期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 646, 期 -, 页码 303-309出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2015.05.178
关键词
Additive manufacturing; Electron beam melting; Titanium alloys; Martensitic transformations; Finite element simulations
资金
- A*STAR industrial additive manufacturing program: work package 3 ( [132 550 4103]
- Singapore Economic Development Board (EDB)
Build thickness dependent microstructure of electron beam melted (EBM (R)) Ti-6Al-4V has been investigated from both experiment and simulation using four block samples with thicknesses of 1, 5, 10 and 20 mm. We observe a mixed microstructure of alternate alpha/beta with some alpha' martensite inside the 1 mm-thick sample. By contrast, only the alternate a/b microstructure with both colony and basket-weave morphologies occurs inside the 5 mm-, 10 mm-and 20 mm-thick samples. It is found that beta spacing is constantly increased with the build thickness, leading to an obvious decrease in microhardness. Finite element method (FEM) simulations show that cooling rates and thermal profiles during EBM process are favorable for the formation of martensite. Moreover, full-scale FEM simulations reveal that the average temperature inside the samples is higher as the build thickness increases. It suggests that martensitic decomposition is faster in thicker samples, which is in good agreement with the experimental observations. (C) 2015 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据