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Forging of Mg-Al-Zn Magnesium Alloys on Screw Press and Forging Hammer

Magnesium alloys are highly strain rate sensitive and exhibit good workability in a narrow forging temperature range. Consequently, parts made of these materials are usually forged with low-speed hydraulic presses, using specially designed tool heating systems in order to ensure near-isothermal cond...

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Autores principales: Gontarz, Andrzej, Drozdowski, Krzysztof, Michalczyk, Jacek, Wiewiórowska, Sylwia, Pater, Zbigniew, Tomczak, Janusz, Samołyk, Grzegorz, Winiarski, Grzegorz, Surdacki, Piotr
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7793520/
https://www.ncbi.nlm.nih.gov/pubmed/33374712
http://dx.doi.org/10.3390/ma14010032
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author Gontarz, Andrzej
Drozdowski, Krzysztof
Michalczyk, Jacek
Wiewiórowska, Sylwia
Pater, Zbigniew
Tomczak, Janusz
Samołyk, Grzegorz
Winiarski, Grzegorz
Surdacki, Piotr
author_facet Gontarz, Andrzej
Drozdowski, Krzysztof
Michalczyk, Jacek
Wiewiórowska, Sylwia
Pater, Zbigniew
Tomczak, Janusz
Samołyk, Grzegorz
Winiarski, Grzegorz
Surdacki, Piotr
author_sort Gontarz, Andrzej
collection PubMed
description Magnesium alloys are highly strain rate sensitive and exhibit good workability in a narrow forging temperature range. Consequently, parts made of these materials are usually forged with low-speed hydraulic presses, using specially designed tool heating systems in order to ensure near-isothermal conditions. This study investigates whether popular magnesium alloys such as Mg-Al-Zn can be forged in forging machines equipped with high-speed forming tools. Experimental upset forging tests on AZ31B, AZ61A and AZ80A specimens were conducted, using a screw press with a ram speed of 0.5 m/s and a die forging hammer with a ram speed at stroke of about 5 m/s. Test specimens were preheated to 350 °C, 410 °C and 450 °C. After the upset forging process, they were air- or water-cooled and then examined for their workability, hardness and grain size. To validate the results, a forging process for a producing handle was designed and modelled by the finite element method. Distributions of strain, temperature and fracture criterion were analysed, and energy and force parameters of the forging process were calculated. After that, experimental tests were performed on AZ31B and AZ61A specimens in order to determine mechanical properties of forged parts and examine their micro- and macrostructure. Results have demonstrated that AZ80A is not suitable for forging with either the screw press or the die forging hammer, that AZ61A can be press- and hammer-forged but to a limited extent, and that AZ31B can be subjected to forging in both forging machines analysed in the study.
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spelling pubmed-77935202021-01-09 Forging of Mg-Al-Zn Magnesium Alloys on Screw Press and Forging Hammer Gontarz, Andrzej Drozdowski, Krzysztof Michalczyk, Jacek Wiewiórowska, Sylwia Pater, Zbigniew Tomczak, Janusz Samołyk, Grzegorz Winiarski, Grzegorz Surdacki, Piotr Materials (Basel) Article Magnesium alloys are highly strain rate sensitive and exhibit good workability in a narrow forging temperature range. Consequently, parts made of these materials are usually forged with low-speed hydraulic presses, using specially designed tool heating systems in order to ensure near-isothermal conditions. This study investigates whether popular magnesium alloys such as Mg-Al-Zn can be forged in forging machines equipped with high-speed forming tools. Experimental upset forging tests on AZ31B, AZ61A and AZ80A specimens were conducted, using a screw press with a ram speed of 0.5 m/s and a die forging hammer with a ram speed at stroke of about 5 m/s. Test specimens were preheated to 350 °C, 410 °C and 450 °C. After the upset forging process, they were air- or water-cooled and then examined for their workability, hardness and grain size. To validate the results, a forging process for a producing handle was designed and modelled by the finite element method. Distributions of strain, temperature and fracture criterion were analysed, and energy and force parameters of the forging process were calculated. After that, experimental tests were performed on AZ31B and AZ61A specimens in order to determine mechanical properties of forged parts and examine their micro- and macrostructure. Results have demonstrated that AZ80A is not suitable for forging with either the screw press or the die forging hammer, that AZ61A can be press- and hammer-forged but to a limited extent, and that AZ31B can be subjected to forging in both forging machines analysed in the study. MDPI 2020-12-23 /pmc/articles/PMC7793520/ /pubmed/33374712 http://dx.doi.org/10.3390/ma14010032 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Gontarz, Andrzej
Drozdowski, Krzysztof
Michalczyk, Jacek
Wiewiórowska, Sylwia
Pater, Zbigniew
Tomczak, Janusz
Samołyk, Grzegorz
Winiarski, Grzegorz
Surdacki, Piotr
Forging of Mg-Al-Zn Magnesium Alloys on Screw Press and Forging Hammer
title Forging of Mg-Al-Zn Magnesium Alloys on Screw Press and Forging Hammer
title_full Forging of Mg-Al-Zn Magnesium Alloys on Screw Press and Forging Hammer
title_fullStr Forging of Mg-Al-Zn Magnesium Alloys on Screw Press and Forging Hammer
title_full_unstemmed Forging of Mg-Al-Zn Magnesium Alloys on Screw Press and Forging Hammer
title_short Forging of Mg-Al-Zn Magnesium Alloys on Screw Press and Forging Hammer
title_sort forging of mg-al-zn magnesium alloys on screw press and forging hammer
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7793520/
https://www.ncbi.nlm.nih.gov/pubmed/33374712
http://dx.doi.org/10.3390/ma14010032
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