Journal Published Online: 25 June 2019
Volume 8, Issue 6

Structure and Properties of High-Strength Low-Alloy Steel Melted by the Laser Beam



In this article, examinations were presented of laser beam remelting of microalloyed high-strength low-alloy steel—28MnTiNbVB (UTS = 1,600 MPa), 12 mm thick. The remelting process was carried out with variable linear energy in the range from 0.6 to 2.6 kJ/cm. The examinations have shown that remelted zones have a correct geometry but also include gas pores that could be caused by very high cooling rates, resulting in the hindering of gas evacuation from remelted zones. These gas pores are caused by trapping gases dissolved in metal or vaporizing alloying elements. Remelted zone is martensitic with a lath structure and a hardness up to 600 HV10. Laths are smaller, and smaller precipitations are more tightly packed relative to parent material. The examination results show that steel 28MnTiNbVB exhibits limited weldability.

Author Information

Górka, Jacek
Welding Department, Silesian University of Technology, Faculty of Mechanical Engineering, Gliwice, Poland
Opiela, Marek
Institute of Engineering of Materials and Biomaterials, Faculty of Mechanical Engineering, Silesian University of Technology, Gliwice, Poland
Pages: 10
Price: $25.00
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Stock #: MPC20190059
ISSN: 2379-1365
DOI: 10.1520/MPC20190059