电子束层覆凝固制备难变形高温合金高均质铸坯的研究进展  

Research Progress on Preparation of Highly Homogeneous Cast Billets of Hard-to-deform Superalloys by Electron Beam Coating Solidification Technology

作　　者：谭毅[1] 王以霖 白如圣 李鹏廷[1] TAN Yi;WANG Yilin;BAI Rusheng;LI Pengting

机构地区：[1]大连理工大学材料科学与工程学院,辽宁大连116000

出　　处：《大型铸锻件》2024年第6期10-17,73,共9页Heavy Casting and Forging

基　　金：国家重点研发计划(2019YFA0703500电子束层凝制备超纯净高均质高温合金)。

摘　　要：变形高温合金因具有优异的高温强度、蠕变持久寿命和良好的组织稳定性被广泛用作航空发动机或燃气轮机中热端转动部件。近年来,随着两机朝着大型化、高推重比、大涵道比方向发展,对热端部件材料的性能要求不断增加。为了满足此需求,变形高温合金主要朝着高合金化、高γ′相体积分数、高含碳量方向发展。由此导致材料在制备过程中将面临着偏析严重、组织粗大、开坯困难等问题,这些问题导致材料具有较差的力学性能,严重扼制了难变形高温合金的发展。为了解决这些问题,提出了一种新型制备技术—电子束层覆凝固制备技术。该技术不仅能提高合金的纯净度和均质性,还能提升合金的热塑性。文章将对这一技术的实际应用进行简要介绍,以期为难变形高温合金的发展提供新的思路。Deformed superalloys are widely used in the rotating components of the hot sections of aerospace engines and gas turbines,due to their excellent high-temperature strength,creep resistance service life,and good microstructural stability.In recent years,as the two major types of machines have evolved towards larger sizes,higher thrust-to-weight ratios,and greater bypass ratios,the performance requirements for materials used in hot section components have increased significantly.To meet these demands,the wrought superalloys have primarily developed along the trends of higher alloying,increased volume fraction ofγ′phase,and higher carbon content.This has led to challenges during the preparation of these materials,including severe segregation,coarse microstructures,and difficulties in billet forming,which result in inferior mechanical properties and severely hinder the development of difficult-to-deform superalloys.To solve these issues,a novel preparation technology that is electron beam coating solidification technology is introduced.This technology not only enhances the purity and homogeneity of the alloy but also improves its thermoplasticity.In this paper,the practical applications of this technology will be introduced,aiming to offer new insights for the development of hard-to-deform superalloys.

关 键 词：难变形高温合金 电子束层覆凝固 偏析 开坯 GH4975 

分 类 号：TG132.32[一般工业技术—材料科学与工程]