Article(id=1249065614510330276, tenantId=1146029695717560320, journalId=1249024468962553931, issueId=1249065613306569569, articleNumber=null, orderNo=null, doi=10.11868/j.issn.1005-5053.2025.000080, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1746633600000, receivedDateStr=2025-05-08, revisedDate=null, revisedDateStr=null, acceptedDate=1749398400000, acceptedDateStr=2025-06-09, onlineDate=1775730049015, onlineDateStr=2026-04-09, pubDate=1759248000000, pubDateStr=2025-10-01, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1775730049015, onlineIssueDateStr=2026-04-09, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1775730049015, creator=13041195026, updateTime=1775730049015, updator=13041195026, issue=Issue{id=1249065613306569569, tenantId=1146029695717560320, journalId=1249024468962553931, year='2025', volume='45', issue='5', pageStart='1', pageEnd='182', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=1, specialIssue=null, createTime=1775730048728, creator=13041195026, updateTime=1775730148042, updator=13041195026, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1249066029947757306, tenantId=1146029695717560320, journalId=1249024468962553931, issueId=1249065613306569569, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1249066029951951611, tenantId=1146029695717560320, journalId=1249024468962553931, issueId=1249065613306569569, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=78, endPage=92, ext={EN=ArticleExt(id=1249065614728434087, articleId=1249065614510330276, tenantId=1146029695717560320, journalId=1249024468962553931, language=EN, title=Research progress in microstructure,defects and mechanical properties of IN718 superalloy thin wall fabricated by laser powder bed fusion, columnId=1249065614292231012, journalTitle=Journal of Aeronautical Materials, columnName=Review, runingTitle=null, highlight=null, articleAbstract=
IN718 superalloy is extensively utilized in the aerospace and nuclear industries due to its outstanding oxidation resistance, heat-corrosion resistance, good structural stability, fatigue performance and safety reliability. It is one of irreplaceable materials for the hot-end components of next-generation advanced aircraft engines. Recently, laser powder bed fusion(LPBF) technology has developed as an innovative rapid prototyping technique, transcending the limitations of traditional shaping methods and structural designs. This technology has realized one-step laser near-net shaping of complex thin-walled structures, demonstrating substantial application potential. However, during the laser additive manufacturing process, the thin-walled surfaces are exposed to high laser input energy, which can readily induce warping, deformation, and even cracking, significantly impacting the service performance of these structures. To address these challenges, this work provides an overview of the working principle and recent advancements in LPBF technologies. It systematically analyses the multi-scale microstructural evolution and precipitation phase behavior of IN718 superalloy thin wall fabricated by LPBF. Special emphasis is placed on the initiation, propagation mechanisms and mitigation strategies for metallurgical defects, including optimized thin-walled structural designs, laser forming process parameters and alloy composition. In addition, the strengthening mechanisms underlying the mechanical properties of IN718 superalloy thin wall at both room and high temperatures are analyzed and discussed. Finally, the work summarizes the existing challenges such as insufficient critical performance under harsh conditions and future development directions of superalloy thin wall fabricated by LPBF, including establishment of laser forming process databases specialized for superalloy thin wall, investigation of solidification defect formation and novel control strategies in superalloy thin wall fabricated by LPBF, and optimization of the chemical composition design for high-performance superalloy thin-walled components.
