EP0649914B1 - An Fe-Mn vibration damping alloy steel and a method for making the same - Google Patents
An Fe-Mn vibration damping alloy steel and a method for making the same Download PDFInfo
- Publication number
- EP0649914B1 EP0649914B1 EP94401992A EP94401992A EP0649914B1 EP 0649914 B1 EP0649914 B1 EP 0649914B1 EP 94401992 A EP94401992 A EP 94401992A EP 94401992 A EP94401992 A EP 94401992A EP 0649914 B1 EP0649914 B1 EP 0649914B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- alloy
- alloy steel
- vibration damping
- ingot
- cold rolling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Definitions
- the present invention relates to a method for making an Fe-Mn vibration damping alloy steel at a low production cost.
- vibration damping alloy In line with a trend for high-grade and high precision aircraft, ships, automotive vehicles and various machinery, vibration damping alloy is widely used in the many kinds of machine parts that are sources of vibration and noise. Study of vibration damping alloys has been lively because of the increase in demand for such alloys.
- Vibration damping alloys developed and used so far are classified into following types: Fe-C-Si and Al-Zn which are of the composite type; Fe-Cr, Fe-Cr-Al and Co-Ni which are of the ferromagnetic type; Mg-Zr, Mg and Mg 2 Ni which are of the dislocation type;- and Mn-Cu, Cu-Al-Ni and Ni-Ti which are of the twin type.
- the above vibration damping alloys have excellent vibration damping capacities but have poor mechanical properties. Thus, the alloys cannot be used widely; and since they contain a lot of expensive elements, the production costs are high, limiting the industrial use of the alloys.
- an amount of electrolytic iron and an electrolytic manganese is weighed to contain 10 to 24% manganese by weight and the remainder iron.
- the iron is melted first by heating in a melting furnace at more than 1500°C; and then the manganese is charged and melted.
- the melted mixture is cast into a mold to produce an ingot.
- the cast ingot is homogenized at 1000°C to 1300°C for 12 to 40 hours and then the homogenized ingot is hot-rolled to produce a rolled metal of a predetermined dimension.
- the rolled metal is subjected to a solid solution treatment at 900°C to 1100°C for 30 to 60 minutes and cooled by air or water. Finally the rolled metal is again cold rolled around room temperature (25°C ⁇ 50°C) so as to have a reduction rate of 5-25%, thereby obtaining Fe-Mn alloy steels having high vibration damping capacities.
- the reason why the above condition is determined in the present invention is as follows.
- the homogenizing condition is defined to be at 1000°C to 1300°C for 12 to 40 hours so that the manganese, the main element, may be segregated during the period of time the ingot is cast.
- the ingot is heated at a high temperature of 1000°C to 1300°C, the high concentrated manganese is diffused into a low concentration region which homogenizes the composition of the manganese.
- the homogenization time may be reduced to be within 12 hours, but a local melting phenomenon may occur at the grain boundary where the manganese is segregated during casting. Accordingly, the homogenization is preferably performed at 1000°C to 1300°C for 12 to 40 hours.
- the solid solution treatment is performed at 900°C to 1100°C for 30 to 60 minutes. If the treatment is carried out at higher than 1100°C, the grains of the alloys are coarsened which deteriorates the tensile strength. If the temperature is too low, such as less than 900°C, the grains become so small that raising the tensile strength decreases the martensite start temperature(Ms). Thus, a small amount of epsilon martensite is produced and the damping capacity is lowered. Accordingly, the optimum condition to have both excellent tensile strength and damping capacity is at 900°C to 1100°C for 30 to 60 minutes.
- the alloy of the present invention contains manganese of 10 to 24% by weight, see, FIG. 1 of the binary phase diagram.
- the alloys which contain up to 10% manganese create ⁇ ' martensite, the alloys which contain from 10 to 15% manganese create a 3-phase mixture structure of ⁇ + ⁇ ' + ⁇ , and the alloys which contain from 15 to 28% manganese create a 2-phase mixture structure of ⁇ + ⁇ .
