cu–AISI304 specimens in HIP

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Figure 9

Fracture patterns of AISI304 specimens with different Cu contents in HIP (a) 1% Cu–AISI304, (b) 2% Cu–AISI304, and (c) 3% Cu–AISI304

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Figure 10

SLS and SLS/IP parts of 3% Cu–AISI304

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