, correspAuthors=Haijun SU, authorNote=null, correspAuthorsNote=null, copyrightStatement=Copyright ©2025 Journal of Aeronautical Materials. All rights reserved., copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, authorCompany=null, fund=null, authors=null, authorsList=Peixin YANG, Haijun SU, Yinuo GUO, Chuanteng HUO, Wenbo ZHOU, Mingdie HE, Wenchao YANG, Lin LIU), CN=ArticleExt(id=1249065617836413420, articleId=1249065614510330276, tenantId=1146029695717560320, journalId=1249024468962553931, language=CN, title=激光粉末床熔融成形IN718高温合金薄壁组织、缺陷及力学性能研究进展, columnId=1249065614468391782, journalTitle=航空材料学报, columnName=综述, runingTitle=null, highlight=null, articleAbstract=
IN718高温合金因其优异的抗氧化性和抗热腐蚀性、良好的疲劳性能、组织稳定性及安全可靠性等综合性能,广泛应用于航空航天、核工业等领域,是新一代先进航空发动机热端构件不可替代的材料之一。激光粉末床熔融(laser powder bed fusion,LPBF)技术作为近年来发展迅速的新型快速成形技术,突破传统成形技术和结构设计束缚,实现复杂薄壁构件的一步激光近净成形,展现出广阔的应用前景。然而在激光增材制造成形过程中,薄壁表面的激光输入能量较大,易出现翘曲变形和裂纹,严重影响其服役性能。针对以上问题,本工作概述LPBF技术的工作原理及研究动态,系统分析LPBF成形IN718高温合金薄壁的跨尺度微观组织演化特征及析出相演变行为,重点梳理缺陷萌生和扩展机制,从优化结构设计、激光成形工艺参数、合金成分等多方面对缺陷抑制进行归纳,分析探讨IN718高温合金薄壁室温与高温力学性能的强化机制。最后,总结LPBF成形高温合金薄壁存在严苛环境下关键性能不足等问题并展望未来发展方向,其中包括:建立适合高温合金薄壁的激光成形工艺数据库;研究LPBF成形高温合金薄壁凝固缺陷形成及调控新方法;优化高性能高温合金薄壁构件材料化学成分。
, correspAuthors=苏海军, authorNote=null, correspAuthorsNote=
苏海军(1981—),男,博士,教授,研究方向为先进定向凝固技术与理论及新材料,联系地址:陕西省西安市碑林区友谊西路127号西北工业大学(710072),E-mail:
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2Research & Development Institute,Northwestern Polytechnical University,Shenzhen 518057,Guangdong,China), AuthorCompanyExt(id=1249065618197123586, tenantId=1146029695717560320, journalId=1249024468962553931, articleId=1249065614510330276, companyId=1249065618180346368, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
2西北工业大学 深圳研究院,广东 深圳 518057)])], figs=[ArticleFig(id=1249065623247065863, tenantId=1146029695717560320, journalId=1249024468962553931, articleId=1249065614510330276, language=EN, label=Fig.1, caption=
Schematic diagram of LPBF technology principle and engine components fabricated by LPBF (a)schematic diagram of the principle;(b)nickel-based superalloy turbine nozzle[27];(c)injector core of the Ariane 6 Rocket [29];(d)Ignus Ⅱ engine[30];(e)IN718 superalloy rocket nozzle [31], figureFileSmall=BiWJmv2rUjEZbzEV6P3urQ==, figureFileBig=CdPSTk7+ZPfm0/20HCeWLA==, tableContent=null), ArticleFig(id=1249065623381283599, tenantId=1146029695717560320, journalId=1249024468962553931, articleId=1249065614510330276, language=CN, label=图1, caption=
LPBF技术原理示意图及其成形发动机构件 (a)原理示意图;(b)镍基高温合金涡轮喷嘴[27];(c)Ariane 6火箭喷射器芯[29];(d)Ignus Ⅱ引擎[30];(e)IN718高温合金火箭喷嘴[31], figureFileSmall=BiWJmv2rUjEZbzEV6P3urQ==, figureFileBig=CdPSTk7+ZPfm0/20HCeWLA==, tableContent=null), ArticleFig(id=1249065623641330461, tenantId=1146029695717560320, journalId=1249024468962553931, articleId=1249065614510330276, language=EN, label=Fig.2, caption=
Microstructure evolution(a)[2] and morphology(b)[14] in melt pool of IN718 superalloy thin-walled structures fabricated by LPBF, figureFileSmall=LEEmK6gNvaW2CFKlyDb8zg==, figureFileBig=lw2erJdowdYBms1qPMxIVQ==, tableContent=null), ArticleFig(id=1249065625243554597, tenantId=1146029695717560320, journalId=1249024468962553931, articleId=1249065614510330276, language=CN, label=图2, caption=