- the Fe-Mn vibration damping mechanism absorbs vibration energy by movement of the ⁇ / ⁇ interface under external vibration stress. If the manganese alloy is less than 10% Mn only one phase, ⁇ ' martensite is created and the vibration damping effect hardly occurs. Since ⁇ and ⁇ martensites are extensive in the 10 to 28% Mn alloys, a lot of ⁇ / ⁇ interfaces exist which yields high vibration damping effects.
- the damping capacity cannot be improved by cold rolling when the alloy has more than 24% Mn by weight. Accordingly, the composition of Mn is defined to the range of 10 to 24% because ⁇ martensite is produced preferentially by cold rolling at around room temperature without slip dislocation.
- the cold rolling is performed at a reduction of less than 30% at around the room temperature, more fine and thin ⁇ plates are produced inside by the cold rolling which increases the total interface area of the ⁇ / ⁇ interface, and higher vibration damping capacity is obtained than before the cold rolling. If the amount of cold rolling is increased to more than 30%, coalescence of ⁇ martensite plates occurs, and hence the ⁇ / ⁇ interface area is reduced. The martensite produced in this way restrains the movement of the ⁇ / ⁇ interface, and a lot of dislocations are produced inside the ⁇ and ⁇ martensites which interact with the ⁇ / ⁇ interface disturbing the movement of the ⁇ / ⁇ interface and thereby degrading the vibration damping capacity.
- the alloy of the present invention may contain carbon of up to 0.2% by weight, silicon of up to 0.4% by weight, sulfur of up to 0.05% by weight, and phosphorus of up to 0.05% by weight as impurities.
- the impurity elements are diffused to the ⁇ / ⁇ interfaces which locks the interface, and movement of the ⁇ / ⁇ interfaces is difficult, thereby degrading the vibration damping capacities.
- Table 1 shows the comparison of results of the vibration damping capacities in the alloy of the present invention and the conventional alloy according to the cold rolling process.
- the alloy of the present invention that has undergone cold rolling has a superior vibration damping effect compared to the alloy that is not cold rolled.
- SDC Alloy Specific Damping Capacity
- Fe-10% Mn 10 10 14 14 9 Alloy steel with composition according to the present invention Fe-13% Mn 12 12 16 16 11 Fe-15% Mn 15 15 20 20 14 Fe-17% Mn 25 25 30 30 23 Fe-20% Mn 25 25 30 30 23 Fe-23% Mn 22 22 27 27 21 Fe-24% Mn 15 15 20 20 14 Fe-26% Mn 9 9 10 10 9
- FIG. 1 shows the Fe-rich side of Fe-Mn binary phase diagram which is the basis of this invention. Transformation temperatures of each phase are determined using a dilatometer by cooling at a rate of 3°C/min.
- ⁇ ' martensite is formed in the case of up to 10% Mn by weight.
- ⁇ + ⁇ ' + ⁇ is formed in the case of 10 to 15% Mn by weight.
- ⁇ + ⁇ is formed in the case of 15 to 28% Mn by weight and a single phase structure of ⁇ in the case of more than 28% Mn by weight.
- FIG. 2 shows a volume fraction of each phase by an X-ray diffraction analysis method after each alloy is subjected to solid solution treatment at 1000°C and air-cooled to the room temperature.
- the Mn percentages by weight corresponding to ⁇ ' martensitic alloy have a poor vibration damping capacity and the alloy of ⁇ + ⁇ ' + ⁇ mixture structure has excellent vibration damping capacity as well as tensile strength.
- Table 2 shows a comparison of vibration damping capacities according to martensitic structure in case of 10% reduction by cold rolling.
