Abstract
This paper presents the analysis of the behavior of welded joints made of 9–12% Cr-Mo steel SA-387 Gr. 91. The successful application of this steel depends not only on the base metal’s (BM) properties but even more on heat-affected-zone (HAZ) and weld metal (WM), both at room and at operating temperature. Impact testing of specimens with a notch in BM, HAZ, and WM was performed on a Charpy instrumented pendulum to enable the separation of the total energy in crack-initiation and crack-propagation energy. Fracture toughness was also determined for all three zones, applying standard procedure at both temperatures. Results are analyzed to obtain a deep insight into steel SA 387 Gr. 91’s crack resistance properties at room and operating temperatures. Results are also compared with results obtained previously for A-387 Gr. B to assess the effect of an increased content of Chromium.
Highlights
The Cr-Mo steel SA-387 Gr. 91 belongs to a group of heat-and creep-resistant 9–12%Cr steels
Having in mind the importance and complexity of welded joints, it is of utmost importance to obtain a deep insight into the behavior of all zones to ensure the safe application and exploitation of Cr-Mo steel
This should include at least Charpy toughness and fracture toughness testing, both at room and elevated temperatures, up to 575 ◦ C, which is the aim of this research
Summary
The Cr-Mo steel SA-387 Gr. 91 belongs to a group of heat-and creep-resistant 9–12%Cr steels. Knowing that welded joint crack sensitivity increases, the more complex the composition and structure of a steel becomes, it is reasonable to assume that a complete overview of SA 387 Gr. 91 application must include a detailed analysis of its crack resistance in all welded joint zones. This should include at least Charpy toughness and fracture toughness testing, both at room and elevated temperatures, up to 575 ◦ C, which is the aim of this research
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