摘要
合金晶界和晶内的主要存在相为粒状和小块状M_6C和MC型碳化物及大都与基体保持共格关系的尺寸约为88nm的球形γ′相。测定了它们的化学组成,发现M_6C大都为A_3B_3C,MC中含有较高的钛,M_6C中含有较高的钼,γ′中钛含量较低,但含有一定的钨量。合金的高温强化机制为;γ′相周围的较高应力场对位错运动的阻碍和γ′的较高反相畴界能使超点阵位错难于切割通过;数量较多的M_6C和MC的有效高温强化。
The principal precipitates at boundary and inside of grains in the alloy tested are to be Carbides M_6C, MC, and γ' phase, most of which keep up a simple coherent relationship with austenite matrix. The carbides M_6C are to be A_3B_3C with higher Mo content;the carbides MC are Ti-enriched phases; the γ' phases contain a small amount of Ti and certain W. The dislocation motion is prevented by strong stress field around γ' and the superdislocation hardly cut up and pass through the γ' with higher energy at antiphase domain boundary. A considerable number of M_6C and MC are available for effective strengthening at elevated temperatute.
出处
《特殊钢》
北大核心
1993年第5期19-23,共5页
Special Steel