LPBF成形IN718高温合金薄壁熔池内微观组织演变(a)[2]和形态(b)[14], figureFileSmall=LEEmK6gNvaW2CFKlyDb8zg==, figureFileBig=lw2erJdowdYBms1qPMxIVQ==, tableContent=null), ArticleFig(id=1249065625373578026, tenantId=1146029695717560320, journalId=1249024468962553931, articleId=1249065614510330276, language=EN, label=Fig.3, caption=
Morphologies of precipitation phases in IN718 superalloy (a)Laves phase[40];(b)MC phase[41];(c)δ phase[39];(d)γ′ phase[14];(e)γ′′ phase[14], figureFileSmall=xZPg+OPtxU6odbVOj2Y1vw==, figureFileBig=MBgLK1dsU7LGsa3r1EUaWw==, tableContent=null), ArticleFig(id=1249065625470047024, tenantId=1146029695717560320, journalId=1249024468962553931, articleId=1249065614510330276, language=CN, label=图3, caption=
IN718高温合金析出相形貌 (a)Laves相[40];(b)碳化物[41];(c)δ相[39];(d)γ′相[14];(e)γ′′相[14], figureFileSmall=xZPg+OPtxU6odbVOj2Y1vw==, figureFileBig=MBgLK1dsU7LGsa3r1EUaWw==, tableContent=null), ArticleFig(id=1249065625545544501, tenantId=1146029695717560320, journalId=1249024468962553931, articleId=1249065614510330276, language=EN, label=Fig.4, caption=
Warpage deformation of IN718 superalloy thin wall fabricated by LPBF (a)residual warpage[43];(b)deformation of IN718 square thin wall[46];(c)deformation process of metal cantilever beam[47], figureFileSmall=FQqzvIpMTA9IGBKf6+F+aQ==, figureFileBig=GpoZY8aq+VRkfw0W8Zne3g==, tableContent=null), ArticleFig(id=1249065625625236282, tenantId=1146029695717560320, journalId=1249024468962553931, articleId=1249065614510330276, language=CN, label=图4, caption=
LPBF成形IN718高温合金薄壁翘曲变形 (a)残余翘曲[43];(b)IN718方形薄壁变形[46];(c)金属悬臂梁变形过程[47], figureFileSmall=FQqzvIpMTA9IGBKf6+F+aQ==, figureFileBig=GpoZY8aq+VRkfw0W8Zne3g==, tableContent=null), ArticleFig(id=1249065625696539454, tenantId=1146029695717560320, journalId=1249024468962553931, articleId=1249065614510330276, language=EN, label=Fig.5, caption=
Microscopic morphologies of porosity in IN718 superalloy thin walls fabricated by LPBF[48] (a)incomplete melted powder particles;(b)adjacent deposited layers with insufficient fusion;(c)keyhole porosity, figureFileSmall=X2g3oyoazZNw3OWP7n8cVQ==, figureFileBig=TQwi2WudW1sSNACwrGZCRw==, tableContent=null), ArticleFig(id=1249065625834951493, tenantId=1146029695717560320, journalId=1249024468962553931, articleId=1249065614510330276, language=CN, label=图5, caption=
LPBF成形IN718高温合金薄壁孔隙微观形貌[48] (a)未完全熔化的粉末颗粒;(b)不充分熔合的相邻沉积层;(c)匙孔孔隙, figureFileSmall=X2g3oyoazZNw3OWP7n8cVQ==, figureFileBig=TQwi2WudW1sSNACwrGZCRw==, tableContent=null), ArticleFig(id=1249065625914643273, tenantId=1146029695717560320, journalId=1249024468962553931, articleId=1249065614510330276, language=EN, label=Fig.6, caption=
Cracks of superalloy thin walls fabricated by LPBF[54,57] (a)solidification cracks;(b)liquation cracks;(1)microscopic morphology;(2)schematic diagram of formation process, figureFileSmall=y7LqNOg3MD1m9otFBzF7qw==, figureFileBig=d3iKXApwbn3yPzAuNrzQ3Q==, tableContent=null), ArticleFig(id=1249065626015306577, tenantId=1146029695717560320, journalId=1249024468962553931, articleId=1249065614510330276, language=CN, label=图6, caption=
