Three Mn-Cr-Mo bainite rail steels containing 0,0.009 and 0.015%La were prepared by the process of vacuum induction furn......

对空冷贝氏体钢５Ｃｒ３Ｍｏ２ＶＮｂ进行扩散退火，可减轻其晶内成分偏析，使组织均匀，强度与韧性明显提高，采用的扩散退火工艺对为１２５０℃×５ｈ，炉冷至室温，淬火，回......