Carbide evolution and service life of simulated post weld heat treated 2.25Cr–1Mo steel

Jiangbiao, Chen; Liu, Huibin; Pan, Zhenya; Shi, K.; Zhang, Hanqian; Li, Jin-Fu

doi:10.1016/j.msea.2014.11.020

Cited by 25 publications

(6 citation statements)

References 31 publications

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“…The creep phenomenon is a process where permanent deformation occurs and increases with time under a constant applied stress which is lower than the yield strength. Plenty of studies on creep performance of traditional 2.25Cr1Mo steel and its welded joint have been carried out so far, including creep deformation and rupture behaviors, damage mechanism, and life prediction models [ 14 , 15 , 16 , 17 , 18 ]. Unfortunately, only a few studies reported the creep behavior of different zones in 2.25Cr1Mo0.25V steel weldments [ 19 , 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Tensile and Creep Behavior in a CrMoV Steel and Weld Metal

et al. 2021

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The 2.25Cr1Mo0.25V steel is a vanadium-modified 2.25Cr1Mo steel and is being widely used in the manufacture of heavy-wall hydrogenation reactors in petrochemical plants. However, the harsh service environment requires a thorough understanding of high-temperature tensile and creep behaviors of 2.25Cr1Mo0.25V steel and its weld for ensuring the safety and reliability of hydrogenation reactors. In this work, the high-temperature tensile and creep behaviors of base metal (BM) and weld metal (WM) in a 2.25Cr1Mo0.25V steel weldment used for a hydrogenation reactor were studied experimentally, paying special attention to its service temperature range of 350–500 °C. The uniaxial tensile tests under different temperatures show that the WM has higher strength and lower ductility than those of BM, due to the finer grain size in the WM. At the same time, the short-term creep tests at 550 °C reveal that the WM has a higher creep resistance than that of BM. Moreover, the creep damage mechanisms were clarified by observing the fracture surface and microstructures of crept specimens with the aid of scanning electron microscopy (SEM). The results showed that the creep damage mechanisms of both BM and WM are the initiation and growth of creep cavities at the second phase particles. Results from this work indicate that the mismatch in the high-temperature tensile strength, ductility, and creep deformation rate in 2.25Cr1Mo0.25V steel weldment needs to be considered for the design and integrity assessment of hydrogenation reactors.

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Section: Introductionmentioning

confidence: 99%

High-Temperature Tensile and Creep Behavior in a CrMoV Steel and Weld Metal

et al. 2021

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“…The behavior of alloy steels following carbide transformation during tempering has been widely studied, and has been reported for transformations such as M 3 C to MC [8], M 3 C to M 2 C [9,10], M 3 C to M 7 C 3 [11][12][13], M 3 C to M 23 C 6 [14,15], M 7 C 3 to M 23 C 6 [16,17], M 7 C 3 to M 6 C [18], MC to M 2 C [19], M 2 C to M 6 C [20] and M 23 C 6 to M 6 C [21]. Tsai and Yang [11] observed the transformation of M 3 C to M 7 C 3 in the martensitic region, resulting from the 'in situ nucleation' mechanism.…”

Section: Introductionmentioning

confidence: 99%

Carbide transformation behaviors of a Cr–Mo–V secondary hardening steel during over-ageing

Wang

et al. 2020

Mater. Res. Express

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The transformation of carbides in a 1.9Cr-1.4Mo-0.3 V secondary hardening steel that was subjected to over-ageing at 600°C-700°C has been investigated. The carbides were characterized using scanning electron microscope (SEM), x-ray diffraction (XRD), inductively coupled plasma-atomic emission spectrometry (ICP-AES), and transmission electron microscopy (TEM) preformed on carbon replicas. The results indicate that MC, M 2 C, and M 3 C were formed during over-ageing from 600 to 700°C, whereas M 7 C 3 , and M 23 C 6 started to be formed at 650 and 700°C, respectively. In addition, the co-existence of hexagonal and orthorhombic M 7 C 3 structures in a carbide particle was firstly observed. M 3 C was transformed to other carbides, and the formation of both M 2 C and M 23 C 6 may follow the 'separate nucleation' mechanism, whereas M 7 C 3 was transformed from M 3 C via the 'in situ nucleation' mechanism. The crystallographic orientation relationships between the in situ transformed M 7 C 3 and M 3

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“…Most of these applications require high mechanical strength, excellent resistance to fatigue, creep as well as oxidation at elevated temperatures. Owing to their high-temperature properties, heat-resistant steels [2,3] such as molybdenum-alloy steels [4][5][6][7] are extensively used as structural components in these applications. These materials experience cyclic mechanical and thermal stresses in their service regime [8,9].…”

Section: Introductionmentioning

confidence: 99%

Differences in service-exposed and artificially aged microstructure and tensile properties of ASTM A204 Grade C steel

Sharma

Wang

et al. 2020

Materials Science and Technology

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Microstructural characterisation of artificially aged and service-exposed ASTM A204 Grade C steel reveals changes in the cementite particles of pearlite and microstructure. The ageing temperatures were chosen to be high enough to replicate the service degradation but below Ac1 to avoid austenitisation in the inter-critical regime. Tensile testing of artificially aged materials shows a decrease in the ultimate tensile strength (UTS) along with an increase in elongation. On the other hand, service-exposed material resulted in an increase in UTS and a decrease in elongation. The softening of pearlite due to spheroidisation of cementite and segregation of alloying elements towards grain boundaries were responsible for the lower UTS of the artificially aged samples. Whereas, the increase in UTS in the service-exposed sample was attributed to the formation of nano-sized carbides inside ferrite grains, hence strengthening the steel matrix.

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Carbide evolution and service life of simulated post weld heat treated 2.25Cr–1Mo steel

Cited by 25 publications

References 31 publications

High-Temperature Tensile and Creep Behavior in a CrMoV Steel and Weld Metal

High-Temperature Tensile and Creep Behavior in a CrMoV Steel and Weld Metal

Carbide transformation behaviors of a Cr–Mo–V secondary hardening steel during over-ageing

Differences in service-exposed and artificially aged microstructure and tensile properties of ASTM A204 Grade C steel

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