Assessment of the Residual Life of Steam Pipeline Material beyond the Computational Working Time

Sroka, M.; Zieliński, A.; Dziuba-Kałuża, M.; Kremzer, M.; Macek, M.; Jasiński, A.

doi:10.3390/met7030082

Cited by 24 publications

(16 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As a result of the process, their shapes and dimensions change constantly during service. After the elapse of sufficient time of working under creep conditions, the components are degraded and their further service is prevented [3][4][5]. The degradation processes start at the moment when the rate of strain changes from its minimum and proportional values to disproportional ones as it is increasing [6].…”

Section: Introductionmentioning

confidence: 99%

Introductory Chapter: Creep - An Overview of New Research Results

Zieliński¹,

Sroka²,

Tański³

et al. 2020

Creep Characteristics of Engineering Materials

Self Cite

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Introductory Chapter: Creep - An Overview of New Research Results

Zieliński¹,

Sroka²,

Tański³

et al. 2020

Creep Characteristics of Engineering Materials

Self Cite

View full text Add to dashboard Cite

“…Such a dual alloy shaft can be manufactured by welding, however, it requires a long production cycle [1]. Numerous creep tests indicate that elevated temperature and high pressure have a fatal impact on the life of the material due to the degradation of material structure during service under harsh conditions [2][3][4]. In order to improve the dual alloy single shaft quality and yield, ESR can be applied to produce dual alloy shaft.…”

Section: Introductionmentioning

confidence: 99%

Effect of Current on Structure and Macrosegregation in Dual Alloy Ingot Processed by Electroslag Remelting

Liu

Zhang

et al. 2017

Metals

View full text Add to dashboard Cite

Macrosegregation is a very common problem for the quality control of all cast ingots. The effect of current on the structure and macrosegregation in dual alloy ingot processed by electroslag remelting (ESR) was investigated experimentally with various analytical methods. In this study, the electrode consisted of NiCrMoV alloy bar (upper part) and CrMoV alloy (lower part) with a diameter of 55 mm, was remelted in a laboratory-scale ESR furnace with the slag containing 30 mass pct alumina and 70 mass pct calcium fluoride under an open air atmosphere. The results show that the macrostructures of three ingots processed by electroslagremelting with different currents are nearly similar. The thin equiaxed grains region and the columnar grains region are formed under the ingot surface, the latter region is the dominant part of the ingot. The typical columnar structure shows no discontinuity among the NiCrMoV alloy zone, the CrMoV alloy zone, and the transition zone in three ingots. With the increase of the current, the grain growth angle increases due to the deeper molten metal pool. The secondary dendrite arm spacing (SDAS) firstly decreases, then increases. The SDAS is dominated by the combined effect of the local solidification rate and the width of mushy region. With the current increasing from 1500 A to 1800 A and 2100 A, the width of the transition zone decreases from 147 mm to 115 mm and 102 mm. The macrosegregation becomes more severe due to the fiercer flows forced by the Lorentz force and the thermal buoyancy force. The cooling rate firstly increases, then decreases, due to the effect of the flows between the mushy region and metal pool and the temperature gradient at the mushy zone of the solidification front. With a current of 1800 A, the SDAS is the smallest and cooling rate is the fastest, indicating that less dendrite segregation and finer precipitates exist in the ingot. Under the comprehensive consideration, the dual alloy ingot processed by the ESR with a current of 1800 A is the best because it has the smallest SDAS, the appropriate grain growth angle, moderate macrosegregation and thickness of the transition zone.

show abstract

“…Zn-Al4 (385-418°C) or AlSi12 (573-585°C). However, substantial problem in this type of joints are cracks frequently occurring in braze filler metal near protective zinc layer on steel sheet [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

A Study of Susceptibility and Evaluation of Causes of Cracks Formation in Braze-Weld Filler Metal in Lap Joints Aluminum – Carbon Steel Made with Use of CMT Method and High Power Diode Laser

Adamiak¹,

Wyględacz²,

Czupryński³

et al. 2017

Archives of Metallurgy and Materials

View full text Add to dashboard Cite

In this article results of studies on cracks formation susceptibility in braze-welded joints of thin aluminum sheets and doublesided zinc galvanized steel sheets for car body parts made by laser brazing with high power diode laser ROFIN DL 020 and CMT MIG-brazing, with filler material in form of powder and wire accordingly, were presented. Optimal welding parameters were determined by visual acceptance criteria. On joints made with optimal parameters further examinations were carried. Results of macro-and microscopic metallographic examinations, structural roentgenography, EDS microanalysis and hardness tests were presented. Causes of brittle intermetallic Fe-Al phases formation in Al-matrix filler metal in dissimilar aluminum -zinc plated carbon steel joints were pointed.

show abstract

Assessment of the Residual Life of Steam Pipeline Material beyond the Computational Working Time

Cited by 24 publications

References 16 publications

Introductory Chapter: Creep - An Overview of New Research Results

Introductory Chapter: Creep - An Overview of New Research Results

Effect of Current on Structure and Macrosegregation in Dual Alloy Ingot Processed by Electroslag Remelting

A Study of Susceptibility and Evaluation of Causes of Cracks Formation in Braze-Weld Filler Metal in Lap Joints Aluminum – Carbon Steel Made with Use of CMT Method and High Power Diode Laser

Contact Info

Product

Resources

About