Effect of Scanning Strategy on Additively Manufactured Ti6Al4V

被引：0

作者：

Ghate, Nakul D. ^{[1
]}

Gaur, Bhanupratap ^{[1
]}

Shrivastava, Amber ^{[1
]}

机构：

[1] Indian Inst Technol, Dept Mech Engn, Mumbai, Maharashtra, India

来源：

TMS 2020 149TH ANNUAL MEETING & EXHIBITION SUPPLEMENTAL PROCEEDINGS | 2020年

关键词：

Direct metal laser sintering; Scanning strategy; Phase transformation; Microhardness; LASER; MICROSTRUCTURE;

D O I：

10.1007/978-3-030-36296-6_33

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This study investigates the influence of different scanning strategies on the hardness of the parts, fabricated by direct metal laser melting. In this work, prealloyed powder of titanium alloy (Ti-6Al-4V) is used to produce dense parts with three different scanning strategies: unidirectional, alternate, and cross-hatching. A numerical scheme is developed to predict the heat transfer, fluid flow, and thermal history-based phase transformation during the process. Surface hardness is calculated from the obtained phase fractions. Hardness is measured experimentally, and X-ray diffraction is used for phase identification. The hardness is found to be highly dependent on the microstructure of as-built parts. The results show that rapid solidification during direct metal laser melting leads to the formation of hcp-structured acicular martensite from the parent beta phase, which increases the hardness. Higher part densities are observed for cross-hatching strategy compared to other scanning strategies. The predicted maximum hardness for different scanning strategies compare well against the experimental observations.

引用

页码：353 / 365

页数：13

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