M50NiL高温渗碳轴承钢中Fe2Mo析出相的电镜观察

摘要

The morphology, structure of Fe2Mo and its orientation relationship with martensite in M50NiL high temperature bearing steel were observed by high resolution electron microscopy ( HREM). The results show that there is plate martensite in cementite surface layer,and lath martensite in the center of bearing steel M50NiL. A little of twin martensite is observed in the cementite surface layer, and the twin plane is martensitic {112} crystal plane. Precipitates Fe2Mo with width of 2 - 3nm were observed in experimental steel, and grown along the twin plane between martensite bars, the width direction is perpendicular to the twin plane and the length direction parallel to the twin plane; the orientation relationship between the nano-precipitates Fe2Mo and twin martensite is {112}M//{001}Fe2Mo , [111]M//[100]Fe2Mo%应用高分辨电子显微镜(HREM)观察M50NiL高温渗碳轴承钢中的马氏体和强化相Fe2Mo的形貌、结构及其与马氏体的取向关系.分析结果表明:M50NiL高温渗碳轴承钢心部组织主要为板条马氏体,表层组织主要为片状马氏体,其亚结构孪晶的孪生面为{211}晶面族；M50NiL钢中观察到纳米级强化相Fe2Mo,长条状,宽约2～3nm;部分Fe2Mo沿马氏体的孪生面生长,生长方向为[111]M；纳米级强化相Fe2Mo与马氏体的取向关系为:{112}M∥{001}Fe2Mo,[111]M∥[100]Fe2Mo.