|
NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR) >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Engineering and Materials Sciences (IJEMS) >
IJEMS Vol.17 [2010] >
IJEMS Vol.17(1) [February 2010] >
| Title: | Investigation into the densification of AISI304 parts fabricated by hybrid powder metallurgy techniques |
| Authors: | Lu, Z L
Liu, J H
Shi, Y S
Li, D C |
| Keywords: | Powder metallurgy
Selective laser sintering
Isostatic pressing
Relative density |
| Issue Date: | Feb-2010 |
| Publisher: | CSIR |
| Abstract: | Complex and high-performance parts of metal
and ceramics can be fabricated by selective laser sintering/isostatic pressing
(SLS/IP), in which cold isostatic pressing (CIPing) is introduced into SLS
followed by high sintering (HSing) and hot isostatic pressing (HIPing). In this
paper, the mechanisms of action of CIPing pressure and HSing temperature on
relative densities of AISI304 parts fabricated by SLS/IP are respectively
investigated. Based on the liquid sintering theory, the effects of trace FeB on
their relative densities, metallurgical structures and mechanical performances
are likewise analyzed. Results show that there is a minimal threshold of CIPing
pressure for AISI304 parts in the process of SLS/IP, which is about 400 MPa.
Their relative densities approximates certain value with an increase of HSing
temperature from 1250°C to 1350°C, which are improved while their mechanical
performances worsen with an increase of FeB content from 0.5% to 5.0%, and
their metallurgical structures consist of eutectic (α-Fe, Fe2B) and (Ni,Ni3B) besides austenite
(Fe,Cr,Ni,C). Although their strengths are better when FeB content is 0.5wt%,
their elongation percentages are lower, which is only about 8%. |
| Page(s): | 49-55 |
| ISSN: | 0975-1017 (Online); 0971-4588 (Print) |
| Source: | IJEMS Vol.17(1) [February 2010]
|
|
