The Influence of Both Functioning Time and the Service Temperature on the Mechanic Characteristics and Metallographic Structure of Some Steels
Journal Title: Analele Universitatii "Dunarea de Jos" din Galati. Fascicula IX, Metalurgie si Stiinta Materialelor - Year 2011, Vol 34, Issue 2
Abstract
The paper determines the influence of both functioning time and the service temperature on mechanic characteristics of 12H1MF steel. In this purpose, the results of mechanical tests, performed at temperatures ranging from 510 to 590 0C, have been correlated with those of the optical microscopy analysis. Due to the prolonged exposure to high temperatures, a slight degradation of the mechanical behaviour has been noticed that has been ascribed to the structural changes produced during functioning. The microstructural study of the steel has emphasized that after prolonged functioning several irreversible changes have occurred such as the increase of the ferrite grains, the dispersion of pearlite areas as well as the precipitation and coalescence of carbides. Yet, since neither decarburation nor network formation tendencies for the precipitated carbides have been observed, it has been concluded the 12H1MF steel can be kept in service even after more than 71000 functioning hours in live steam, at temperatures of 570 0C and pressures of 155 atmospheres.
Authors and Affiliations
D. MIHAI, S. MACUTA
Keywords
Related Articles
- EP ID EP627867
- DOI -
- Views 63
- Downloads 0
Modelling of the Flow and Deformation Fields at the Profiles Rolling by Field Lines Method
This paper presents a method for modeling of the rolling process based at the deformable continuous medium mechanics, the theory of field lines. The rolling of the profiles and plates may be evaluated as the plane strain...
Researches Regarding Structural Changes due to nickel Microlalloying of Hot Galvanizing Baths
This work offers a synthesis of researches performed in laboratory and regards the nickel microalloying of hot galvanizing baths. Experiments followed the structural changes of both hot galvanizing bath and deposed layer...
Improved Hardness and Tribocorrosion Properties of Nickel Coatings by Co-Depositing ZrO2 MicroSized Dispersed Phase During Electroplating Process
The tribocorrosion properties of ZrO2 – nickel microstrucured composite coatings have been studied in the following conditions: - Solution: 0.5M K2SO4; - Tribo corrosimeter: pin on disc connected with electrochemical c...
Morphological Aspects and Corrosion Behaviour of Phenol Formaldehyde/Zn Composite Coatings
The present work has the purpose of studying morphological aspects and corrosion behaviour of pure zinc and composite coatings having zinc as metal matrix and phenol – formaldehyde resin type Novolac (RESITAL 6358/1) as...
Strength Analysis of a Composite Joint Used in Ship Structure
Low weight and high strength panels are always taken into account when designing materials for sandwich panel technology, which offers an efficient solution for different problems. Different types of sandwich panels are...