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合金中γ’相主要呈现两种沉淀方式,均匀弥散沉淀和沿位错沉淀。正常热处理后,γ’同奥氏体有简单共格关系。随着铌含量的增高,γ’相的密度(数量)增大。应力时效时,γ’继续在位错上沉淀、长大,使位错受到钉扎。在外应力作用下,位错切割通过γ’相。象尺寸为30nm时,γ’失去同奥氏体的共格关系,并产生界面位错,位错在γ’粒子间弯曲绕过的Orowan机制可能启动。
The γ ’phase in the alloy mainly presents two kinds of precipitation methods, uniform dispersion precipitation and precipitation along the dislocation. After normal heat treatment, γ ’has a simple coherent relationship with austenite. As the niobium content increases, the density (amount) of the γ ’phase increases. During stress aging, γ ’continues to precipitate on the dislocations and grow up, pinning the dislocations. Under external stress, the dislocation cuts through the γ ’phase. At the size of 30 nm, the γ ’’ loses the coherent relationship with austenite and generates interfacial dislocations, and the Orowan mechanism with dislocation bending around γ ’particles may start up.