【摘要】 稀土复合添加剂能细化晶粒,增加淬火组织中板条马氏体比例,改善夹杂物形态、大小和分布;提高残余奥氏体数量,减缓奥氏体分解,使钢的临界淬透直径增加硬度保持在HRC50左右,冲击韧性、断裂韧性分别提高67%和34%,低温韧性大于60J/cm~2.生产应用表明,在非强烈冲击磨损条件下,使用寿命比高锰钢提高1~4倍.更多还原

【Abstract】 The role of the compound RE additive in a medium carbon wear-resistant cast steel was investigated. The compound RE additive was found to refines grains, increases proportion of dislocated martensite in quenching structure and improves shape, size and distribution of the inclusions. It was found that compound RE additive increased the amount of rasidual austenite, retarded transformation rate of austenite and increased critical hardening diameter of the steel. When adding RE compound additive in medium carbon wear-resistant cast steel, the hardness of about 50(HRC) was maintained, the impact toughness and fracture toughness were raised by 67% and 34% separately and low temperature toughness of more than 60 J/cm2 was obtained. The result of application showed that the service life of the medium-carbon cast steel used at nonviolent impact conditions was 1~4 times as long as that of Mn 13 steel.更多还原