Size effect on the microstructure, phase transformation behavior, and mechanical properties of NiTi shape memory alloys fabricated by laser powder bed fusion
作者机构：Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education)Shandong UniversityJinan 250061China Department of Materials EngineeringUniversity of Leuven(KU Leuven)Heverlee B3001Belgium School of Mechanical EngineeringNanjing University of Science and TechnologyNanjing 210094China School of Energy and Power EngineeringShandong UniversityJinan 250061China Shandong Institute of Medical Device and Pharmaceutical Packaging InspectionJinan 250101China Departament de FísicaUniversitat de les Illes BalearsCra Valldemossa km 7.5Palma de Mallorca E07122Spain
出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)
年 卷 期：2023年第157卷第26期
页 面：200-212页
核心收录：
学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 0806[工学-冶金工程] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0824[工学-船舶与海洋工程]
基 金：supported by the National Nature Science Foun-dation of China(grant No.51905310) Natural Science Founda-tion of Shandong Province(Nos.ZR2020YQ39 and ZR2020ZD05) the Young Scholars Program of Shandong University(grant No.2018WLJH24) and Shandong Medical Products Administration(grant No.SDNMPAFZLX202204) the sup-port from MCIN/AEI/10.13039/501100011033 and FEDER Una Man-era de Hacer Europa,EU(project No.RTI2018-094683-B-C51).
主 题：Shape memory alloy NiTi Additive manufacturing Laser powder bed fusion Size effect
摘 要：In this work,NiTi samples with different thicknesses(0.15-1.00 mm)were fabricated by laser powder bed fusion(LPBF)under variable scanning speeds(500-1200 mm s^(-1)).The densification behavior,phase transformation behavior,and mechanical properties of the sample with different thicknesses are studied.The results indicate a strong size effect in the LPBF-fabricated NiTi alloy.The decrease of the sample thickness results in(i)the increase of porosity,(ii)the decrease of the number of adhered NiTi powder particles at the surface,(iii)the monotonous decrease of the martensitic transformation temperatures(MTTs),and(iv)the decrease of the shape recovery temperature.The influence of sample thickness on the melt-pool behavior,and thus the microstructure and performance of NiTi alloys are discussed.It is suggested that the melt-pool is deeper and narrower in the thin samples than in the thick samples.We conclude that,apart from the LPBF process conditions,the sample dimensions have also to be considered to fabricate NiTi structures with predictable properties.
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