研究了Mn-Mo-B-RE系低合金铸钢中硼的偏析和在均匀化、正火、调质热处理过程中硼分布的变化,以及含硼量、稀土元素加入和钢中Mo等合金元素对硼分布的影响.硼在铸钢中有明显的偏析倾向,并随含硼量的增加而加剧;经通常的均匀化处理后,铸钢中硼分布的均匀性受Mo偏析的强烈影响.在特定的条件下,会产生沿奥氏体一定结晶学平面的硼相析出,或沿晶界形成粗大连续网状的硼相,导致脆断.试验还显示稀土元素有保护硼的良好作用.
The segregation and distribution of boron varied with heat-treatment in Mn-Mo-B-RE low alloy cast steels has been investigated. The influence of boron con-tent, rare earth additions and other alloying elements such as Mo upon the distri-bution of boron has been studied. It was shown that the boron segregation inthese steels is aggravated with the increase of its content. After norma1 homogeni-zation, the homogeneity of boron may be strongly affected by the segregation ofMo. In certain condition, the boron-bearing phases may precipitate either alongcertain austenite planes or at the grain boundaries to form coarse continuous networks, thus cause brittle fracture. The results also showed that rare earth elementsmay act as a fairly good protective additions for boron.
参考文献
| [1] | 贺信莱,褚幼义,张秀林,余宗森,李秋萍,尹熙光,金属学报,13(1977) ,235． |
| [2] | Wilson, W. G., Elec. Furnace Conf. Proc., 31 (1973) , 154．p |
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