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RISS 인기검색어
- 검색키워드
- 저자 : Hsuan-Han Lai (검색결과 2 건)
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Hsuan-Han Lai,Chih-Chun Hsieh,Chi-Ming Lin,Weite Wu 대한금속·재료학회 2016 METALS AND MATERIALS International Vol.22 No.1
In this study, the effects of vanadium on the morphology and wear behavior of a eutectic Cr-Fe-C hardfacing alloy were discussed. The alloys tested contained different amounts of vanadium, ranging from 0 to 2.39 wt%. A fibrous V4C3 was found when the alloy contained 0.93 wt% vanadium. The addition of vanadium was found to decrease the fraction of eutectic M23C6 and increase the width of the interspaces between the eutectic cells. The DTA results revealed that V4C3 formed just before the eutectic α+M23C6 during solidification. The surface hardness was shown to increase with increasing vanadium content, which also caused the hardness deviation and wear loss to decrease; however, the addition of vanadium was not shown to affect the hardness of eutectic α+M23C6. The V4C3 could be scratched off during the wear test due to the increase in the width of the interspaces between the eutectic cells; therefore, the alloys that contained 0.93 and 2.39 wt% vanadium exhibited similar wear loss results.
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Lattice Relations and Solidification of the Complex Regular Eutectic (Cr,Fe)-(Cr,Fe)23C6
Hsuan-Han Lai,Chih-Chun Hsieh,Chi-Ming Lin,Weite Wu 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.3
The eutectic (Cr,Fe)-(Cr,Fe)23C6 showed a triaxial fishbone structure and could be categorized as a “complexregular structure”. In this study, the lattice relations of the fishbone (Cr,Fe)23C6 were examined and the solidificationprocess was observed using a transmission electron microscope and a confocal laser scanning microscope. Forone of the three fish bones in a eutectic cell, parallel (Cr,Fe)23C6 lamellas at one side of the spine had the samelattice direction, as did those in the (Cr,Fe) phase. The lattices of neighboring (Cr,Fe)23C6 and (Cr,Fe) phases werenot coherent. Lamellar (Cr,Fe)23C6 on opposite sides of a spine had different lattice directions, and their latticeboundary was in the spine. By using the confocal laser scanning microscope, the solidification of lamellar eutecticstructure could be observed. At the low cooling rate of 5oC·min-1, parallel lamellas would grow thick blocksinstead of thin plates. To obtain a thin lamellar eutectic structure, the cooling rate should be higher, likethe rate in welding.
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