Influence of Temperature and Operation Time on the Fatigue Strength and Microstructure of Welded Joints of A-387Gr.B Steel

The main aim of our paper is to analyze the influence of temperature and service time on the fracture resistance of welded joint constituents for new and exploited low-alloyed A-387Gr.B steel (Cr–Mo type) under the action of dynamic load and changes in the mechanical properties. The exploited parent...

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Bibliographic Details
Published in:Materials science (New York, N.Y.) N.Y.), 2021-07, Vol.57 (1), p.86-93
Main Authors: Camagic, I, Jovic, S, Makragic, S, Zivkovic, P, Burzic, Z
Format: Article
Language:English
Subjects:
Alloying
Analysis
Base metal
Characterization and Evaluation of Materials
Chemistry and Materials Science
Chromium
Crack initiation
Dynamic loads
Fatigue
Fatigue failure
Fatigue strength
Fatigue testing machines
Fracture toughness
Heat affected zone
Low alloy steels
Materials
Materials Science
Mechanical properties
Metal fatigue
Microstructure
Molybdenum
Solid Mechanics
Steel constituents
Structural Materials
Weld metal
Welded joints
Welding
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Summary:The main aim of our paper is to analyze the influence of temperature and service time on the fracture resistance of welded joint constituents for new and exploited low-alloyed A-387Gr.B steel (Cr–Mo type) under the action of dynamic load and changes in the mechanical properties. The exploited parent metal, as a part of the reactor mantle, is in the damage repair stage, i.e., a part of its mantle is replaced with a new material. Wohler’s curves were constructed, i.e., the fatigue strength as material resistance to crack initiation, was determined at the room and working temperatures. Testing of the welded joint and microstructural analyses of the parent metal, weld metal, and the heat-affected zones were carried out. Based on the testing results, the analysis of the fracture resistance, and the microstructural changes, represent the comparison of values obtained for the characteristic areas of the welded joint and the justification of the selected technology of welding.
ISSN:1068-820X
1573-885X
DOI:10.1007/s11003-021-00518-1