2018
DOI: 10.3390/met8121072
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The Effect of Normalizing Temperature on the Short-Term Creep Rupture of the Simulated HAZ in Gr.91 Steel Welds

Abstract: As-received Gr.91 steel tube was normalized at either 940 or 1060 • C for 1 h, followed by Ar-assisted cooling to room temperature, then tempered at 760 • C for 2 h. Those samples were designated as 940NT or 1060NT samples. An infrared heating system was used to simulate HAZ microstructures in the weld, which included over-tempering (OT) and partial transformation (PT) zones. The results of short-term creep tests showed that normalizing at higher temperature improved the creep resistance of the Gr.91 steel. By… Show more

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Cited by 7 publications
(13 citation statements)
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“…T92 steel tubes have been widely used in advanced supercritical boilers to replace Gr.91 tubes. As reported in prior works, the simulated HAZ microstructures of Gr.91 steel are sensitive to thermal cycles [24,29]. Moreover, normalizing Gr.91 steel at higher temperature is beneficial to improving its creep resistance [29].…”
Section: Introductionsupporting
confidence: 52%
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“…T92 steel tubes have been widely used in advanced supercritical boilers to replace Gr.91 tubes. As reported in prior works, the simulated HAZ microstructures of Gr.91 steel are sensitive to thermal cycles [24,29]. Moreover, normalizing Gr.91 steel at higher temperature is beneficial to improving its creep resistance [29].…”
Section: Introductionsupporting
confidence: 52%
“…As reported in prior works, the simulated HAZ microstructures of Gr.91 steel are sensitive to thermal cycles [24,29]. Moreover, normalizing Gr.91 steel at higher temperature is beneficial to improving its creep resistance [29]. To date, the microstructural evolutions and short-term creep tests of simulated HAZs present in a T92 steel weld have not been studied extensively.…”
Section: Introductionmentioning
confidence: 95%
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“…The paper by Wu et al [11] deals with the effect of heat treatment process parameters, and specifically the normalizing temperature, in grade 91, a 9-12% Cr steel, which is discussed on the basis of a careful microstructural analysis of crept samples. Other critical features for the industrial applications of these steels have been considered in the Issue, such as weld joint behaviour (Hu et al [5] investigated the effect of residual stresses left by these processes on creep damage) or creep-fatigue and creep relaxation phenomena (Jürgens et al [10]).…”
Section: Creep-microstructure Correlations For Specific Materials Classesmentioning
confidence: 99%