- SDC Alloy Structure Specific Damping Capacity
- Kg/mm2 Tensile Strength (Kg/mm2) Fe - 4% Mn ⁇ ' martensite 5 66 Fe - 17% Mn ⁇ + ⁇ '+ ⁇ martensite 30 70 Low Carbon Steel Tempered martensite 5 49
- the alloy having the ⁇ + ⁇ ' + ⁇ mixture structure has a greater vibration damping capacity than that of ⁇ ' martensitic alloy, because the sub-structure of the ⁇ ' martensite consists of dislocations and absorbs vibration energy by movement of the dislocations.
- the alloy of the ⁇ + ⁇ ' + ⁇ mixture structure if the alloy receives vibrational stress, the ⁇ / ⁇ interface moves and absorbs vibration energy yielding an excellent vibration damping capacity.
- FIG. 3 shows the variation of a specific damping capacities according to the amount of cold rolling in case of the Fe-17% Mn alloy.
- the specific damping capacity (SDC) is increased in accordance with the increase in the amount of cold rolling, and maximum vibration damping capacity is presented at the reduction rate from 10 to 20%. If the amount of cold rolling is more than about 20%, the SDC is decreased. If the amount of cold rolling is more than about 30%, the vibration damping capacity is less than the vibration damping capacity without cold rolling.
- the method according to the present invention stipulates 5-25% cold rolling reduction rate.
- the comparative alloy Fe-4%Mn
- Fe-17%Mn alloy has a remarkable vibrational amplitude decay after water quenching for high temperature rolling (FIG. 4C).
- FIG. 4D shows free vibration damping curves of a comparative alloy and the alloy of this invention before and after the cold rolling.
- the alloys of this invention have vibration damping capacities and mechanical properties which are superior to conventional alloys.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
Description
Name of Alloy | Specific Damping Capacity (SDC) | Note | ||||||
Air-Cooled | Water- | 10% Cold-Rolled | 20% Cold-Rolled | 35% Cold-Rolled | ||||
Fe-8% | Mn | 6 | 6 | 6 | 6 | 5 | Comparative Alloy steel | |
Fe-10 | Mn | 10 | 10 | 14 | 14 | 9 | Alloy steel with composition according to the present invention | |
Fe-13% | Mn | 12 | 12 | 16 | 16 | 11 | ||
Fe-15 | Mn | 15 | 15 | 20 | 20 | 14 | ||
Fe-17 | Mn | 25 | 25 | 30 | 30 | 23 | ||
Fe-20 | Mn | 25 | 25 | 30 | 30 | 23 | ||
Fe-23% | Mn | 22 | 22 | 27 | 27 | 21 | ||
Fe-24 | Mn | 15 | 15 | 20 | 20 | 14 | ||
Fe-26% | Mn | 9 | 9 | 10 | 10 | 9 | Comparative Alloy steel | |
Fe-4 | Mn | 5 | 5 | 5 | 5 | 5 | Comparative Alloy | |
Carbon Steel | ||||||||
5 | 5 | 5 | 5 | 5 | Conventional Steel |
Name of Alloy | Structure | Specific Damping Capacity (SDC) | Tensile Strength (Kg/mm2) |
Fe - 4% Mn | α' | 5 | 66 |
Fe - 17% Mn | ε+α'+γ martensite | 30 | 70 |
Low Carbon Steel | Tempered | 5 | 49 |
Claims (1)
- A method for making an Fe-Mn vibration damping alloy steel, comprising the steps of:melting an alloy consisting of 10 to 24 % manganese by weight, remaining iron and unavoidable impurities to produce a melted alloy ;casting the melted alloy into a mold to produce a metal ingot ;heating the ingot at a temperature of 1000°C to 1300°C for 12 to 40 hours to homogenize the ingot, and hot-rolling the homogenized ingot to produce a rolled alloy steel;performing a solid solution treatment on the alloy steel at 900 to 1100°C for 30 to 60 minutes ; andcooling the alloy steel by air or water to room temperature ;
