Showing papers on "Gray iron published in 1997"
TL;DR: In this paper, a tribofilm was formed during wear tests of a Si 3 N 4 -gray iron pair lubricated with distilled water, where the reaction product may be adsorbed by graphite flakes in the iron.
20 citations
14 citations
Patent•
18 Dec 1997
TL;DR: Improved gray iron compositions include at least about 90 weight % iron, at least 340 weight % carbon, from about 1 to 25 weight % silicon and from about 0.2 to 0.7 weight % tin this paper.
Abstract: Improved gray iron compositions comprise at least about 90 weight % iron, at least about 340 weight % carbon, from about 1 to 25 weight % silicon, from about 04 to 10 weight % manganese, and from about 002 to 007 weight % tin Preferably, the gray iron compositions of the invention also include from about 02 to about 05 weight % chromium, and may further preferably include from about 025 to 075 % molybdenum and/or from about 03 to 10 % copper, and may optionally also include small amounts (less than about 1%) of such elements as titanium or vanadium, as examples The gray iron compositions may advantageously be used in the manufacture of vehicle brake components, especially the braking surfaces of vehicle brake drums (10) or brake rotors
11 citations
TL;DR: Using distilled water and air lubricants, wear tests of ceramic-cast iron pairs were carried out on a M-200 type ring-block wear tester as mentioned in this paper, and the worn surfaces of specimens were observed under scanning electron microscope (SEM) and optical microscope.
11 citations
7 citations
01 Jan 1997
TL;DR: In this article, the influence of chemical composition, nucleation and cooling conditions of eutectic gray iron on cooling curves during solidification and grain structures was investigated and a cooling and solidification model simulating cooling curves and grain structure with dependence on technological parameters was proposed.
Abstract: Experimental investigations of influence of chemical composition, nucleation and cooling conditions of eutectic gray iron on cooling curves during solidification and grain structures. Cooling and solidification model simulating cooling curves and grain structures with dependence on technological parameters. Determination of material coefficients for the crystallization model and comparison of simulated with experimental results.
3 citations
01 Feb 1997
TL;DR: In this paper, the machinability of gray and ductile iron was evaluated using micro carbides present in the irons and found that the microcarbides were the dominant component of gray irons.
Abstract: First phase was to develop a laboratory technique for evaluating the machinability of gray and ductile iron; longer term goal is to learn how to modify the foundry process to produce castings meeting all specified mechanical properties while providing improved machining behavior. Microcarbides present in the irons were found to dominate the machinability of iron. Pearlitic irons with acceptable machinability contain 8.9 to 10.5 wt% microcarbides. The weight fraction microcarbides in the iron is influenced by carbide forming element concentrations, presence of elements that retard carbon diffusion, and cooling rate from the eutectic through the eutectoid temperature range. Tool wear rate increased at higher surface machining speeds and fraction microcarbides; all irons containing above 11.5% microcarbides had poor machinability. Graphite size, shape, distribution, etc. had a lesser effect on machinability. Reducing the addition of a foundry grade Ca and Al bearing 75% FeSi inoculant from 0.5 to 0.2% increased the tool life 100%. Inoculation test castings were also poured in a class 40 gray iron; laboratory analysis is currently underway. Exploratory studies were conducted to determine if tool force could be used to predict tool life: torque and feed forces were found to correlate with machinability.
1 citations