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논문 기본 정보

자료유형
학술저널
저자정보
M. Jafari (Islamic Azad University) M. Rafiei (Islamic Azad University) H. Mostaan (Arak University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.26 No.10
발행연도
2020.1
수록면
1,533 - 1,544 (12page)

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초록· 키워드

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In this investigation, the microstructure and mechanical properties of AISI420/SAF2507 dissimilar joint produced by TLPprocess were investigated at different bonding times. For this purpose, TLP process was carried out in a vacuum furnace at1050 °C using BNi-2 interlayer. The microstructure of different areas of the joint was evaluated by optical microscopy, scanningelectron microscopy and energy dispersive spectroscopy. Also, the mechanical properties of the bonded samples werestudied using microhardness and shear-tensile tests. It was found that isothermal solidification was completed after 60 minof bonding time. The width of DAZ in SAF2507 steel side was greater than that of AISI420 steel side at all bonding timesowing to the easier volume diffusion of boron in to the fully austenitic structure of AISI420 steel as compared with dualcrystal structure of SAF2507 steel. At bonding time of 60 min, by regarding the more time for diffusion as compared with1 min, boride compounds dissolved in the base metals and were discontinued. Thus, the aggregation of boride compoundsdecreased and as a result the microhardness decreased. In fully isothermal solidification sample, due to the lack of eutecticand intermetallic compounds and creating a homogenous joint (γ-Ni phase), the strength increased. In fact, transformationof athermal solidification to isothermal solidification led to the increase of the joint strength.

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