We have recently published a Special Issue of “Correlation between Microstructure and Macromechanical Properties in Additive Manufacturing and Welding”. You are welcome to access the articles in the Special Issue for free at the following link: https://www.mdpi.com/journal/crystals/special_issues/welding_crystals (accessed on 12 December 2022).
In this Special Issue, Jaka Burja and coworkers [1] reported the effect of Ni addition on the as-cast microstructure of duplex Fe-Mn-Al-C lightweight steel. The duplex Fe-Mn-Al-C lightweight steel has excellent mechanical properties with a low density, which is desirable for automotive lightweighting. The as-cast microstructure of five duplex lightweight steels (i.e., Fe-15Mn-10Al-0.8C, Fe-15Mn-10Al-1.7Ni-0.8C, Fe-15Mn-10Al-3.9Ni-0.8C, Fe-15Mn-10Al-5.6Ni-0.8C, and Fe-15Mn-10Al-8.6Ni-0.8C) with different Ni contents was investigated, highlighting the superiority of Ni addition.
Ni-Al-Mo-based alloys are favored for applications in high-temperature environments. Mo is an important element affecting crystal growth to ensure excellent mechanical properties. Jitka Malcharcziková and coworkers [2] proposed a method for modifying Ni-Al-Mo-based alloys by controlling the Ni content and using a special remelting method. The modified Ni-Al-Mo alloy has a great potential for use in structural components operating at high temperatures.
In addition to elemental additions in bulk materials, there are also articles which focus on powder alloying, dissimilar material wettability behavior, and dissimilar joining characteristics. Claudia Georgina Nava-Dino and coworkers [3] investigated the mechanical alloying of Cr2Nb powders used to prepare a high-performance Nb-Cr alloy, which is popular for high-temperature environments. In particular, the electrochemical noise test was performed to identify the electrochemical behavior. Huaijin Wang and coworkers [4] focused on the wettability and spreading behavior of dissimilar materials, which is critical for the reliable joining of metals to ceramics. Specifically, they investigated the wettability and spreading behavior of Sn-Ti on Si3N4, clarifying that the increase in the Ti content causes the thickening of the Ti5Si3 layer, which benefits the reduction in the equilibrium contact angle. Kai Yu and coworkers [5] performed laser welding of AZ31B and DP590 using Cu-Si composite powder as the interlayer, indicating that the interlayer hinders the diffusion of the Al element and decreases the thickness of the reaction layer at the interface between AZ31B and DP590. Additionally, the increase in the Si content in the interlayer is beneficial to improve the plastic deformability and ductility of the reaction layer.
In summary, this Special Issue introduces the preparation and joining of materials suitable for high-temperature environments in the manufacturing industry and explores the relationship between the microstructure and macromechanical properties, with special emphasis on the importance of element additions.
Funding
This research received no external funding.
Conflicts of Interest
The authors declare no conflict of interest.
References
- Burja, J.; Šetina Batič, B.; Balaško, T. Influence of the Addition of Ni on as-Cast Microstructure of Duplex Fe-Mn-Al-C Lightweight Steel. Crystals 2021, 11, 1551. [Google Scholar] [CrossRef]
- Malcharcziková, J.; Skotnicová, K.; Kawulok, P.; Kawulok, R.; Szurman, I.; Růžička, J. Preparation and Properties of Directionally Solidified Ni-Al Based Alloys Modified by Molybdenum. Crystals 2022, 12, 215. [Google Scholar] [CrossRef]
- Nava-Dino, C.-G.; Flores-De los Ríos, J.-P.; Maldonado-Orozco, M.-C.; Sánchez-Carrillo, M.; Bautista-Margulis, R.-G.; Delgado, A.-D.; Almeraya-Calderón, F. Electrochemical Noise Response of Cr2Nb Powders Applying Mechanical Alloying. Crystals 2022, 12, 482. [Google Scholar] [CrossRef]
- Wang, H.; Fu, W.; Xue, Y.; Huo, S.; Guo, M.; Hu, S.; Song, X. Wettability and Spreading Behavior of Sn–Ti Alloys on Si3N4. Crystals 2022, 12, 921. [Google Scholar] [CrossRef]
- Yu, K.; Lei, M.; Zeng, A.; Zhang, H. Microstructure and Mechanical Properties of Laser Welded Magnesium Alloy/Steel Joint Using Cu-Si Composite Interlayer. Crystals 2022, 12, 1083. [Google Scholar] [CrossRef]
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