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Korean Journal of Metals and Materials > Volume 56(2); 2018 > Article
Korean Journal of Metals and Materials 2018;56(2): 121-129. doi: https://doi.org/10.3365/KJMM.2018.56.2.121
Metal Injection Molding 공정으로 제조된 Fe-Cr-Ni계 HK30 합금의 미세조직 및 상·고온 인장 특성에 미치는 열간 등압 성형의 영향
김영균1, 윤태식2, 이기안1
1인하대학교 신소재공학과
2베스너(주)
Effect of Hot Isostatic Pressing on the Microstructure and Room·High Temperature Tensile Properties of Fe-Cr-Ni based HK30 Alloy Manufactured by Metal Injection Molding Process
Young-Kyun Kim1, Tae-Sik Yoon2, Kee-Ahn Lee1
1Department of Materials Science and Engineering, Inha University, Incheon 22212, Republic of Korea
2Bestner Co., Eumseong, Chungcheogbuk-do 27623, Republic of Korea
Correspondence  Kee-Ahn Lee ,Tel: +82-32-860-7532, Email: keeahn@inha.ac.kr
Received: 21 August 2017;  Accepted: 16 November 2017.  Published online: 5 February 2018.
ABSTRACT
This study manufactured Fe-Cr-Ni-based alloy (HK30) using the metal injection molding (MIM) process and investigated the microstructure and room·high temperature mechanical properties of the material. The effect of hot isostatic pressing (HIP) on properties was also examined. The average grain sizes were 24.1 µm for an MIM specimen and 29.1 µm for an MIM+HIP specimen. Microstructure and phase analysis results confirmed that the matrix mainly consisted of γ-Fe, and Cr23C6 phase. To evaluate the mechanical properties of the material, tensile tests were performed at room temperature and 900 oC. The tensile tests at room temperature indicated that the MIM and MIMTHIP specimens showed tensile strength of 609.6 MPa and 645.0 MPa, and elongation of 32.7% and 43.7%, respectively. In both strength and elongation, the MIM+HIP sample had greater performance. The tensile results at 900 oC also showed that the HIP+MIM specimen had higher strength and elongation. This was attributed to fewer macro cracks, denser structures and finer distribution of Nb based carbide due to the additional HIP. This study also discussed the deformation behavior of MIM material at room·high temperatures.
Keywords: metal injection molding, Fe-Cr-Ni based alloy, hot isostatic pressing, microstructure, high temperature, mechanical properties
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