Exploratory Studies of Mechanical Properties, Residual Stress, and Grain Evolution at the Local Regions near Pores in Additively Manufactured Metals

Li, Wei; Bian, Ning; Nagaraja, Kishore Mysore; Zhang, Xinchang; Lu, Hongbing

doi:10.3390/ma17133277

Exploratory Studies of Mechanical Properties, Residual Stress, and Grain Evolution at the Local Regions near Pores in Additively Manufactured Metals

Journal Article · Wed Jul 03 00:00:00 EDT 2024 · Materials

DOI:https://doi.org/10.3390/ma17133277· OSTI ID:2514376

Li, Wei ^[1]; Bian, Ning ^[1]; Nagaraja, Kishore Mysore ^[1]; ^[2]; Lu, Hongbing ^[1]

Univ. of Texas at Dallas, Richardson, TX (United States)
Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Directed energy deposition (DED) is gaining widespread acceptance in various industrial applications since its unique manufacturing features allow the DED to print metallic parts with very complex geometries. However, DED inevitably generates a lot of internal pores which can limit the widespread applications of the DED technique. The current studies on DED porosity are mostly focused on analyzing pores’ bulk-scale influences on mechanical properties and performances. Since DED pores have a micro-scale existence, with dimensions ranging from a few microns to several hundred microns, it is fundamental to explore the pores’ influences on the micro-scale, including local mechanical properties, residual stress, and grains near pores. However, this important research direction has been neglected. The objective of this work is to fill the above gap in DED porosity research and acquire a fundamental understanding of the role of porosity on a microscopic scale. The authors used nanoindentation approaches to investigate internal pores’ effects on mechanical properties and residual stress in local regions surrounding the pores. In addition, the grains near pores were observed through EBSD, and simulated with the Kinetic Monte Carlo model. The research findings can be provided for DED researchers and industrial practitioners as technical guidance. Most importantly, the research results can work as a good reference for tracing the source of bulk-scale mechanical performances and properties of DED parts with internal pores.

View Accepted Manuscript (DOE)

Research Organization:: Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC07-05ID14517

OSTI ID:: 2514376

Alternate ID(s):: OSTI ID: 2470400

Report Number(s):: INL/JOU--24-78894-Rev000

Journal Information:: Materials, Journal Name: Materials Journal Issue: 13 Vol. 17; ISSN 1996-1944

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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