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Metals, Volume 11, Issue 7

July 2021 - 152 articles

Cover Story: We studied how voids in LPBF AISI 316L can be closed by the laser exposure of subsequent layers. We used standard process parameters for the laser exposure to build a cylindrical specimen in which certain quarters were not exposed by the laser. Increasing the layer thickness to four times the standard layer thickness does not create additional porosity. The combined results of ex situ computed tomography and in situ optical tomography reveal that the melt pools of superjacent layers can melt powder particles up to 500 µm below the current surface. Void formation in regions below the current surface is not only caused by an insufficient overlap of the melt pool width, but also the surface roughness of the solid material below the non-exposed sections creates seeding points for void formation. View this paper.
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Articles (152)

  • Article
  • Open Access
4 Citations
2,513 Views
16 Pages

20 July 2021

In this work, the effect of the Al content (x = 5, 10, and 15 at. %) on the martensitic transformation (MT) and microstructure and mechanical properties of Cu(50−x)Zr50Alx alloys was studied. The microstructure of the alloys was characterized at room...

  • Article
  • Open Access
13 Citations
4,514 Views
15 Pages

Effects of Aging under Stress on Mechanical Properties and Microstructure of EN AW 7075 Alloy

  • Seyed Vahid Sajadifar,
  • Philipp Krooß,
  • Hannes Fröck,
  • Benjamin Milkereit,
  • Olaf Kessler and
  • Thomas Niendorf

20 July 2021

In the present study, microstructural and mechanical properties of EN AW 7075 following stress-aging were assessed. For this purpose, properties of stress-aged samples were compared with values obtained for conventionally aged counterparts. It is rev...

  • Article
  • Open Access
4 Citations
4,383 Views
13 Pages

Towards Greener Industry: Modelling of Slag Heat Recovery

  • Reza Safavi Nick,
  • Virpi Leinonen,
  • Juha Mäyrä and
  • Johan Björkvall

20 July 2021

The steel industry, in accordance with the momentum of greener industry, has welcomed the changes and is actively pursuing that objective. One such activity is the commitment to energy recovery from by-products such as slag since the average energy c...

  • Article
  • Open Access
7 Citations
2,525 Views
14 Pages

Effect of abc Pressing at 573 K on the Microstructure and Martensite Transformation Temperatures in Ti49.8Ni50.2 (at%)

  • Oleg Kashin,
  • Aleksandr Ivanovich Lotkov,
  • Victor Grishkov,
  • Konstantin Krukovskii,
  • Dorzhima Zhapova,
  • Yuri Mironov,
  • Natalia Girsova,
  • Olga Kashina and
  • Elena Barmina

20 July 2021

This paper presents experimental data on the microstructure and martensite transformation temperatures of Ti49.8Ni50.2 (at%) after abc pressing (multi-axial forging) to different true strains e from 1.84 to 9.55 at 573 K. The data show that increasin...

  • Article
  • Open Access
6 Citations
3,015 Views
15 Pages

20 July 2021

To apply the duplex type low-carbon medium-manganese steel to the hot/warm-forging and -stamping products, the influence of cooling process routes immediately after intercritical annealing such as air-cooling (AC) and isothermal transformation (IT) p...

  • Article
  • Open Access
6 Citations
3,856 Views
19 Pages

Reduction of Warping in Kinematic L-Profile Bending Using Local Heating

  • Eike Hoffmann,
  • Rickmer Meya and
  • A. Erman Tekkaya

20 July 2021

Kinematic bending of profiles allows to manufacture parts with high flexibility concerning the geometry. Still, the production of profiles with asymmetric cross-sections regarding the force application axis using kinematic bending processes offers ch...

  • Article
  • Open Access
12 Citations
4,747 Views
11 Pages

Comparative Study of the Metallurgical Quality of Primary and Secondary AlSi10MnMg Aluminium Alloys

  • Asier Bakedano,
  • Andrea Niklas,
  • Ana Isabel Fernández-Calvo,
  • Gorka Plata,
  • Jokin Lozares and
  • Carlos Berlanga-Labari

20 July 2021

The use of secondary aluminium is increasingly being promoted in the automotive industry for environmental reasons. The purpose of this study was to demonstrate that it is possible to obtain a recycled AlSi10MnMg(Fe) aluminium alloy with equal metall...

  • Article
  • Open Access
16 Citations
4,595 Views
11 Pages

20 July 2021

Lithium is one of the secondary mineral elements occurring in bauxite. The behavior of lithium-bearing bauxite in the digestion process was investigated, and the effect of digestion conditions on the extraction rates of lithium was studied. The resul...

  • Feature Paper
  • Article
  • Open Access
27 Citations
7,115 Views
15 Pages

Heat Treatment Design for a QP Steel: Effect of Partitioning Temperature

  • Marcel Carpio,
  • Jessica Calvo,
  • Omar García,
  • Juan Pablo Pedraza and
  • José María Cabrera

19 July 2021

Designing a new family of advanced high-strength steels (AHSSs) to develop automotive parts that cover early industry needs is the aim of many investigations. One of the candidates in the 3rd family of AHSS are the quenching and partitioning (QP) ste...

  • Article
  • Open Access
21 Citations
4,076 Views
17 Pages

Non-Isothermal Reduction Kinetics of Iron Ore Fines with Carbon-Bearing Materials

  • Abourehab Hammam,
  • Yi Cao,
  • Abdel-Hady A. El-Geassy,
  • Mohamed H. El-Sadek,
  • Ying Li,
  • Han Wei,
  • Mamdouh Omran and
  • Yaowei Yu

19 July 2021

This study investigates the non-isothermal reduction of iron ore fines with two different carbon-bearing materials using the thermogravimetric technique. The iron ore fines/carbon composites were heated from room temperature up to 1100 °C with differ...

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Metals - ISSN 2075-4701