Constructing a novel bi-lamellar microstructure in selective laser melted Ti-6Al-4V alloy via electropulsing for improvement of strength and corrosion resistance

作     者：Xudong Yan Xiaofeng Xu Yachong Zhou Zhicheng Wu Lai Wei Dayong Zhang Xudong Yan;Xiaofeng Xu;Yachong Zhou;Zhicheng Wu;Lai Wei;Dayong Zhang

作者机构：School of Ocean Science and TechnologyDalian University of TechnologyPanjin 124221China Key Laboratory of Automobile MaterialsMinistry of Educationand Department of Materials Science and EngineeringJilin UniversityChangchun 130025China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术(英文版))

年 卷 期：2024年第193卷第26期

页      面：37-50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）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：supported by the Provincial Key Research and Development Program of Jilin(No.20230201158GX) the National Key Research and Development Program of China(Nos.2020YFB2008300,2020YFB2008303,and 2020YFB2008304) the Shandong Provincial Natural Science Foundation(Grant No.ZR202102220408) the National Natural Science Foundation of China(Grant No.51701080) the Talent Development-Excellent Young Talents Fund Project,China(Grant No.20190103053JH) 

主　　题：SLM Ti-6Al-4V alloy Alloy element partitioning Mechanical properties Corrosion resistance 

摘      要：Traditional heat treatments may cause deterioration in the yield strength and corrosion resistance of the selective laser-melted(SLM)Ti-6Al-4V alloy due to the coarsening ofαlath and alloy element partitioning(AEP).However,electropulsing has been found to inhibit the growth of primaryαand the process of *** also introduces finerαlath in the transformedβregion and generates a novel bi-lamellar *** microstructure has minimal element concentration difference between the primaryαand transformedβ.As a result,the transformedβregion exhibits a higher content of Al element and finerαlath,leading to a higher overall yield strength(952 MPa)compared to the heat-treated sample(855 MPa).The novel microstructure induced by electropulsing enhances the polarization resistance,improves the stability and thickness of the passive film,and ultimately enhances the corrosion ***,this technology can be extended to other SLMα+βtitanium alloys to simultaneously improve their mechanical properties and corrosion resistance.