Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Spark Plasma Sintering of Fe-Ni-Cu-Mo-C Low Alloy Steel Powder

  • Nguyen, Hong-Hai (School of Materials Science and Engineering, University of Ulsan) ;
  • Nguyen, Minh-Thuyet (School of Materials Science and Engineering, University of Ulsan) ;
  • Kim, Won Joo (School of Materials Science and Engineering, University of Ulsan) ;
  • Kim, Ho Yoon (School of Materials Science and Engineering, University of Ulsan) ;
  • Park, Sung Gye (Research Laboratory, Metal Tech Co., Ltd.) ;
  • Kim, Jin-Chun (School of Materials Science and Engineering, University of Ulsan)
  • Received : 2016.05.12
  • Accepted : 2015.06.16
  • Published : 2016.06.28
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Abstract

In this study, Fe-Cu-Ni-Mo-C low alloy steel powder is consolidated by spark plasma sintering (SPS) process. The internal structure and the surface fracture behavior are studied using field-emission scanning electron microscopy and optical microscopy techniques. The bulk samples are polished and etched in order to observe the internal structure. The sample sintered at $900^{\circ}C$ with holding time of 10 minutes achieves nearly full density of 98.9% while the density of the as-received conventionally sintered product is 90.3%. The fracture microstructures indicate that the sample prepared at $900^{\circ}C$ by the SPS process is hard to break out because of the presence of both grain boundaries and internal particle fractures. Moreover, the lamellar pearlite structure is also observed in this sample. The samples sintered at 1000 and $1100^{\circ}C$ exhibit a large number of tiny particles and pores due to the melting of Cu and aggregation of the alloy elements during the SPS process. The highest hardness value of 296.52 HV is observed for the sample sintered at $900^{\circ}C$ with holding time of 10 minutes.

Keywords

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