Microstructural evolution and mechanical behavior of activated tungsten inert gas welded joint between P91 steel and Incoloy 800HT - Publication - Bridge of Knowledge

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Microstructural evolution and mechanical behavior of activated tungsten inert gas welded joint between P91 steel and Incoloy 800HT

Abstract

This study examines the welded joint between P91 steel and Incoloy 800HT using the Activated Tungsten Inert Gas (A-TIG) welding process. The focus is on analyzing the microstructure and evaluating the mechanical properties of joints made with different compositions of activating flux. Owing to the reversal of the Marangoni effect in which the conventional direction of molten metal flow in the weld pool is reversed due to the application of oxide-based fluxes, a complete depth of penetration of 8 mm was successfully achieved. Conducting mechanical tests, such as microhardness, tensile, and Charpy impact toughness tests, elucidates the behavior of the welded specimens under different loading conditions. The findings highlight the effects of grain size, dislocations, and the evolution of fine-sized precipitates in the high-temperature matrix. This study highlights the importance of choosing suitable flux compositions to achieve consistent penetration and dilution in the base metals. Insights into different failure modes and the influence of temperature on the tensile strength were evaluated. Beneficial mechanical properties of the joints (meeting the criteria of ISO and ASTM standards) were found: ultimate tensile strength of 585 ± 5 MPa, elongation 38 ± 2%, impact toughness of 96  5 J, and maximum microhardness of 345 ± 5 HV.

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Category:
Articles
Type:
artykuły w czasopismach
Published in:
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY no. 134, pages 223 - 244,
ISSN: 0268-3768
Language:
English
Publication year:
2024
Bibliographic description:
Bhanu V., Manoj J., Gupta A., Fydrych D., Pandey C.: Microstructural evolution and mechanical behavior of activated tungsten inert gas welded joint between P91 steel and Incoloy 800HT// INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY -,iss. 1-2 (2024), s.223-244
DOI:
Digital Object Identifier (open in new tab) 10.1007/s00170-024-14117-2
Sources of funding:
  • Free publication
Verified by:
Gdańsk University of Technology

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