Improving fracture toughness and hardness of Fe₂B in high boron white cast iron by chromium addition

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• 作者：Zhifu Huang ; Ji ; ong Xing ; Cheng Guo
• 刊名：Materials and Design
• 出版年：2010
• 出版时间：June 2010
• 年：2010
• 卷：31
• 期：6
• 页码：3084-3089
• 全文大小：811 K

文摘

The effect of chromium containing 0 % , 0.49 % , 1.02 % , 2.1 % , 3.2 % (in wt. % ) on the morphology, fracture toughness and micro-hardness property of Fe₂B in high boron white cast iron was investigated. The results indicated that, with an increase of chromium addition, the morphology of Fe₂B becomes larger and changes from the block to rod shape, its micro-hardness increases and the fracture toughness increases first and then decreases. Compared with the fracture toughness (3.8 MPa m^1/2) of Fe₂B without chromium addition, the toughness at 2.1 wt. % chromium addition can be improved by above one time, achieving 7.8 Mpa m^1/2, and the result was also qualitatively testified by the micro-cracks in Fe₂B based on scanning electron microscope micrographs.