LPBF成形高温合金薄壁裂纹[54,57] (a)凝固裂纹;(b)液化裂纹;(1)微观形貌;(2)形成过程示意图, figureFileSmall=y7LqNOg3MD1m9otFBzF7qw==, figureFileBig=d3iKXApwbn3yPzAuNrzQ3Q==, tableContent=null), ArticleFig(id=1249065626107581266, tenantId=1146029695717560320, journalId=1249024468962553931, articleId=1249065614510330276, language=EN, label=Fig.7, caption=
Structural design of IN718 superalloy thin walls fabricated by LPBF (a)relationship between bottom surface roughness and inclination angles[61];(b)comparison of simulated and experimental deformation results of three support structures[65], figureFileSmall=kZGUHLcv0TpUH60J9XmaCg==, figureFileBig=cHiDgcmJXD739TFgQE33yA==, tableContent=null), ArticleFig(id=1249065626195661653, tenantId=1146029695717560320, journalId=1249024468962553931, articleId=1249065614510330276, language=CN, label=图7, caption=
LPBF成形IN718高温合金薄壁结构设计 (a)无支撑结构下表面粗糙度与倾斜角度的关系[61]; (b)3种不同支撑结构的模拟和实验变形结果比较[65], figureFileSmall=kZGUHLcv0TpUH60J9XmaCg==, figureFileBig=cHiDgcmJXD739TFgQE33yA==, tableContent=null), ArticleFig(id=1249065626287936346, tenantId=1146029695717560320, journalId=1249024468962553931, articleId=1249065614510330276, language=EN, label=Fig.8, caption=
Laser processing parameters of IN718 superalloy thin walls fabricated by LPBF (a)forming quality with different laser powers and scanning velocities[67];(b)influence of preheating substrate temperature on the forming quality[70], figureFileSmall=qz1FZpubSnBp7DUN9sB7oA==, figureFileBig=5lKVhLvU//7OqGpLWg5cjw==, tableContent=null), ArticleFig(id=1249065626371822429, tenantId=1146029695717560320, journalId=1249024468962553931, articleId=1249065614510330276, language=CN, label=图8, caption=
LPBF成形IN718高温合金薄壁激光工艺参数 (a)不同激光功率和扫描速度下成形质量[67];(b)预热基板温度对成形质量的影响[70], figureFileSmall=qz1FZpubSnBp7DUN9sB7oA==, figureFileBig=5lKVhLvU//7OqGpLWg5cjw==, tableContent=null), ArticleFig(id=1249065626455708513, tenantId=1146029695717560320, journalId=1249024468962553931, articleId=1249065614510330276, language=EN, label=Tab.1, caption=
Precipitation phases of IN718 superalloy[14,40-41]
, figureFileSmall=null, figureFileBig=null, tableContent=
| Phase | Crystal structure | Chemical formula | Lattice parameters | Solution temperature/ ℃ |
| a/nm | b/nm | c/nm |
| Laves | Hexagonal,C14 | AB2(MgZn2) | 0.4750-0.4950 | | 0.4500-0.4800 | 1163[40] |
| MC | Cubic,B1 | (Nb/Ti)C | 0.4300-0.4700 | | | 1260-1305[41] |
| δ | Orthorhombic,D0a | Ni3Nb | 0.5114 | 0.6244 | 0.4530 | 1020[41] |
| γ′′ | BCT,D022 | Ni3Nb | 0.3624 | | 0.7406 | 910-940[14] |
| γ′ | FCC,L12 | Ni3(Al,Ti,Nb) | 0.3561-0.3568 | | | 850-910[14] |
), ArticleFig(id=1249065626661229412, tenantId=1146029695717560320, journalId=1249024468962553931, articleId=1249065614510330276, language=CN, label=表1, caption=
IN718高温合金的析出相[14,40-41]
, figureFileSmall=null, figureFileBig=null, tableContent=
| Phase | Crystal structure | Chemical formula | Lattice parameters | Solution temperature/ ℃ |
| a/nm | b/nm | c/nm |
| Laves | Hexagonal,C14 | AB2(MgZn2) | 0.4750-0.4950 | | 0.4500-0.4800 | 1163[40] |
| MC | Cubic,B1 | (Nb/Ti)C | 0.4300-0.4700 | | | 1260-1305[41] |
| δ | Orthorhombic,D0a | Ni3Nb | 0.5114 | 0.6244 | 0.4530 | 1020[41] |
| γ′′ | BCT,D022 | Ni3Nb | 0.3624 | | 0.7406 | 910-940[14] |
| γ′ | FCC,L12 | Ni3(Al,Ti,Nb) | 0.3561-0.3568 | | | 850-910[14] |
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