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利用扫描电镜、透射电镜及力学性能测试方法,研究热连轧GH4169合金钢在不同时效温度下力学性能及微观组织的变化规律,揭示其变形机制。结果表明,时效处理可细化试验钢组织,晶粒细化至4~6μm,同时析出γ’和γ’’等弥散相;随着测试温度的升高,合金钢的抗拉强度和屈服强度降低,伸长率提高,其主要变形机制是位错控制的双向滑移和孪晶的多向变形,且随着形变的增加,合金钢晶界处因积塞萌生的裂纹数目随之增加直至断裂。
Using scanning electron microscopy, transmission electron microscopy and mechanical properties testing methods, the study of the mechanical properties and microstructure changes of GH4169 alloy steel at different aging temperatures were studied to reveal the deformation mechanism. The results show that the aging treatment can refine the microstructure of the test steel, the grain refinement to 4 ~ 6μm, while precipitated γ ’and γ’ ’and other dispersed phase; with the test temperature increases, the tensile strength and yield strength of the alloy steel Decrease and elongation increase. The main deformation mechanism is dislocation-controlled two-way slip and twins multi-directional deformation. With the increase of deformation, the number of cracks initiated by plugging in the grain boundaries increases fracture.