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Wu, Yixian; German, Randall M.; Blaine, Debby; Marx, Brian M.; Schlaefer, Connie

doi:10.1023/a:1016532418920

Cited by 74 publications

(49 citation statements)

References 6 publications

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“…However, it is present in very low amounts that are nearly impossible to visualize by optical microscopy. These constituents were already discussed in the literature by Wu et al 8,10 in their two studies.…”

Section: Materials Characterisation and Discussionmentioning

confidence: 73%

“…However, a systematic investigation on the corrosive properties of these materials is still necessary before any conclusion is drawn. Earlier studies have already shown that carbon has a noticeable effect on the density, microstructure, mechanical properties and corrosion resistance 8 . The densities of the sintered tensile specimens were high for both sintering routes and were nearly identical.…”

Section: Materials Characterisation and Discussionmentioning

confidence: 99%

“…Lower amounts of carbon increase the quantity of delta ferrite. Wu et al 8 and Sago et al 9 investigated the formation of delta ferrite during sintering at different temperatures and with different carbon contents. Both concluded that the sintering of 17-4PH stainless steel above more or less 1220 °C leads to the formation of delta ferrite in a continuous grain boundary morphology.…”

Section: Materials Characterisation and Discussionmentioning

confidence: 99%

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Plasma debinding and sintering of metal injection moulded 17-4PH stainless steel

et al. 2011

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In this work, 17-4PH stainless steel parts processed in a Plasma Assisted Debinding and Sintering (PADS) furnace were characterised in terms of microstructure, final density, microhardness, carbon content and tensile behaviour. To determine whether these properties were satisfactory, the same characterisation procedure was conducted on the parts processed by conventional batch furnaces that are normally employed in Metal Injection Moulding industrial plants. The properties were in good agreement, and only slight differences like an extremely low carbon content (0.003% w/o) were observed. It has been seen that not only economical advances but also intricate materials with suitable responses may be obtained using PADS.

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Section: Materials Characterisation and Discussionmentioning

confidence: 73%

Section: Materials Characterisation and Discussionmentioning

confidence: 99%

Section: Materials Characterisation and Discussionmentioning

confidence: 99%

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Plasma debinding and sintering of metal injection moulded 17-4PH stainless steel

et al. 2011

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“…10) In a similar study of PIM 17-4PH, Wu et al used gas atomized powders and removed binders at different temperatures to obtain different residual carbon contents after debinding, which resulted in carbon contents in as-sintered tensile bars between 0.05 mass% and 0.13 mass%. 16) They showed that the specimen with a 0.13 mass% carbon, which exceeds the maximum limit, had more martensite, less -ferrite, lower sintered density, higher tensile strength, and lower elongation.…”

Section: Introductionmentioning

confidence: 99%

“…12) The study of Wu et al 16) has provided a great deal of insight on the effect of carbon content on sintered properties, but the studies on the use of water atomized powders for 17-4PH compacts with carbon contents within the 0.07 mass% limit are still limited. Thus, the current study aims to correlate the amount of graphite addition with the reduction of silica, density, mechanical properties, and corrosion resistance of PIM 17-4PH compacts prepared with water atomized powders.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Mechanical Properties of Injection Molded 17-4PH Stainless Steel through Reduction of Silica Particles by Graphite Additions

2010

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Silica particles are often found in sintered 17-4PH stainless steels when water atomized powder is used. To eliminate the SiO 2 particles and to improve the mechanical properties and corrosion resistance, graphite powders were mixed in this study with 17-4PH powders and binders during the kneading step of the powder injection molding process. The measurements of carbon and oxygen contents in tensile specimens and microstructure observations confirm the reduction of silica particles by graphite powders during vacuum sintering. The optimum content of the graphite addition is 0.26 mass%, with which most SiO 2 particles are reduced and the final carbon and oxygen contents are 0.03 and 0.01 mass%, respectively. These changes of compositions decrease the amount of -ferrite in the as-sintered compact to 4 vol%, lower than the 10 vol% of the compact without any graphite additions. After solutioning and aging treatment, the hardness, tensile strength, and ductility are HRC 41, 1310 MPa, and 9.0%, respectively. These properties are better than the typical values of 17-4PH reported in the literature and the corrosion resistance remains similar to that without any graphite additions. The relevant mechanisms on the changes of these properties are discussed with a focus on the effects of graphite addition on the residual carbon content, fractions of -ferrite and martensite, silica amount, and density.

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