Influence and assessment of mechanical properties on treated P91 steel with normalizing processes

Krishna, A. Rohit Sai; Krishna, B.V. Raghu Vamshi; Sashank, Tallapragada V.S.S.P.; Harshith, D.N.; Subbiah, Ram

doi:10.1016/j.matpr.2020.03.201

Cited by 52 publications

(1 citation statement)

References 15 publications

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“…P91 grade can be considered as an evolution of the P22 grade, which it came to replace, being able to assume different designations, such as T91 (corresponding to the seamless tube) and P91 (when in the form of seamless pipe), ASTM A335 for plates, according to ASTM, or X10CrMoVNb9-1 according to BS EN 10216-2 [11]. Indeed, P91 grade presents excellent properties, such as high strength even under elevated temperatures, good corrosion resistance, stress-corrosion crack resistance, low thermal expansion, high thermal conductivity, and good weldability, thus having the main properties required by the most demanding applications mentioned above [12,13]. In fact, the excellent mechanical strength at high temperatures comes from martensite transformation induced dislocations, tempered martensite lath structure, boundary strengthening, as well as the formation of M 23 C 6 precipitates.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Heat Treatment Conditions of Joints in Grade P91 Steel: Looking for More Sustainable Solutions

Sousa

Silva

Pinho

et al. 2021

Metals

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Grade P91 is a relatively new class of steel, which has received special attention from designers because it presents extremely interesting characteristics for specific applications. This steel exhibits ideal properties for demanding applications, especially involving high temperature and pressure, being employed in facilities such as power plants and other equipment, such as heat exchangers. P91 welds usually need heat treatments, which are already parameterized in the codes. However, standardized treatments are time-consuming and harmful to the environment, as they massively consume energy. Some attempts have been made in the past to reduce the time and energy spent on these treatments. This work aims to extend this study, now presenting better solutions than those obtained previously. This work presents four new conditions for the heat treatment of joints carried out on P91 steel, with a view to reducing processing time, reducing energy consumption, and an even better balance between mechanical strength and elongation after failure. Heat treatment conditions were established in which there was a loss of about 14% in Ultimate Tensile Strength (UTS), but in which a gain of about 50% in elongation was obtained, compared to welding without any treatment, but also with 10% losses in the UTS and 30% gains in elongation when compared to the solution recommended as more correct in the codes, saving a lot of time and energy in the treatment process. Thus, these solutions may be adopted in the future with gains in terms of productivity and economic and environmental sustainability.

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Section: Introductionmentioning

confidence: 99%