硼白口铸铁的研究进展

State of Art on Boron White Cast Iron

白口铸铁的合金化主宰了其发展进程。介绍了硼合金化白口铸铁的研究状况,主要阐述了硼对以碳化物为耐磨相和以硼化物为耐磨相的白口铸铁中组织和性能的影响。硼不改变以碳化物为耐磨相的白口铸铁中碳化物的形态,但能提高碳化物硬度和基体的淬透性,对韧性没有明显改善。以硼化物为耐磨相的白口铸铁组织中含有硬的硼化物耐磨相和强韧的马氏体基体,具有良好的硬度和韧性组合,是一类非常具有前途的新型白口铸铁。

Alloying plays a great role in the development of white cast iron. In this paper, the research status of boron white cast iron is reviewed. The effects of boron on the microstructure and properties of white cast iron either with carbides or with borides as wear-resistant phase are discussed mainly. For the former, boron does not change the morphology of carbides, but increases the hardness of carbides and the hardenability of matrix, otherwise, the toughness is almost the same. For the latter, hard boride and strengthening and toughening martensitic matrix in microstructure make it possess good balance of hardness and toughness, so it is a kind of new promising white cast iron.