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Korean Journal of Metals and Materials > Volume 56(5); 2018 > Article
Korean Journal of Metals and Materials 2018;56(5): 342-349. doi: https://doi.org/10.3365/KJMM.2018.56.5.342
Powder Injection Molding 공정으로 제조된 17-4PH 강과 Fe-Cr-B 합금 복합 소재의 미세조직 및 기계적 특성
주연아1, 김영균1, 윤태식2, 이기안1
1인하대학교 신소재공학과
2베스너(주)
Microstructure and Mechanical Properties of 17-4PH Steel and Fe-Cr-B Alloy Mixed Material Manufactured Using Powder Injection Molding
Yeun-Ah Joo1, 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: 19 February 2018;  Accepted: 16 March 2018.  Published online: 8 May 2018.
ABSTRACT
This study investigated the microstructure and mechanical properties of 17-4PH precipitation hardened martensite stainless steel and Fe-Cr-B based alloy mixed material manufactured using powder injection molding. 17-4PH stainless steel powder was mixed with 5 wt%, 10 wt% and 20 wt% Fe-Cr-B based alloy (M alloy) powder to manufacture three different PIM mixed materials. Initial microstructural observations confirmed the δ-ferrite phase and martensite phase in the matrix region in all three PIM mixed materials, and (Cr, Fe)2B phase was found in the strengthening phase, boride region. Room temperature tensile tests determined the yield strengths of the 5 wt%, 10 wt% and 20 wt% M added mixed materials to be 568.2 MPa, 674.0 MPa and 697.7 MPa, and the ultimate tensile strengths to be 1141.5 MPa, 1161.0 MPa and 1164.6 MPa, respectively. Fracture surface observation confirmed ductile fracture in the ferrite phases, and brittle fracture in the martensite phase and (Cr, Fe)2B phase. Also, as the M powder fraction increased, the fracture mode of the (Cr, Fe)2B phase was confirmed to shift from intra-phase fracture to inter-phase fracture. Based on the above-mentioned findings, the deformation and fracture behavior of new mixed materials manufactured using powder injection molding was identified, and its application possibilities were also discussed.
Keywords: 17-4PH, Fe-Cr-B, powder injection molding, mixed material, tensile property
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