Inconel718高温合金中析出相演变研究进展

发布时间：2018-01-07 13:19

本文关键词：Inconel718高温合金中析出相演变研究进展　出处：《金属学报》2016年10期 　论文类型：期刊论文

【摘要】：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.
[Abstract]:Inconel 718 superalloy is widely used in the manufacture of complex metal structures in the fields of aviation, aerospace, power and national defense. Its high temperature fatigue resistance and creep rupture strength are closely related to the evolution of microstructure during the forming process. Previous studies have focused on the hot processing of nickel based alloys (such as directional solidification and heat treatment). The optimization of technological parameters such as forging and welding is seldom explained from the angle of precipitation phase control to clarify cold rolling and hot deformation. This paper introduces different types of precipitated phases in the alloy, including: main strengthening phase / g 'phase, auxiliary strengthening phase / g' phase). The equilibrium phase of g 'phase is D phase, and the MX-type carbonitride and Laves phase; The precipitation mechanism of different types of precipitated phases and its influence on the high temperature properties of Ni-base alloys were discussed. The factors influencing the formation of microcracks in the heat affected zone during high energy electron beam welding of nickel base alloys are pointed out.
【作者单位】：天津大学材料科学与工程学院水利安全与仿真国家重点实验室;
【基金】：国家高技术研究发展计划项目2015AA042504 国家自然科学基金面上项目51474156 国家杰出青年科学基金项目51325401资助~~
【分类号】：TG132.3
【正文快照】： 高温合金是当今航空、航天、电力和国防等领域的关键金属结构材料,广泛应用于涡轮盘、叶片、螺栓、导向器、压气机盘、机匣等各种重要零件的制作.近年来,研究人员围绕高温合金成分设计与纯净化处理[1~3]、热处理组织控制原理[4~6]、定向凝固单晶制备技术[7,8]、高温蠕变行为[9

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