Enhanced low cycle fatigue properties of selective laser melting Ti-6Al-4V with fine-tuned composition and optimized microstructure
作者机构：School of Material Science and EngineeringChang'an UniversityXi'an 710064China State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXi'an 710072China School of Mechanical and Automotive EngineeringSouth China University of TechnologyGuangzhou 510641China
出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)
年 卷 期：2024年第180卷第13期
页 面：129-140页
核心收录：
学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
基 金：Key Research and Development Projects of Shaanxi Province(No.2023-YBGY-359) China CEEC University Joint Education Project(2021108) Science and Technology Plan of Xi'an City(Nos.21ZCZZHXJS-QCY6-0001,21CXLHTJSGG-QCY8-0003) Open Fund of Key Laboratory of Plasma Dynamics of Air Force Engineering University(No.6142202210203) “Qin Chuang Yuan”Project of Shaanxi Province(No.2023KXJ-272)
主 题：Additive manufacturing Selective laser melting Titanium alloy Low cycle fatigue Microstructure
摘 要：Improving the low-cycle fatigue(LCF)properties of additively manufactured Ti-5.6Al-3.8V alloy is critical in ensuring its service safety and represents a significant research *** work discusses a so-lution that optimizes the alloy s microstructure and ductility by precisely controlling the over-saturated strengthening elements and heat *** was accomplished using selective laser melting(SLM),heat treatment at 800 ℃ for 2 h,and furnace cooling on a Ti-5.6Al-3.8V alloy with tightly controlled Al,V,and O concentrations in a lower *** results showed that the SLM-fabricated Ti-5.6Al-3.8V alloy,post-heat treatment,exhibited α laths with a width of~1.4 μm and β columnar grains with a diameter of~126 μm,without experiencing coarsening or variant selection *** alloy bal-anced strength and ductility post-heat treatment with a UTS of 1015 MPa and an EL of 16.5%relative to the as-deposited state(UTS of 1199 MPa and EL of 11.9%).Notably,the LCF properties of the heat-treated SLM Ti-5.6Al-3.8V alloy are superior to those of other Ti-6Al-4V alloys produced by additive manu-facturing and comparable to traditional *** high strain amplitudes(1-1.5%),the fatigue life of this alloy was twice that of the Ti-6Al-4V ***,we comprehensively analyzed the mi-crostructure,strength,and ductility of the SLM Ti-5.6Al-3.8V alloy to elucidate the factors influencing its LCF *** findings provide a solid foundation for improving the LCF properties of additively manufactured Ti-6Al-4V alloy,thereby contributing to its safe and reliable use in critical applications.
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