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 楊棟賢02

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The study of brasion under different carbide particle size in high chromium white cast iron

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Dong-Shyen Yang

Keywords： unidirectional solidification,temperature gradient,microstructure,carbide,abrasion

Abstract：The study of abrasion under different carbide particle size in high chromium white cast iron.Circulated water chilling provided a unidirectional solidification process has been used in this research to study the effect of cooling rate and temperature gradient on the microstructure of HCWCI.A step-block with three thicknesses was used to study the effect of thickness on directional solidification.It shows that the cooling rate in three steps reached 14.5,6.68 and 5.23℃/sec respectively,comparing a much slow cooling rate in sand mold,0.25℃/sec.The carbide sizes solidified in these steps are 0.35,1.30,and 3.21μm respectively.For 12 mm step,the hardness in 1-5 mm depth reaches HRc 60.Use pin-on-disc wear test.The show,16mg/Km until 46.25/km different 2.89time,the effect of abrasive under carbide particle size.

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