含C、Cr、Mo的Fe-10Ni-14Co钢的微观组织

THE MICROSTRUCTURES OF Fe-10Ni-14Co STEELS CONTAINING C, Cr AND Mo

用TEM对两种含碳量的高钴镍钢的微观组织进行了研究。结果表明,各状态试样组织中孪晶的出现,淬火温度、冷却速度的影响是次要的,与合金中的合金元素镍、铬、铜有更密切的关系。淬火+510℃回火5小时组织中除在淬火过程中形成的薄膜状残余奥氏体外,还存在穿板条及沿板条的呈片状或颗粒状的逆转变奥氏体,组织中的合金碳化物鉴定为Mo_2C。

The microstructures of the steels containing two carbons contents have been investigated by means of TEM. The results show that, the presence of twinning martensite should be attributed to alloying elements addition in steel, and the austenitizing temperature, and cooling rate are not important factors. The alloy carbide found in 830℃ quenched and tempered at 510℃ conditions was indentified as Mo_2C. The orientation relatiorship between α and Mo_2C follows Pitsch—Schrader rule. Some pieces of reverted austinite in quenched and tempered(510℃ 5h) conditions were revealed.