Microstructure and Fatigue Behavior of EBSM Ti-6Al-4V Alloy

被引：0

作者：

Chen Wei ^{[1
,2
,3
,4
]}

Chen Zheyuan ^{[1
,2
,3
,4
]}

You Yang ^{[1
]}

Li Jinshan ^{[5
]}

机构：

[1] Beijing Aeronaut Mfg Technol Res Inst, Beijing 100024, Peoples R China

[2] Power Beam Proc Lab, Beijing 100024, Peoples R China

[3] Beijing Key Lab Power Beam Met Addit Mfg Technol, Beijing 100024, Peoples R China

[4] Aviat Key Lab Sci & Technol Addit Mfg, Beijing 100024, Peoples R China

[5] Northwestern Polytech Univ, Xian 710072, Peoples R China

来源：

RARE METAL MATERIALS AND ENGINEERING | 2017年 / 46卷

关键词：

additive manufacturing; Ti-6Al-4V; microstructure; high cycle fatigue; fracture analysis; DEPOSITION; TEXTURE;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The microstructure, tensile and fatigue properties of Ti-6Al-4V alloy made by EBSM were studied. The as-built material exhibits a columnar microstructure in which the prior-beta grains grow along the building direction. Within each beta grain, Widmanstatten microstructure is dominant, and colonies of alpha/beta platelets are also present. The tensile strength of as-built material is not affected by defects and the average tensile strength and ductility meet the ASTM standard. HIPing removes all defects in the EBSM Ti-6Al-4V alloy and increases tensile elongation by similar to 35%, but the strength is 5% lower due to microstructure coarsening. The fatigue life is also significantly improved by HIPing and the fatigue limit reaches 600 MPa under 1 X 10(7) cycle, R=0.1 condition. The large scatter of fatigue life is maily attributed to the scatter of tensile properties. In most of the samples, crack initiates from the surface. The crack initiation mechanism is proposed base on fracture analysis of typical fatigue specimens.

引用

页码：25 / 30

页数：6

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