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| Morphology and.distribution of.precipitates and.their eff ects on.compression cracks in.Fe-6.5Si-0.02B electrical steel |
| Zhi-hao Zhang1 �� Jun-li Wang 2 �� Hua-dong .Fu1 |
1 Institute for Advanced Materials and Technology , University of Science and Technology Beijing , Beijing 100083 , China
2 Beijing Amorphous Energy Conservation Materials Industry Alliance , Beijing 100081 , China |
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Abstract Morphology and distribution of precipitates in the Fe-6.5Si-0.02B alloy were characterized, and these e.ects on room-temperature compression cracks were investigated. The results showed that the precipitate in the Fe-6.5Si-0.02B alloy is Fe2B with body-centered tetragonal structure, and its nano-hardness is 15.0.GPa which is higher than that of the matrix (~.8.5.GPa). In the as-cast alloys, most of the intragranular precipitates are coarse lath-like with the length of 5�C15.��m and width of 2�C5.��m, and the precipitates formed at the grain boundaries are of about 2�C3.��m in width. After oil quenching followed by heat treatment at 1100.��C for more than 30.min, the precipitates inside grains are re.ned with a size of several hundred nanometers and the precipitates at the grain boundaries are re.ned with a size of <.1.��m. After compression test, transgranular and intergranular cracks occur in the as-cast alloys with coarse precipitates. For the quenched alloys with .ne precipitates, the number of cracks decreases signi.cantly, and no transgranular cracks happen because some cracks are blocked or the propagation direction is changed by grain boundary.
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Received: 05 June 2017
Published: 15 May 2018
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2018, Vol. 25 
