Ni-25Cr-20Co合金时效组织结构及性能研究
发布时间：2018-10-18 11:55
【摘要】：在Thermo-Calc热力学软件模拟计算基础上,采用光学显微镜、扫描电子显微镜、能谱检测和透射电子显微镜研究了Ni-25Cr-20Co合金在长期时效过程中析出相的变化情况及对性能的影响,理论分析了γ′相颗粒粗化对合金拉伸变形过程中第二相与位错交互作用机制的影响。结果表明:经750℃时效后合金中析出MC、M_(23)C_6和γ′相,γ′相的体积分数约为16%。长期时效后,γ′相颗粒的平均尺寸与时间t符合LSW理论,受溶质原子扩散及γ/γ′界面能的影响。时效后合金的拉伸强度明显增加,随时效时间的延长,拉伸强度逐渐降低。随γ′相的粗化,拉伸变形过程中第二相与位错交互作用的机制由位错热攀移机制→位错切割机制→Orowan绕越机制转变为位错热攀移机制→Orowan绕越机制→位错切割机制。
[Abstract]:On the basis of Thermo-Calc thermodynamics software simulation, the changes of precipitated phases and their effects on the properties of Ni-25Cr-20Co alloys during long-term aging were studied by optical microscope, scanning electron microscope, energy spectrum detection and transmission electron microscope. The effect of 纬 'phase coarsening on the interaction between the second phase and dislocation during tensile deformation of the alloy was analyzed theoretically. The results show that MC,M_ _ (23) C _ (6) and 纬 'phase are precipitated from the alloy after aging at 750 鈩，
本文编号：2279049
[Abstract]:On the basis of Thermo-Calc thermodynamics software simulation, the changes of precipitated phases and their effects on the properties of Ni-25Cr-20Co alloys during long-term aging were studied by optical microscope, scanning electron microscope, energy spectrum detection and transmission electron microscope. The effect of 纬 'phase coarsening on the interaction between the second phase and dislocation during tensile deformation of the alloy was analyzed theoretically. The results show that MC,M_ _ (23) C _ (6) and 纬 'phase are precipitated from the alloy after aging at 750 鈩，
本文编号：2279049
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