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한국열처리공학회> 열처리공학회지> Thixomolding 공정으로 제조된 Mg-xAl-yZn계 마그네슘 합금의 미세조직과 기계적 물성에 미치는 Ti 첨가 영향

KCI후보

Thixomolding 공정으로 제조된 Mg-xAl-yZn계 마그네슘 합금의 미세조직과 기계적 물성에 미치는 Ti 첨가 영향

Effects of Ti Addition on Microstructure and Mechanical Properties of Mg-xAl-yZn Magnesium Alloys by Thixomolding Process

박성현 ( Sung-hyun Park ) , 장호승 ( Ho-seung Jang ) , 이지호 ( Ji-ho Lee ) , 박노진 ( No-jin Park ) , 오명훈 ( Myung-hoon Oh )
  • : 한국열처리공학회
  • : 열처리공학회지 32권4호
  • : 연속간행물
  • : 2019년 07월
  • : 168-174(7pages)

DOI


목차

1. 서 론
2. 실험방법
3. 결과 및 고찰
4. 결 론
감사의 글
References

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The microstructural features and relative room temperature mechanical properties were investigated in various compositions of Mg-xAl-yZn alloys by thxiomolding process. The microstructure was composed of α-Mg particles and mixture of α-Mg and β-Mg17Al12 eutectic phase. The amount of β-Mg17Al12 eutectic phase in mixture was increased with increasing Al and Zn contents without grain refinement. After adding Ti content, however, the morphology of β-Mg17Al12 eutectic phase transformed from net-like to discontinuous shape and the average grain size reduced. To determine the relationship between microstructural features and their mechanical properties, a tensile test was performed at room temperature. As a result, it was found that the mechanical properties were improved in all of Ti contained alloys due to increased elongation and the mechanisms are discussed in terms of microstructural evolution.
(Received July 5, 2019; Revised July 16, 2019; Accepted July 25, 2019)

UCI(KEPA)

간행물정보

  • : 공학분야  > 금속공학
  • : KCI후보
  • :
  • : 격월
  • : 1225-1070
  • :
  • : 학술지
  • : 연속간행물
  • : 1988-2019
  • : 1417


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1보론 도핑 여부에 따른 DLC 박막의 레이저 가공 특성 변화 연구

저자 : 손예진 ( Ye-jin Son ) , 최지연 ( Ji-yeon Choi ) , 김태규 ( Tae-gyu Kim )

발행기관 : 한국열처리공학회 간행물 : 열처리공학회지 32권 4호 발행 연도 : 2019 페이지 : pp. 155-160 (6 pages)

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Diamond Like Carbon (DLC) is a metastable form of amorphous carbon that have superior material properties such as high mechanical hardness, chemical inertness, abrasion resistance, and biocompatibility. Furthermore, its material properties can be tuned by additional doping such as nitrogen or boron. However, either pure DLC or doped DLC show poor adhesion property that makes it difficult to apply contact processing technique. Therefore we propose ultrafast laser micromachining which is non-contact precision process without mechanical degradation. In this study, we developed precision machining process of DLC thin film using an ultrafast laser by investigating the process window in terms of laser fluence and laser wavelength. We have also demonstrated various patterns on the film without generating any microcracks and debris.
(Received July 3, 2019; Revised July 12, 2019; Accepted July 22, 2019)

2베이나이트 함유 비조질강의 충격인성 및 파괴거동

저자 : 조기섭 ( Ki-sub Cho ) , 권훈 ( Hoon Kwon )

발행기관 : 한국열처리공학회 간행물 : 열처리공학회지 32권 4호 발행 연도 : 2019 페이지 : pp. 161-167 (7 pages)

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Impact toughness and fracture behavior were studied in five kinds of non-heat treating steels containing bainite; standard(0.25C-1.5Mn-0.5Cr-0.2Mo-0.15V), high V(0.3V), Ni(0.5Mn-2Ni), W(0.4W instead of Mo), and high C-Ni(0.35C-0.5Mn-2Ni) steels. The good hardness and impact toughness balance was exhibited in the 1100℃-rolled condition, while the impact toughness was deteriorated due to coarse grained microstructure in the 1200℃-rolled condition. The impact toughness decreased with increasing the hardness in all steels studied. The fracture behavior was also basically identical, that is, the fracture area was divided into 3 zones; shear and fibrous zone, fracture transition zone with ductile dimples and cleavage cracks, where the cracks initiate and grow to critical size, unstable cleavage fracture propagation zone. The energy absorbed for the critical crack formation through the plastic deformation inside the plastic zone in front of the notch root contributed to a mostly significant portion of the total impact energy.
(Received July 5, 2019; Revised July 15, 2019; Accepted July 24, 2019)

3Thixomolding 공정으로 제조된 Mg-xAl-yZn계 마그네슘 합금의 미세조직과 기계적 물성에 미치는 Ti 첨가 영향

저자 : 박성현 ( Sung-hyun Park ) , 장호승 ( Ho-seung Jang ) , 이지호 ( Ji-ho Lee ) , 박노진 ( No-jin Park ) , 오명훈 ( Myung-hoon Oh )

발행기관 : 한국열처리공학회 간행물 : 열처리공학회지 32권 4호 발행 연도 : 2019 페이지 : pp. 168-174 (7 pages)

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The microstructural features and relative room temperature mechanical properties were investigated in various compositions of Mg-xAl-yZn alloys by thxiomolding process. The microstructure was composed of α-Mg particles and mixture of α-Mg and β-Mg17Al12 eutectic phase. The amount of β-Mg17Al12 eutectic phase in mixture was increased with increasing Al and Zn contents without grain refinement. After adding Ti content, however, the morphology of β-Mg17Al12 eutectic phase transformed from net-like to discontinuous shape and the average grain size reduced. To determine the relationship between microstructural features and their mechanical properties, a tensile test was performed at room temperature. As a result, it was found that the mechanical properties were improved in all of Ti contained alloys due to increased elongation and the mechanisms are discussed in terms of microstructural evolution.
(Received July 5, 2019; Revised July 16, 2019; Accepted July 25, 2019)

4제 6 장 계산 소프트의 활용 예

저자 : 손명진

발행기관 : 한국열처리공학회 간행물 : 열처리공학회지 32권 4호 발행 연도 : 2019 페이지 : pp. 175-182 (8 pages)

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5열처리 용어 해설(10)

저자 : 한국열처리공학회

발행기관 : 한국열처리공학회 간행물 : 열처리공학회지 32권 4호 발행 연도 : 2019 페이지 : pp. 183-185 (3 pages)

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