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Title: Effect of Ti Addition on the Microstructure and Mechanical Properties of Weld Metals in HSLA Steels

Abstract

Acicular ferrite (AF) can significantly improve the mechanical properties of steel welds. One practical approach to enhance the formation of AF is to provide the heterogonous nucleation sites such as Ti oxides. In this study, Ti was added to different conventional welding processes including shield metal arc welding (SMAW), submerged arc welding (SAW) and tandem SAW (T-SAW). In the SMAW process, TiO{sub 2} particles as a source of Ti were inserted into the weld groove, while in the SAW and the T-SAW processes, the Ti-enriched S2MoTB wire was used as the filler metal. The microstructural evolution of weldments was characterized by employing optical and scanning electron microscopes. In addition, microhardness (Vickers, HV), Charpy impact and tensile tests were carried out to investigate the mechanical properties of weldments. Although the microhardness measurements of all weldments did not vary significantly and were in the range of 205-252 HV, there was a considerable difference in tensile and impact properties of the SAW and the T-SAW weldments. In the SMAW process, the addition of TiO{sub 2} results in no significant enhancement in tensile and impact toughness. This can be attributed to the inhomogeneous distribution of TiO{sub 2} particles as well as the formation of largemore » inclusions in the structure. On the other hand, Ti addition to WM increased the yield strength from 489 to 552 MPa for the SAW process, and in contrast, it decreased the impact toughness from 75 to 33 J. This detrimental effect can be related to the higher deposition of other alloying elements in the WM and the formation of more ferrite side plate phase. By applying the T-SAW process, more Ti in WM led to a higher content of AF in the microstructure and increased both yield strength and impact toughness from 528 to 595 MPa and 100 to 180 J, respectively.« less

Authors:
;  [1]; ;  [2]
  1. Amirkabir University of Technology, Department of Mining and Metallurgical Engineering (Iran, Islamic Republic of)
  2. Graz University of Technology, Institute of Material Science, Joining and Forming (Austria)
Publication Date:
OSTI Identifier:
22863185
Resource Type:
Journal Article
Journal Name:
Journal of Materials Engineering and Performance
Additional Journal Information:
Journal Volume: 27; Journal Issue: 11; Other Information: Copyright (c) 2018 ASM International; http://www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1059-9495
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DEPOSITION; DISTRIBUTION; FERRITE; FILLER METALS; MICROHARDNESS; MICROSTRUCTURE; PRESSURE RANGE MEGA PA 100-1000; SCANNING ELECTRON MICROSCOPY; STEELS; SUBMERGED ARC WELDING; TITANIUM ADDITIONS; TITANIUM OXIDES; YIELD STRENGTH

Citation Formats

Pouriamanesh, Rasoul, Dehghani, Kamran, Vallant, Rudolf, and Enzinger, Norbert. Effect of Ti Addition on the Microstructure and Mechanical Properties of Weld Metals in HSLA Steels. United States: N. p., 2018. Web. doi:10.1007/S11665-018-3686-Y.
Pouriamanesh, Rasoul, Dehghani, Kamran, Vallant, Rudolf, & Enzinger, Norbert. Effect of Ti Addition on the Microstructure and Mechanical Properties of Weld Metals in HSLA Steels. United States. https://doi.org/10.1007/S11665-018-3686-Y
Pouriamanesh, Rasoul, Dehghani, Kamran, Vallant, Rudolf, and Enzinger, Norbert. 2018. "Effect of Ti Addition on the Microstructure and Mechanical Properties of Weld Metals in HSLA Steels". United States. https://doi.org/10.1007/S11665-018-3686-Y.
@article{osti_22863185,
title = {Effect of Ti Addition on the Microstructure and Mechanical Properties of Weld Metals in HSLA Steels},
author = {Pouriamanesh, Rasoul and Dehghani, Kamran and Vallant, Rudolf and Enzinger, Norbert},
abstractNote = {Acicular ferrite (AF) can significantly improve the mechanical properties of steel welds. One practical approach to enhance the formation of AF is to provide the heterogonous nucleation sites such as Ti oxides. In this study, Ti was added to different conventional welding processes including shield metal arc welding (SMAW), submerged arc welding (SAW) and tandem SAW (T-SAW). In the SMAW process, TiO{sub 2} particles as a source of Ti were inserted into the weld groove, while in the SAW and the T-SAW processes, the Ti-enriched S2MoTB wire was used as the filler metal. The microstructural evolution of weldments was characterized by employing optical and scanning electron microscopes. In addition, microhardness (Vickers, HV), Charpy impact and tensile tests were carried out to investigate the mechanical properties of weldments. Although the microhardness measurements of all weldments did not vary significantly and were in the range of 205-252 HV, there was a considerable difference in tensile and impact properties of the SAW and the T-SAW weldments. In the SMAW process, the addition of TiO{sub 2} results in no significant enhancement in tensile and impact toughness. This can be attributed to the inhomogeneous distribution of TiO{sub 2} particles as well as the formation of large inclusions in the structure. On the other hand, Ti addition to WM increased the yield strength from 489 to 552 MPa for the SAW process, and in contrast, it decreased the impact toughness from 75 to 33 J. This detrimental effect can be related to the higher deposition of other alloying elements in the WM and the formation of more ferrite side plate phase. By applying the T-SAW process, more Ti in WM led to a higher content of AF in the microstructure and increased both yield strength and impact toughness from 528 to 595 MPa and 100 to 180 J, respectively.},
doi = {10.1007/S11665-018-3686-Y},
url = {https://www.osti.gov/biblio/22863185}, journal = {Journal of Materials Engineering and Performance},
issn = {1059-9495},
number = 11,
volume = 27,
place = {United States},
year = {2018},
month = {11}
}