Effect of Microstructural Characteristics on Fracture Toughness in Direct Energy Deposited Novel Ti-6Al-4V-1 Mo Alloy

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外文摘要：Meeting the damage tolerance requirements for engineering-grade titanium alloys pose a significant challenge in achieving high fracture toughness in direct energy deposition(DED)titanium alloys.This work primarily investigated the relationship between the microstructure and the fracture toughness of DED new Ti-6Al-4V-1Mo alloy.Two types of microstructures were designed via two process strategies:high-line energy density(HE)and low-line energy density(LE).Relative to LE samples,HE samples possess larger-sized microstructural characteristics(coarser grain boundary α(αGB),larger α colonies,and coarser α laths).Less α/β phase boundaries were formed by coarser α laths in the HE samples,increasing the movement of dislocations,resulting in tensile strength decreasing from 1007.1 MPa(LE)to 930.8 MPa(HE)and elongation increasing from 10.8％(LE)to 15.7％(HE).Also,HE samples exhibited an excellent fracture toughness of 114.0 MPa m1/2,significantly higher than that of LE samples(76.8 MPa m1/2).An analysis of crack propagation paths was conducted to investigate the factors contributing to toughening.The primary factor enhancing toughness is the frequent obstruction of cracks by coarseαGB and large α colonies in HE samples.Particularly,the pretty large-angle deflections induced by the superposition effect of coarse αGB and large α colonies play a vital of significant role.These factors induced the long and tortuous high-energy pathways,which resulted in ultimately improved fracture toughness.The discovered microstructural toughening mechanisms can serve as a reference for future studies involving titanium alloys,offering insights on how to enhance fracture toughness by achieving similar characteristics.

外文关键词：

Direct energy depositionTi-6Al-4V-1MoTensile propertiesFracture toughnessCrack propagation

作者：

Chao Xia、Kexin Zhao、Xin Zhou、Yuqi He、Panpan Gao、Hengxin Zhang、Guangrui Gao、Fengying Zhang、Hua Tan

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作者单位：

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

Science and Technology on Plasma Dynamics Laboratory,Air Force Engineering University,Xi'an 710038,China

Surface Material Protection Co.,Ltd,Xi'an 710018,China

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

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基金：

陕西省重点研发计划China 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 University

项目编号：

2023-YBGY-359202110821ZCZZHXJS-QC Y6-000121CXLHTJSGG-QCY8-00036142202210203

出版年：

2024

DOI：

10.1007/s40195-023-01650-4

金属学报(英文版)

中国金属学会

金属学报(英文版)

CSTPCD

影响因子：0.77

ISSN：1006-7191

年,卷(期)：2024.37(1)

参考文献量39