Influence of the Annealing Time After Welding on the Mechanical Properties of Welded Joint of T91 Steel

Wojsyk, Kwiryn; Golański, G.; Jasak, J.; Słania, Jacek; Zieliński, Andrzej; Urbańczyk, Paweł

doi:10.1515/amm-2016-0233

Cited by 13 publications

(10 citation statements)

References 8 publications

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“…The process of changes in the performance of these materials, and in their microstructure, is described by the materials characteristics. These characteristics, in combination with other methods for assessing their exhaustion degree, are utilized in generating a safe product, operating both within and beyond the design service time [12,13,14].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Inconel 740H after Long-Term Service

2018

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Inconel 740H is a nickel-based alloy for pressure components of ultra-supercritical boilers. Its chemical composition and strengthened matrix, as well as corrosion resistance, provide the highest creep resistance among the materials recommended for use in high-performance pressure components of power units. This paper investigates the changes in the microstructure and mechanical properties after ageing at 700 and 750 °C for 1000, 10,000, 20,000, and 30,000 h. Observation of the microstructure was performed using scanning and transmission electron microscopy. The identification of existing precipitates was conducted by X-ray phase analysis. The effects of time and ageing at elevated temperatures on the mechanical properties and precipitation process in the test alloy are discussed. The presented results are part of the material characteristics of the new-generation alloys to be used in the design of pressure equipment for steam boilers, as well as in diagnostic work during operation.

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Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Inconel 740H after Long-Term Service

2018

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“…It has been pointed out that fine lath martensite with undissolved M 23 C 6 and MX particles, along with Cr-rich ferrite, are formed in the FGHAZ of a modified 9Cr-1Mo steel weld heated to temperatures between A C1 and A C3 . [23,34,38]. Under the as-simulated condition, most M 23 C 6 carbides heated to slightly below the A C3 temperature dissolve into the matrix, and few residual carbides remain [23,24].…”

Section: Resultsmentioning

confidence: 97%

“…After infrared heating, the simulated specimens were tempered at 1033 K for 2 h to meet the requirement of post-weld heat treatment of a T92 weld. It has been reported that short-time annealing at 750 • C can be applied to thin-walled T91 steel welds [34]. Regarding the thermally simulated samples, and for the LT-OT sample, the LT sample, which was previously normalized at 1213 K and then tempered at 1033 K, was heated to 1133 K for 1 min by infrared heating, followed by tempering at 1033 K for 2 h. For the HT-PT sample, the HT sample was heated to 1173 K for 1 min and then tempered at 1033 K for 2 h.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Microstructural Evolution and Short-Term Creep Rupture of the Simulated HAZ in T92 Steel Normalized at Different Temperatures

Liao

Chen

et al. 2019

Metals

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T92 steel tubes have been widely applied in advanced supercritical boilers to replace Gr.91 tubes. Simulated samples with microstructures similar to those present in the heat-affected zone (HAZ) of a T92 steel weld were subjected to short-term creep tests in the study. T92 steel tubes were normalized at either 1213 K (L) or 1333 K (H) for 1 h, followed by tempering (T) at 1033 K for 2 h. After the normalizing and tempering treatments, the HT samples comprised finer precipitates but in greater numbers along the prior austenite grain boundaries (PAGBs) and martensite lath boundaries, as compared with those of the LT samples. The HAZ microstructures in the T92 steel welds were simulated by using an infrared heating system, which included over-tempering (OT, below AC1) and partial transformation (PT, slightly below AC3) zones. Martensite laths in the OT sample were more likely to be replaced by numerous cellular structures or subgrains together with spherodized carbides mainly located at the lath and austenite grain boundaries. Furthermore, coarser but fewer carbides were found along the refined lath and grain boundaries in the PT samples, in comparison with other samples in each group. Short-term creep tests showed that the PT samples were more likely to fracture than other samples in each group. Moreover, under the same testing conditions, the microstructures of T92 steel were more stable and resistant to degradation than those of T91 steel after welding or loading at elevated temperatures. Such events were responsible for higher creep resistance of the simulated T92 samples than that of the simulated T91 samples under the same creep-rupture conditions.

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“…In addition, this development stimulates the fact that the growth of alternative energy technologies, which has been promoted for years, indicates that they will not be yet, in a long time, the primary source of energy not only in Poland but also in the world. Therefore, the above information clearly indicates that work on the development of new materials for the hightemperature power industry and related technologies for the manufacture of finished components cannot be neglected [1][2][3][4]. The directions of the national power industry development are also forced by the geopolitical conditions of the country.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Long-Term Ageing on the Degradation of the Microstructure the Inconel 740h Alloy

et al. 2020

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The Inconel 740H alloy is used in the construction of pressure components of ultra-supercritical operating parameters. The paper presents the results of microstructure analysis after 1000 and 10 000 h ageing at 700 and 750 • C. Microstructure studies were made using scanning and transmission electron microscopy. Identification of precipitations was made using X-ray analysis of phase composition. The influence of ageing time on changes in microstructure and the precipitation process of the tested alloy were described. Presented research results are a material characteristic of new generation materials, which are used in the design of elements of pressure parts of boilers and diagnostics work during operation.

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Influence of the Annealing Time After Welding on the Mechanical Properties of Welded Joint of T91 Steel

Cited by 13 publications

References 8 publications

Microstructure and Mechanical Properties of Inconel 740H after Long-Term Service

Microstructure and Mechanical Properties of Inconel 740H after Long-Term Service

Microstructural Evolution and Short-Term Creep Rupture of the Simulated HAZ in T92 Steel Normalized at Different Temperatures

The Effect of Long-Term Ageing on the Degradation of the Microstructure the Inconel 740h Alloy

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