Alloys or metallic compositions – Ferrous – Over 0.1 percent aluminum containing – but less than 4 percent
Patent
1992-04-02
1994-07-19
Yee, Deborah
Alloys or metallic compositions
Ferrous
Over 0.1 percent aluminum containing, but less than 4 percent
420 77, 420 78, 420117, C22C 3806, C22C 3802
Patent
active
053307062
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a vibration-damping alloy of high strength which has a high power of damping vibration, and which can be used to make components of structures, machines, etc. and reduce effectively the vibration thereof and the noise thereby produced.
BACKGROUND ART
The vibration and noise which occur in our living environment have been pointed out as one of the causes of public nuisance. An increase in the accuracy required of a precision machine has given rise to the necessity for providing means for preventing the vibration of the machine itself. One of the approaches which have hitherto been made to cope with those problems and requirements is to use a material having an outstandingly high power of damping vibration (a vibration-damping material) for making any component that is a source of vibration.
There have been developed a number of alloys which are macroscopically uniform and have a high power of damping vibration. The main examples thereof are flake graphite cast iron, some iron-based alloys, a Mg-Ni alloy, Cu-Mn alloys and a Ni-Ti alloy. The iron-based alloy can be said from the standpoints of strength and cost to be practically the best material for any parts that are used in a large quantity.
The known iron-based alloys include an Fe-Al alloy as proposed in Japanese Patent Publication No. 803/1977. This alloy is claimed to have a high power of damping vibration if it contains 2 to 8% Al. Japanese Patent Publication No. 28982/1981 proposes an iron-based alloy containing 0.4 to 4% Si and 0.1 to 1.5% Mn, and having a ferrite grain size number of 5 or below, and states that the Si and Mn which it contains fix N to eliminate any hindrance to the motion of dislocations which absorb vibration energy.
The vibration-damping properties of the known alloys as hereinabove described are, however, not necessarily satisfactory for the recent requirements which call for a very high level of vibration damping.
Under these circumstances, I, the inventor of this invention, have found that an alloy made by adding a specific proportion of Al or Si, or particularly both, to Fe exhibits an outstandingly high power of damping vibration which has hitherto not been possible.
DISCLOSURE OF THE INVENTION
The vibration-damping alloy of this invention which is based on the above discovery has the composition which will hereunder be set forth:
(1) A vibration-damping alloy of high strength containing those proportions of Al and Si which fall within the range defined in FIG. 1 by the lines connecting points A.sub.4 (Al: 7.05 wt. %; Si: 0.95 wt. %), B.sub.4 (Al: 6.5 wt. %; Si: 1.10 wt. %), C.sub.4 (Al: 4.70 wt. %; Si: 2.75 wt. %), D.sub.4 (Al: 2.25 wt. %; Si: 2.45 wt. %), E.sub.4 (Al: 1.00 wt. %; Si: 3.60 wt. %), F.sub.4 (Al: 1.00 wt. %; Si: more than 0.50 wt. %) and G.sub.4 (Al: 7.50 wt. %; Si: more than 0.50 wt. %), said proportion of Si being more than 0.50 wt. %, and that proportion of Mn which ranges from at least 0.1 wt. % to the sum of said proportions of Al and Si, the balance of its composition being Fe and unavoidable impurities;
(2) A vibration-damping alloy of high strength containing those proportions of Al and Si which fall within the range defined in FIG. 2 by the lines connecting points A.sub.6 (Al: 7.45 wt. %; Si: 0.55 wt. %), B.sub.6 (Al: 3.30 wt. %; Si: 1.50 wt. %), C.sub.6 (Al: 1.00 wt. %; Si: 2.75 wt. %), D.sub.6 (Al: 1.00 wt. %; Si: more than 0.50 wt. %) and E.sub.6 (Al: 7.50 wt. %; Si: more than 0.50 wt. %), said proportion of Si being more than 0.50 wt. %, and that proportion of Mn which ranges from at least 0.1 wt. % to the sum of said proportions of Al and Si, the balance of its composition being Fe and unavoidable impurities;
(3) A vibration-damping alloy of high strength containing those proportions of Al and Si which fall within the range defined in FIG. 3 by the lines connecting points A.sub.8 (Al: 5.35 wt. %; Si: more than 0.50 wt. %), B.sub.8 (Al: 5.35 wt. %; Si: 0.80 wt. %), C.sub.8 (Al: 3.30 wt. %; Si: 1.00 wt. %), D.sub.8 (Al: 2.30 wt. %; Si: 1.40 wt. %), E
Ohdake Takayuki
Ohmori Toshimichi
Sampei Tetsuya
Takamura Toshihiro
Yamada Takemi
NKK Corporation
Yee Deborah
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