Effect of high energy ball milling on spherical metallic powder particulates for additive manufacturing
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Authors
Ansell, Troy Y.
Hanneman, Timothy
Gonzalez-Perez, Andres
Park, Chanman
Nieto, Andy
Subjects
Cold spray
additive manufacturing
high energy ball milling
steel powder
copper powder
additive manufacturing
high energy ball milling
steel powder
copper powder
Advisors
Date of Issue
2021
Date
Publisher
Taylor & Francis
Language
Abstract
Properties, such as morphology, particle size, and hardness affect the ability of a powder to flow and bond to a surface in additive manufacturing (AM) applications. The effects of high energy ball milling on spherical copper and stainless steel powders were evaluated. Morphology of both stainless steel and copper powders, quantifiable by aspect ratio, showed larger changes due to ball-to-powder ratio (BPR, 2:1–1:10) compared to the total milling time (2–60min). Hardness of copper increased from 53 HV0.01 in the as-received condition to 96 HV0.01 after milling for 60min with a BPR of 1:1 or 2:1. Hardness of steel increased from 336 HV0.01 in the as-received condition to 523 HV0.01 after milling for 60min with a BPR of 2:1. Hardness of both powders was insensitive to milling times at low BPR (1:10). At high BPR (2:1), hardness of steel increases after just 2min of milling, while Cu changed significantly only after 60min. Hardness was influenced more by BPR than by milling time. It is shown that a broad range of milling parameters exist where metallic powders can be processed with minimal changes to their morphology, while controlling for hardness.
Type
Article
Description
17 USC 105 interim-entered record; under review.
The article of record as published may be found at https://doi.org/10.1080/02726351.2021.1876192
The article of record as published may be found at https://doi.org/10.1080/02726351.2021.1876192
Series/Report No
Department
Mechanical and Aerospace Engineering (MAE)
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
The Hartnell College and California State University at Monterey Bay for supporting and organizing the Hartnell Community College Catalyst (3C) programs which enabled T. Hanneman and A. Gonzalez-Perez to conduct research at NPS during the summer of 2019.
NPS Foundation SEED program
NPS Research Initiation Program
NPS Foundation SEED program
NPS Research Initiation Program
Funding
Format
10 p.
Citation
Ansell, Troy Y., et al. "Effect of high energy ball milling on spherical metallic powder particulates for additive manufacturing." Particulate Science and Technology (2021): 1-9.
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.