Microstructural Evolution and the Effect on Mechanical Properties of S30432 Heat-resistant Steel during Aging at 650°C

Zhang, Yujie; Zhu, Lihui; An-fang, QI; Lu, Zhengran

doi:10.2355/isijinternational.50.596

Cited by 25 publications

(6 citation statements)

References 10 publications

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“…Figure 4 shows TEM micrograph and the selected area electron diffraction (SAED) of the untreated S30432 supreheater pipe. Some fine particles disperse along the grain boundaries and SAED confirms that they are M 23 C 6 phase particles, as shown in Figure 4a–d shows that in the grain there are some fine particles with the uniform size of about 100 nm and SAED proves that they are MX phase particles which is considered as Nb(C,N) 5, 13, 14…”

Section: Resultsmentioning

confidence: 77%

Research on Microstructure and Mechanical Property of S30432 Supreheater Pipe Aged at 700°C

Liang

Zhao

et al. 2012

steel research int.

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The microstructure and performance of S30432 supreheater pipe were investigated before and after it is aged 3000 h at 700°C. A lot of twins disappeared after aging, M23C6 particles precipitated along the grain boundary and MX particles precipitated near the dislocation. After the endurance experiment of the aged pipe, M23C6 precipitations with the size of about 50 nm pinned dislocations and the cavity appeared on the grain boundary. The aged S30432 supreheater pipe showed the ductile fracture. Increasing temperature made the inter‐granular fracture transfer the quasi‐cleavage fracture and the equiaxed morphology change the parabola morphology. The strength of the untreated specimen decreased with the temperature increasing. The hardness and the impact energy of the aged specimen were larger than those of the untreated specimen. Tensile strength and elongation of untreated specimen were larger than that of aged specimen.

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Section: Resultsmentioning

confidence: 77%

Research on Microstructure and Mechanical Property of S30432 Supreheater Pipe Aged at 700°C

Liang

Zhao

et al. 2012

steel research int.

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“…(2) SUPPL 1 S1-107 4(K/Na) 3 Fe(SO 4 ) 3 + 12Fe 3Fe 3 O 4 + 2Fe 2 O 3 + 6(K/Na) 2 SO 4 + 3FeS + 3SO 2 (3) In addition, alkali sulphates with a deposit can result in sulphidation and oxidation (see equations (4) and (5)) 4(Fe/Cr) + 3O 2 2(Fe/Cr) 2 …”

Section: Discussionmentioning

confidence: 98%

“…1,[2][3][4][5] However, it is impossible to large-scale use for Super304H, because of the limited production. To substitute Super304H, 0Cr18Ni9NbCu3BN steel is developed to meet the increasing needs for power plants in China. Up to now, many investigations on 0Cr18Ni9NbCu3BN have been carried out.…”

Section: Introductionmentioning

confidence: 99%

Analysis on high-temperature corrosion characteristic of 0Cr18Ni9NbCu3BN steel

Wang

Zhao

Liang

et al. 2015

Materials Research Innovations

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The high-temperature corrosion characteristic of 0Cr18Ni9NbCu3BN steel was analysed in this paper. The samples were selected from a super-heater with service time of 34 696 h in an ultrasupercritical boiler in China. Scanning electron microscopy, energy spectrum analysis and energy dispersive X-ray spectroscopy were adopted to analyse the element constitute, morphology and phase structure of the corrosion scale. The results indicated that corrosion scale can be divided into three layers, and the middle layer of corrosion scale is enriched with Cr. The Cr-rich layer could not set an efficient barrier to prevent sulphur from penetrating to the matrix. It actually can prevent O from penetrating to metal base effectively. The main corrosion forms are high-temperature oxidation and sulphidation, while the sulphidation rate was greater than the oxidation rate. The sulphidation is the major type of corrosion attack. Oxidation and sulphidation interactively cause the corrosion progress consistently.

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“…At low temperature or early aging stage, combined with the calculation of microstructure and particle coarsening rate, it can be seen that the particles keep small size and have enough stability, and then increase the volume fraction f of the second phase, so it has a significant strengthening effect. The microstructure observation shows that the coarsening rate increases with the increase of temperature or time, the precipitation amount and volume fraction of particles decrease and the average free path λ increases, which leads to the decrease of the pinning effect of particles on dislocations in the plastic deformation process of the whole system [39]. Figure 12 shows the tensile fracture morphology of steel plate under different heat treatment conditions.…”

Section: Effect Of Precipitates On Mechanical Propertiesmentioning

confidence: 99%

The Effect of Aging on Precipitates, Mechanical and Magnetic Properties of Fe-21Cr-15Ni-6Mn-Nb Low Magnetic Stainless Steel

Dong

et al. 2021

Metals

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The effect of aging on the precipitates, mechanical and magnetic properties of Fe-21Cr-15Ni-6Mn-Nb low magnetic stainless steel were investigated. The steel was aged at 550–750 °C for 2 h after solution heat treatment at 1100 °C for 1 h. During the aging treatment, the (Nb, V)(C, N) particles gradually precipitated in the grain, which were coherent or semi-coherent with the matrix. When the aging temperature was beyond 650 °C, the coarsening rate of (Nb, V)(C, N) particles increase rapidly and the coherent orientation between (Nb, V)(C, N) particles and the matrix was lost gradually. Meanwhile, coarse M23C6 was distributed at the grain boundary with chain shape, which was non-coherent with the matrix. The coarsening behavior of (Nb, V)(C, N) precipitates in the grain was analyzed, and the size of the particles precipitated after aging treatment at 650°C for different time was calculated and studied. After aging treatment at 650 °C for 2 h, the yield strength and tensile strength of the stainless steel was 705.6 MPa and 1002.3 MPa, the elongation and the relative magnetic permeability was 37.8% and 1.0035, respectively.

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Microstructural Evolution and the Effect on Mechanical Properties of S30432 Heat-resistant Steel during Aging at 650°C

Cited by 25 publications

References 10 publications

Research on Microstructure and Mechanical Property of S30432 Supreheater Pipe Aged at 700°C

Research on Microstructure and Mechanical Property of S30432 Supreheater Pipe Aged at 700°C

Analysis on high-temperature corrosion characteristic of 0Cr18Ni9NbCu3BN steel

The Effect of Aging on Precipitates, Mechanical and Magnetic Properties of Fe-21Cr-15Ni-6Mn-Nb Low Magnetic Stainless Steel

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