论文部分内容阅读
Inconel 718高温合金广泛应用于航空、航天、电力和国防等领域中复杂金属结构构件的制造,其高温抗疲劳性能和蠕变持久强度与成形加工过程中微观组织的演变密切相关.以往的研究侧重于镍基合金热加工(如定向凝固、热处理、锻造和焊接等)工艺参数的优化,较少从析出相控制的角度来阐明冷轧、热变形、焊接等工艺与高温服役性能之间的内在联系.本文介绍了该合金中不同类型的析出相,包括:主要强化相(g’相)、辅助强化相(g’相)、g’相的平衡相(d相),以及MX型碳氮化物和Laves相;论述了镍基合金制备过程中不同类型析出相的析出机制及其对合金高温性能的影响;指出了镍基合金高能电子束焊接过程中,焊接热影响区微裂纹形成的影响因素.
Inconel 718 superalloy is widely used in the manufacture of complex metal structural components in aerospace, aerospace, electric power and national defense fields, and its high temperature fatigue resistance and long-term creep strength are closely related to the evolution of microstructure in the forming process. In the optimization of process parameters of Ni-based alloy in hot working (such as directional solidification, heat treatment, forging and welding), the intrinsic relationship between cold rolling, hot deformation, welding and other processes and high temperature service performance is seldom analyzed from the perspective of precipitation control This article describes the different types of precipitates in this alloy, including the major strengthening phase (g ’phase), the auxiliary strengthening phase (g’ phase), the equilibrium phase (d phase) of the g ’phase, And the Laves phase. The precipitation mechanism of different types of precipitated phases and their effect on the high temperature properties of the alloys during the preparation of nickel-base alloys are discussed. The influence of the formation of micro-cracks in the HAZ of the nickel-based alloys during high-energy electron beam welding factor.