Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 Archives of Materials Science and Engineering

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: 14MoV6-3 steel

Sortuj według:

Ogranicz wyniki do:

The evaluation of suitability for operation of low-alloy Cr-Mo and Cr-Mo-V steel welded joints beyond the design work time

Dziuba-Kałuża M., Zieliński A., Dobrzański J., Sroka M.

Archives of Materials Science and Engineering

2014

Vol. 66, nr 1

21--30

Purpose: The purpose of this paper was to develop material characteristics for homogeneous circumferential welded joints in low-alloy steel steam pipelines of power units after long-term service beyond the design work time. Design/methodology/approach: The investigations of microstructure using scanning microscopy, investigations of mechanical properties at room and elevated temperature, in particular the static tensile test, determination of brittle fracture appearance transition temperature based on the impact strength tests and abridged creep tests without measurement of elongation during test were carried out in order to determine the residual life of the material. Findings: The influence of long-term service on mechanical properties and structure of 13CrMo4-5 and 14MoV6-3 steel circumferential welded joints after long-term service under creep conditions beyond the design work time was determined. Practical implications: The applied methodology and adopted procedures will be used for evaluation of condition and prediction about further operation of welded joints of elements in the pressure part of power equipment working under creep conditions. Originality/value: The obtained results of investigations will be the elements of material characteristics developed by the Institute for Ferrous Metallurgy for steels and welded joints made from them working under creep conditions.

Structure of welded joints of 14MoV6-3 and 13CrMo4-5 steel elements after design work time under creep conditions

Zieliński A., Dobrzański J., Dziuba-Kałuża M.

Archives of Materials Science and Engineering

2013

Vol. 61, nr 2

69--76

Purpose: This paper is to present changes in the structure of material of 14MoV6-3 and 13CrMo4-5 alloyed steel components of power station boiler after long-term creep service. Design/methodology/approach: The investigated materials were obtained from Polish power stations. All the examined elements have exceeded their assessed life of 100 000 hours. The structural investigations were carried out on materials after long-term service under creep conditions. The microstructure was observed using light and scanning electron microscope. The investigations on the development of precipitation processes were done by X-ray diffraction phase analysis. Findings: Carbide precipitation evolution in correlation to the life exhaustion extent was presented. Practical implications: The presented methods can be used for evaluation of materials working under creep conditions. Originality/value: The presented results on changes in the structure and precipitation processes are applied to evaluation of the condition of elements in further industrial service.