The objective of the research was to determine the influence of boron on the crystallization process and microstructure of ductile cast iron.
In the case of ductile cast iron it is a vital issue because even as little as trace presence of boron changes the properties of ductile cast iron
in a significant way. With the use of a new ATD-4 (TDA) tester and CRYSTALDIGRPAH converter it was possible to measure the
crystallization process parameters of the same alloy with four different contents of boron in one mould. Four samples with different boron
contents were extracted, their microhardness was measured and quantitative analysis of microstructure was conducted. Obtained results
allowed to state that with increasing content of boron the amount of graphite precipitates decreases, the amount of pearlite precipitates
increases, the shape of graphite precipitates deteriorates and hardness increases. It is also planned to perform additional testings with boron
contents between previously tested values.
Results of investigations of wear resistant of two species of cast steel were introduced in the article (low-alloyed and chromium cast steel) on the background of the standard material which was low alloy wear resistant steel about the trade name CREUSABRO ®8000. The investigations were executed with two methods: abrasive wears in the stream of loose particles (the stream of quartz sand) and abrasive wears particles fixed (abrasive paper with the silicon carbide). Comparing the results of investigations in the experiments was based about the counted wear index which characterizes the wears of the studied material in the relation to the standard material.
In the paper the results and analysis of corrosion tests were presented for low-alloyed cast steel in as-cast state and after heat treatment
operations. Such alloys are applied for heavy loaded parts manufacturing, especially for mining industry. The corrosion test were
performed in conditions of high salinity, similar to those occurring during the coal mining. The results have shown, that small changes in
chemical composition and the heat treatment influence significantly the corrosion behaviour of studied low-alloyed cast steels.
The aim of presented studies was to develop a new geometry of the overflow part of standard ATD–C tester for derivative thermal analysis
in a way that it would allow to obtain samples for abrasion and mechanical properties tests in the same mould without the need of cutting
them from a block of material. The pattern of new ATD–P tester has parts reflecting implemented samples. Computer simulations
regarding initial verification of new tester were performed in NovaFlow software. Chromium cast iron melts were made for testing the
sampler in real conditions and TDA analysis for casting material were conducted. The sandmix was prepared on silica sand matrix per the
ALPHASET technology. This new solution greatly simplifies the preparations of materials difficult to machine.
The results of research on stereological parameters of carbides in modified hypoeutectic chromium cast iron were shown in the paper. The
effect of distance the casting heat centre of casting to the carbide phase morphology was examined. The samples for metallographic
examination were taken from various locations of the model casting prepared in a special tester. This model casting was designed to
simulate the solidification of heavy castings. Using the proposed methodology the relation of the distance from the model mould and the
size, perimeter, length, width and the shape factor of carbides was examined. During the analysis, the values of stereological parameters of
carbides changed on various sections of the model casting.
Paper presents the results of studies on primary crystallization and wear resistance of high chromium cast iron inoculated with
ferrotitanium intended for work in abrasive conditions. Primary crystallization was examined with use of TDA method, wear tests of the
samples were conducted using the modified pin-on-disk method.
In this paper crystallization studies of low-alloyed construction cast steel were presented for different additions of chromium, nickel and
molybdenum modified with vanadium and titanium. Studies were conducted using developed TDA stand, which additionally enabled
evaluation of cooling rate influence on crystallization process of investigated alloys.
The article shows results of studies of primary crystallization and wear resistance of Cr-Ni-Mo cast steel intended for work in corrosive
and abrasive conditions. The studies of primary crystallization were conducted with use of TDA method and modified tester allowing
measurement casting cooling time influence on the cooling and crystallization curves of studied alloys. After heat treatment of examined
cast steel wear tests of the samples were conducted on pin-on-disc type device.
In the paper the results and analysis of abrasive wear studies were shown for two grades of cast steels: low-alloyed cast steel applied for
heavy machinery parts such as housing, covers etc. and chromium cast steels applied for kinetic nodes of pin-sleeve type. Studies were
performed using the modified in Department of Foundry pin-on-disc method.