<abstract xmlns="http://www.w3.org/1999/xhtml"><p>The paper presents results of microstructure and mechanical properties investigation of laser beam welded high-strength steel. Material for test was non-alloyed steel with yield strength of 690 MPa after quenching and tempering in delivery condition. Research carried out on the butt-welded joints shows fine-grain martensitic-bainitic structure of base metal and in the weld. Investigations of mechanical properties revealed the softened zone in HAZ where the hardness decrease without microstructural changes was observed. Moreover, an influence of softened zone and HAZ width on impact strength was observed where the occurrence of lower hardness led to fracture path deviation phenomenon.</p></abstract>

The paper presents results of microstructure and mechanical properties investigation of laser beam welded high-strength steel. Material for test was non-alloyed steel with yield strength of 690 MPa after quenching and tempering in delivery condition. Research carried out on the butt-welded joints shows fine-grain martensitic-bainitic structure of base metal and in the weld. Investigations of mechanical properties revealed the softened zone in HAZ where the hardness decrease without microstructural changes was observed. Moreover, an influence of softened zone and HAZ width on impact strength was observed where the occurrence of lower hardness led to fracture path deviation phenomenon.

Evaluation of Microstructure and Selected Mechanical Properties of Laser Beam Welded S690QL High-Strength Steel

AGH University of Science and Technology in Krakow

Faculty Metals Engineering and Industrial Computer Science, Department of Physical Metallurgy & Powder Metallurgy

Advances in Materials Science

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

The paper presents results of microstructure and mechanical properties investigation of laser beam welded high-strength steel. Material for test was...

Evaluation of Microstructure and Selected Mechanical Properties of Laser Beam Welded S690QL High-Strength Steel

Published Online: Oct 29, 2018

Page range: 34 - 42

DOI: https://doi.org/10.1515/adms-2017-0039

Keywords
high-strength steel, microstructure, laser welding

© 2018 L. Tuz, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Evaluation of Microstructure and Selected Mechanical Properties of Laser Beam Welded S690QL High-Strength Steel

Published Online: Oct 29, 2018

Page range: 34 - 42

DOI: https://doi.org/10.1515/adms-2017-0039

Keywordshigh-strength steel, microstructure, laser welding

© 2018 L. Tuz, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
high-strength steel, microstructure, laser welding