【摘要】 研究了Mn Mo B RE系低合金铸钢中硼的偏析和均匀化、正火、调质热处理过程中硼分布的变化 ,以及稀土元素加入和钢中Mo等元素对硼分布的影响 .硼在铸钢中有明显的偏析现象 ,经正常的均匀化处理后 ,铸钢中硼分布的均匀性受Mo的偏析强烈影响 .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 ,会沿晶界形成粗大连续网状的硼相 ,导致脆断 .结果表明稀土元素可以抑制硼的偏析 ,从而起到保护硼的作用 .更多还原

【Abstract】 The segregation and distribution of Boron varied with heat treatment in Mn Mo B RE low alloy cast steels have been investigated. The influence of Boron content rare earth additions and other alloying elements such as Mo upon the distribution of Boron have been studied. After normal homogenization, the homogeneity of Boron may be strongly affected by the segregation of Mo. In certain condition, the Boron bearing phases may precipitate either along certain austenite planes or at the grain boundaries to form coarse continuous networks, thus cause brittle fracture. The results also showed that rare earth elements can restrain the segregation of Boron, and may act as a good protective additions for Boron.更多还原