High Temperature Mechanical Properties of IN 713C Alloy Fabricated by Metal Injection Molding Process

We fabricated the IN 7130 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 gamma, gamma' 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 degrees C. 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 degrees C than those of cast IN 7130 alloys. Above 700 degrees C, 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 propagated along the inter-particle region where oxides were observed regardless of deformation temperatures.