Wyniki wyszukiwania - BazTech

Ograniczanie wyników

1 Journal of Achievements in Materials and Manufacturing Engineering

1 2007

Znaleziono wyników: 1

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: SIROQUANT(TM)

Sortuj według:

Ogranicz wyniki do:

Development of the precipitation processes in low-alloy Cr-Mo type steel for evolution of the material state after exceeding the assessed lifetime

Dobrzański J., Krztoń H., Zieliński A.

Journal of Achievements in Materials and Manufacturing Engineering

2007

Vol. 23, nr 2

19-22

Purpose: of this paper is to present the changes of the structure and of the carbides composition in material components made of 13CrMo44 after long term service in creep conditions. Design/methodology/approach: The material of the research studies has been obtained from Polish power stations. All examined elements have exceeded their assessed life of 100,000 hours. The microstructures of the elements have been observed using a scanning electron microscope. The mechanical properties and hardness values have been obtained. X-ray diffraction has been used for identification of carbides. The Rietveld method has been applied to calculate factions of the carbides. Findings: The correlation between changes in the carbides' composition and equivalent service time and exhaustion extent has been presented. Practical implications: The presented method can be used for evaluation and qualification of structural changes in power station boiler components operating in creep conditions. Originality/value: The application of the Rietveld method for quantification of the carbides for evaluation of the state of the material being in operating conditions.