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Microstructure and mechanical properties of 9Cr-1Mo steel weld fusion zones as a function of weld metal composition
Published in
2009
Volume: 18
   
Issue: 8
Pages: 999 - 1004
Abstract
Modified 9Cr-1Mo steel, designated as P91, is widely used in the construction of power plants and other sectors involving temperatures higher than 500 °C. Although the creep strength is the prime consideration for elevated temperature applications, notch toughness is also important, especially for welded components, as it is essential to meet the pressure test and other requirements at room temperature. P91 steel weld fusion zone toughness depends on factors such as welding process, chemical composition, and flux composition. Niobium and vanadium are the main alloying elements that significantly influence the toughness as well as creep strength. In the current work, weld metals were produced with varying amounts of niobium and vanadium by dissimilar joints involving P9 and P91 base metals as well as filler materials. Microstructural studies and Charpy V-notch impact testing were carried out on welds to understand the factors influencing toughness. Based on the results, it can be concluded that by reducing vanadium and niobium weld metal toughness can be improved. © ASM International.
About the journal
JournalJournal of Materials Engineering and Performance
ISSN10599495
Open AccessNo
Concepts (30)
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    Base metals
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    CHARPY V NOTCHES
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    Chemical compositions
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    CREEP STRENGTHS
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    DISSIMILAR JOINTS
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    Elevated temperature
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    FILLER MATERIALS
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    FLUX COMPOSITION
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    Micro-structural
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    Microstructure and mechanical properties
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    Modified 9cr-1mo steel
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    NOTCH TOUGHNESS
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    P91 steel
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    PRESSURE TESTS
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    Room temperature
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    STEEL WELDS
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    Weld metal
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    WELDED COMPONENTS
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    Welding process
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    Alloying elements
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    Creep
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    Dissimilar materials
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    Hardness
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    Mechanical properties
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    Microstructure
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    Niobium
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    Toughness
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    Vanadium
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    Welded steel structures
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    Joints (structural components)