ATI 718Plus高温合金微观组织与性能研究进展  

Reviews on the Study of Microstructure and Properties of ATI 718Plus Superalloy

作　　者：仉建波 李京桉 彭远祎 夏兴川[1,2] 刘畅 丁俭 陈学广[1] 刘永长[2] ZHANG Jianbo;LI Jing’an;PENG Yuanyi;XIA Xingchuan;LIU Chang;DING Jian;CHEN Xueguang;LIU Yongchang(School of Material Science and Engineering,Hebei University of Technology,Tianjin 300130,China;School of Material Science and Engineering,Tianjin University,Tianjin 300072,China)

机构地区：[1]河北工业大学材料科学与工程学院,天津300130 [2]天津大学材料科学与工程学院,天津300072

出　　处：《材料导报》2022年第4期149-156,共8页Materials Reports

基　　金：国家自然科学基金(52175312);河北省高层次人才资助项目(A201902008);河北省自然科学基金(E2019202161);新型钎焊材料与技术国家重点实验室基金(SKLABFMT201804)。

摘　　要：ATI 718Plus(以下简称718Plus)是一种基于IN718高温合金改进的时效强化型镍基变形高温合金,已广泛应用于航空发动机的热端零部件。合金最初以锻造态引入,随着航空航天领域对大型复杂零部件需求的提高,锻造态合金已不能满足实际要求,因此在锻造态合金的基础上通过提高Nb含量开发出了铸造718Plus合金,并对其微观组织、焊接性能和拉伸性能开展了研究。锻造态和铸造态合金的化学成分与成型工艺的差异导致其微观组织及性能不同,因此阐明两种合金微观组织与使役性能之间的内在联系具有重要意义。本文综述了近年来锻造态和铸造态718Plus合金的微观组织调控及性能研究进展,包括:元素含量与分布状态对合金微观组织的影响,热处理制度对γ′相及η相分布状态的影响,热变形工艺与合金微观组织的关系,并得到最优热加工参数,总结了服役环境对合金蠕变、疲劳、焊接及抗氧化性能的作用机制,最后分析了合金研究过程中存在的问题及发展趋势。ATI 718Plus(hereafter referred to as 718Plus)is an age-strengthened nickel-based wrought superalloy according to the improved IN718 superalloy,which has been widely used in hot end components for aero engines.The alloy originally introduced in the wrought state,as the demand for large and complex components in the aerospace sector increased,the wrought alloy could no longer meet the practical requirements,so the cast 718Plus alloy was developed by increasing the Nb content based on the wrought alloy and its microstructure,welding properties and tensile properties were investigated.The chemical composition and forming process of as-wrought and as-cast alloys lead to different microstructures and properties,and it is important to clarify the internal relationship between microstructure and properties of the two alloys.This paper reviews the progress of microstructure control and properties of the wrought and cast 718Plus alloys in recent years,including the influence of element contents and distribution state on the microstructure of the alloys,the function of heat treatment regime on the distribution state ofγ′andηphases,and the relationship between hot deformation process and the microstructure of the alloys.As a result,the optimum hot processing parameters are obtained,the mechanism of service environment on creep,fatigue,welding and oxidation resistance of alloy is summarized,and the problems and development trend in the process of alloy research are analyzed eventually.

关 键 词：718Plus合金 化学成分 热变形 热处理制度 加工性能 

分 类 号：TB31[一般工业技术—材料科学与工程] TG146.1[金属学及工艺—金属材料]