The effect of boron and carbon contents on GFA, thermal properties, and cutting ability of Fe-base bulk amorphous steel (BAS)

• Main Authors: An-chun Xiao, 蕭安均
• Other Authors: Shian-ching Jang
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/59398488623034979169

碩士 === 國立中央大學 === 機械工程學系 === 101 === A prominent Fe-based bulk amorphous steel (BAS) alloy which present high glass forming ability (GFA), good corrosion resistance, superior mechanical properties and relative lower cost. The Fe41Cr15Co7Mo14C21-xBxY2 (x=5-10) BAS rods with a diameter of 2-4 mm, can be fabricate by suction casting method. The highest GFA value can be obtained by adjusting the ration of boron/carbon and reaches to the value of γ=0.399, γm=0.683 at the alloy composition of Fe41Ce15Co7Mo14C12B9Y2. Meanwhile, this alloy also presents very large supercooled liquid region up to 81 K which indicates that it also can be fabricated into the micro-surgery tool by thermoplastic forming. In addition, the hardness of the Fe-based BAS alloy exhibits saturated around 1200 Hv. The anodic polarization measurement of Fe-based BAS exhibits a higher corrosion resistance than the 304SS and 316SS in Hank’s balanced salt solution. Results of sharpness test reveal that BAS blade exhibits much lower surface roughness and higher wear resistance. The BSI value of Fe-based BAS blade, Fe-based MGTF blade and commercial blade increase from 0.26 to 0.38, 0.29 to 0.49 and 0.31to 0.59 after cutting length 50 cm, respectively.