Influence of Re-Ti modification on the high impact wear resistance of high Si bainitic cast steel |
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| Authors: | Jin-feng Huang Hong-sheng Fang Yan-kang Zheng |
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| Affiliation: | (1) School of Materials Science and Engineering, Beijing University of Technology, No. 100 of Pingle Garden, Chaoyang District, Beijing, 100124, People’s Republic of China;(2) School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an, 710049, Shaanxi Province, People’s Republic of China |
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| Abstract: | The effect of rare earth (Re) and titanium (Ti) multi-modification on the impact wear behavior of Mn-B high-Si bainitic cast
steel was investigated systematically. The experiments show that the impact wear resistance can be improved greatly with the
addition of Re and Ti. Its wear loss is only about 1/3-1/2 as large as that of the unmodified bainitic cast steel. By the
Re/Ti modification, coarse dendrite grains and bainitic/martensite duplex structure have been refined effectively, and the
impact toughness of the bainitic cast steel is nearly tripled (10 mm×10 mm×55 mm, with unnotched sample). Consequently, the
modified bainitic cast steel possesses good wear resistance under high impact. For both modified and unmodified bainitic cast
steels, high hardness white layer and deformed zone are developed beneath the worn surface under the high impact wear, but
the formation and propagation of cracks are different for these bainitic casting steels. Different models for the formation
and propagation of cracks for both modified and unmodified bainitic cast steels under high impact wear are proposed. |
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