新型不锈轴承钢6Cr14Mo冲击韧性与显微亚结构

Impact Toughness and Micro-Sub-Structure of a New Stainless Bearing Steel 6Cr14Mo

在同等硬度下 ,新型不锈轴承钢 6Cr14Mo(% :0 .6 4C ,13.6Cr ,0 .6 2Mo)的冲击韧性ak 比 9Cr18不锈轴承钢 (% :0 .94C ,18.6Cr)高 14～ 30J/cm2 。从碳化物电镜复型分析可见 ,6Cr14Mo钢淬、回火组织中主要为细小、弥散分布的二次碳化物 ,一次碳化物较少 ,而 9Cr18钢组织中一次碳化物较多。新型不锈轴承钢6Cr14Mo的基体组织为板条马氏体 ,并有少量残余奥氏体 ,组织中的碳化物主要为M2 3 C6以及弥散析出的Mo2 C和ε Fe2 C。

The impact toughness a k of new stainless bearing steel 6Cr14Mo (0.64C, 13.6Cr, 0.62Mo) is 14～30 J/cm2 higher than that of stainless bearing steel 9Cr18 (0.94C,18.6Cr) as both bearing steels are of same hardness. It was observed by electron microscopy carbide replica analysis, the dominant carbide in quenched-tempered structure of steel 6Cr14Mo was fine, dispersal secondary carbide with minor primary carbide, while there was considerable primary carbide in the structure of steel 9Cr18. The matrix structure of new stainless bearing steel 6Cr14Mo was lath martensite with minor residual austenite, and the main carbides in structure were M 23C 6 with dispersed deposited Mo 2C and ε-Fe 2C.