Improving fracture toughness and hardness of Fe2B in high boron white cast iron by chromium addition
✍ Scribed by Zhifu Huang; Jiandong Xing; Cheng Guo
- Publisher
- Elsevier Science
- Year
- 2010
- Weight
- 811 KB
- Volume
- 31
- Category
- Article
- ISSN
- 0261-3069
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✦ Synopsis
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 Fe 2 B in high boron white cast iron was investigated. The results indicated that, with an increase of chromium addition, the morphology of Fe 2 B 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 Fe 2 B 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 Fe 2 B based on scanning electron microscope micrographs.