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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술대회자료
- 저자정보
- 발행연도
- 2013.10
- 수록면
- 213 - 216 (4page)
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초록· 키워드
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This study investigated the effects of strain rate and orientation on the tensile deformation behavior of Ni-based bulk powder porous material. Powder porous materials were produced through PVD (physical vapor deposition), electroplating, and debinding & sintering processes and manufactured in bulk form [500 x 300 x 60(t) mm] through an additional process. The average pore size of the manufactured powder porous materials was of two types: one was around 1,200μm, and the other was 3,000μm. The result of microstructure observation showed that both porous materials were composed of γ–Ni, γ"-Ni3Al. To investigate the effect of strain rate and direction on the mechanical characteristics, test specimens were processed in two directions -- RD (rolling direction) and TD (transverse direction); and tensile tests were conducted with initial strain rates of 10-2/s, 10-3/s, and 10-4/s, respectively. They were machined into tensile test specimens with gauge length of 2mm, width of 15 mm, and thickness (t) of 10mm, and tests were conducted at room temperature using Instron 8801 instrument. The tensile test result showed that the RD tensile strength of the 1,200μm porous material ranged from 6.0 MPa (10-4/s) to 7.2 MPa (10-2/s), and TD tensile strength, from 4.2 MPa (10-4/s) to 4.8 MPa (10-2/s). the tensile strength of the 3,000μm porous material ranged from 3.0 MPa (10-4/s) to 3.3 MPa (10-2/s) for RD and from 1.5 MPa (10-4/s) to 2.1 MPa (10-2/s) for TD. Regardless of direction, the tensile strength of the bulk porous materials showed minor increase as the strain rate increased, and the tensile strength in RD was observed to be higher than the one in TD. Even though the porous material`s strength is generally explained through its correlation with relative density, authors tried to identify its correlation with porous materials by suggesting and using a new concept called area fraction. The observation of tensile fracture surface showed that the strut of porous materials was arranged/elongated in the direction of tension; rupture then occurred at the nodes where struts were interconnected. Such tensile deformation behavior was shown to be a unique phenomenon generated by the porous material`s porosity and pore structures and was different from the deformation behavior of general bulk materials. Based on these results, the micro-deformation mechanism of bulk-type powder porous materials was also discussed.
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UCI(KEPA) : I410-ECN-0101-2017-551-000831226