首页|Enhanced low cycle fatigue properties of selective laser melting Ti-6Al-4V with fine-tuned composition and optimized microstructure

Enhanced low cycle fatigue properties of selective laser melting Ti-6Al-4V with fine-tuned composition and optimized microstructure

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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 challenge.This work discusses a so-lution that optimizes the alloy's microstructure and ductility by precisely controlling the over-saturated strengthening elements and heat treatment.This 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 range.The 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 phenomena.The 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 forgings.At high strain amplitudes(1-1.5％),the fatigue life of this alloy was twice that of the Ti-6Al-4V forgings.Furthermore,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 properties.These 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.

Additive manufacturingSelective laser meltingTitanium alloyLow cycle fatigueMicrostructure

Yuqi He、Fengying Zhang、Yuhong Dai、Kexin Zhao、Zimeng Ye、Zerong Yu、Chao Xia、Hua Tan

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School of Material Science and Engineering,Chang'an University,Xi'an 710064,China

School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510641,China

State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China

Key Research and Development Projects of Shaanxi ProvinceChina CEEC University Joint Education ProjectScience and Technology Plan of Xi'an CityScience and Technology Plan of Xi'an CityOpen Fund of Key Laboratory of Plasma Dynamics of Air Force Engineering Universitythe"Qin Chuang Yuan"Project of Shaanxi Province

2023-YBGY-359202110821ZCZZHXJS-QCY6-000121CXLHTJSGG-QCY8-000361422022102032023KXJ-272

2024

10.1016/j.jmst.2023.09.017

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.180(13)
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