Development of a standard methodology for the correlation and extrapolation of elevated temperature creep and rupture data. Volume 2:  a state-of-the-art review. Final report

Goldhoff, R.M.

doi:10.2172/6139262

Cited by 5 publications

(1 citation statement)

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“…; where r act is actual rupture stress for a given creep rupture time and r pre is extrapolation strength for the same creep lifetime predicted by one of methods. In light of reports [29,30], the root mean square (RMS) was used to estimate the precision of several TPP prediction methods, which can be expressed as RMS =…”

Section: Wilshire Equationsmentioning

confidence: 99%

Creep Behavior and Life Assessment of a Novel Heat-Resistant Austenite Steel and Its Weldment

Jing

Han

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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In the present study, creep activation energy for rupture was obtained as 221-348 kJ/mol for 22Cr15Ni3.5CuNbN due to the precipitation-hardening mechanism. The extrapolation strength of creep rupture time of 10 5 h at 923 K for 22Cr15Ni3.5CuNbN is more valid (83.71 MPa) predicted by the Manson-Haferd method, which is superior to other commercial heat-resistant steels. The tensile creep tests ranging from 180 to 240 MPa at 923 K were conducted to investigate creep deformation behavior of welded joint between a novel heat-resistant austenite steel 22Cr15Ni3.5CuNbN and ERNiCrCoMo-1 weld metal. Apparent stress exponent value of 6.54 was obtained, which indicated that the ratecontrolled creep occurred in weldment during creep. A damage tolerance factor of 6.4 in the weldment illustrates that the microstructural degradation is the dominant creep damaging mechanism in the alloy. Meanwhile, the welded joints perform two types of deformation behavior with the variation in applied stress, which resulted from the different parts that govern the creep processing. Also, the morphology evolution of the fracture surfaces confirms the effects of stress level and stress state. Keywords Heat-resistant steel weldment Á Creep deformation Á Life assessment Á TTP (time-temperature parametric) method Recent researches on life assessment of high-temperature alloys used in power plants, nevertheless, mainly converge on grades 91 and 92 [9-13]. The long-term lifetime extrapolation and allowable stress calculation are particularly inadequate for newly developed high-temperature steel. Meanwhile, welding is an inevitable processing

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Section: Wilshire Equationsmentioning

confidence: 99%