Influence of cooling rate on the structure and mechanical properties of G17CrMoV5 – 10 cast steel
Journal Title: Archiwum Odlewnictwa - Year 2009, Vol 9, Issue 3
Abstract
The paper presents results of research on the influence of cooling rate on the structure and properties of G17CrMoV5 – 10 (L17HMF) cast steel. The material for research was a section taken out from an outer cylinder of a steam turbine body after about 250 000 hours of operation at the temperature of 535°C and pressure 9 MPa. The investigated cast steel was subjected to heat treatment which consisted in cooling at the rates corresponding to the processes, such as: bainitic hardening, normalizing and full annealing. Tempering after the process of cooling from austenitizing temperature was carried out at the temperatures of: 700, 720 and 740°C. Performed research has proved that structures obtained after bainitic hardening and normalizing are characterized by a large strength margin which allows to apply high temperatures of tempering. It has been shown that the cast steel of bainitic structure, with similar mechanical properties as the cast steel of bainitic – ferritic structure, is characterized by almost twice as high impact energy. Full annealing and tempering of the examined cast steel ensures only the required impact strength, with mechanical properties comparable to those after service.
Authors and Affiliations
G. Golański, J. Kupczyk
Keywords
Related Articles
- EP ID EP71994
- DOI -
- Views 108
- Downloads 0
Effect of Magnesium Oxide Nanoparticles on Water Glass Structure
An attempt has been made to determine the effect of an addition of colloidal suspensions of the nanoparticles of magnesium oxide on the structure of water glass, which is a binder for moulding and core sands. Nanoparticl...
Macrostructure of IN-713C superalloy after volume modification
The study discusses the results of the preliminary investigations of the process of volume modification of nickel and cobalt superalloys. The investigations were carried out on an IN-713C alloy. As an inoculant, cobalt a...
The solidification during flow of composite suspension in the permanent mould
The presented work presents the influence of graphite particles on the solidification kinetics of metal suspension based on AlSi10Mg alloy during the die cavity filling. In order to examine this problem, the measurements...
Evaluation of Synthetic Gypsum Recovered via Wet Flue-Gas Desulfurization from Electric Power Plants for Use in Foundries
This article investigates possible use of waste gypsum (synthetic), recovered via flue-gas desulfurization from coal-fired electric power plants, in foundries. Energy sector, which in Eastern Europe is mostly composed fr...
Effect of Water Glass Modification on Its Viscosity and Wettability of Quartz Grains
The aim of the present study was to develop a modifier for water glass. The method of thermal generation of metal oxide nanoparticles was adapted and used in the research. Nanoparticles of ZnO from the thermal decomposit...