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Vol.52, No.5, 327 ~ 335, 2014
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| Title |
| High Temperature Mechanical Properties of IN 713C Alloy Fabricated by Metal Injection Molding Process |
| 심민철 Min Chul Shim , 김규식 Kyu Sik Kim , 조규상 Kyu Sang Cho , 김지식 Ji Sik Kim , 이기안 Kee Ahn Lee |
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| Abstract |
| We fabricated the IN 713C alloy by a metal injection molding (MIM) process and investigated the high temperature tensile properties. The microstructure of the MIMed IN 713C alloy mainly consisted of γ, γ′ and carbides. 0.98% (area fraction) of the pores was observed near the surface of the specimen, whereas 0.27% of the pores were located in the interior of the specimens. Tensile tests were conducted from room temperature to 900℃. The result of the tensile tests showed that this alloy had similar or somewhat higher strengths (YS: 734 MPa, UTS: 968 MPa, elongation: 7.16% at room temperature) from RT to 700℃ than those of cast IN 713C alloys. Above 700℃, however, strengths decreased rapidly with an increasing temperature (lower than those of cast IN 713C). The observation results of fractography revealed that the tensile fracture of the MIMed IN 713C alloy started near the surface defects and then the initial crack pro-pagated along the inter-particle region where oxides were observed regardless of deformation temperatures. |
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| Key Words |
| Alloys, Powder processing, High temperature, Mechanical properties, Tensile test |
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