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR9321973 | 1993-10-22 | ||
KR1019930021973A KR960006453B1 (en) | 1993-10-22 | 1993-10-22 | Making method of vibration decrease alloy steel & the manufacturing process |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0649914A2 EP0649914A2 (en) | 1995-04-26 |
EP0649914A3 EP0649914A3 (en) | 1995-10-25 |
EP0649914B1 true EP0649914B1 (en) | 1998-03-04 |
Family
ID=19366339
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94401992A Expired - Lifetime EP0649914B1 (en) | 1993-10-22 | 1994-09-07 | An Fe-Mn vibration damping alloy steel and a method for making the same |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0649914B1 (en) |
JP (1) | JP2637371B2 (en) |
KR (1) | KR960006453B1 (en) |
AT (1) | ATE163687T1 (en) |
DE (1) | DE69408773T2 (en) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20000033105A (en) * | 1998-11-19 | 2000-06-15 | 구자홍 | Lug assembly for color cathode ray tube and method thereof |
US6979182B2 (en) | 2001-07-31 | 2005-12-27 | Kabushiki Kaisha Toyota Jidoshokki | Vibration damping mechanism for piston type compressor |
JP4631228B2 (en) | 2001-07-31 | 2011-02-16 | 株式会社豊田自動織機 | Vibration isolation structure in piston type compressor |
WO2006109919A1 (en) * | 2005-04-11 | 2006-10-19 | Korea Institute Of Science And Technology | High-strength damping alloys and low-noise diamond saw using the same |
DE102006059884B4 (en) * | 2006-12-19 | 2020-08-06 | Volkswagen Ag | Austenitic welding filler material based on iron for welding an austenitic material with another material |
KR100840287B1 (en) * | 2006-12-26 | 2008-06-20 | 주식회사 포스코 | Composite steel of retained austenite and hcp martensite, and method for heat treatment thereof |
JP5200243B2 (en) * | 2007-02-14 | 2013-06-05 | 国立大学法人 名古屋工業大学 | Method for improving damping characteristics of Fe-Mn alloy |
JP4984272B2 (en) * | 2009-08-26 | 2012-07-25 | 有限会社Tkテクノコンサルティング | Steel with excellent vibration damping performance, method for producing the same, and damping body including the steel |
RU2443795C2 (en) * | 2010-04-16 | 2012-02-27 | Тамара Федоровна Волынова | MULTI-FUNCTION ANTIFRICTION NANOSTRUCTURE WEAR-RESISTANT DAMPING ALLOYS WITH SHAPE MEMORY EFFECT ON METASTABLE BASIS OF IRON WITH STRUCTURE OF HEXAGONAL ε-MARTENSITE, AND ITEMS USING THESE ALLOYS WITH EFFECT OF SELF-ORGANISATION OF NANOSTRUCTURE COMPOSITIONS, SELF-STRENGTHENING AND SELF-LUBRICATION OF FRICTION SURFACES, WITH EFFECT OF SELF-DAMPING OF VIBRATIONS AND NOISES |
JP2013221191A (en) * | 2012-04-18 | 2013-10-28 | Nagoya Institute Of Technology | Method for treating damping alloy |
WO2014175588A1 (en) * | 2013-04-25 | 2014-10-30 | 주식회사 우진 | Ultrasonic flow rate measurement system |
KR101518599B1 (en) | 2013-10-23 | 2015-05-07 | 주식회사 포스코 | High manganess steel sheet with high strength and excellent vibration isolation property and mathod for manufacturing the same |
KR101543898B1 (en) * | 2013-12-24 | 2015-08-11 | 주식회사 포스코 | Steel having excellent impact toughness of welding zone and welding property |
KR101736636B1 (en) * | 2015-12-23 | 2017-05-17 | 주식회사 포스코 | HIHG-Mn STEEL PLATE HAVING EXCELLENT DAMPING PROPERTY AND METHOD FOR PRODUCING THE SAME |
CN114807726A (en) * | 2022-05-06 | 2022-07-29 | 成都大学 | Method for rapidly preparing Fe-Mn damping alloy |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2434330A1 (en) * | 1974-07-17 | 1976-01-29 | Stephan & Soehne | DOUGH MIXING AND MIXING MACHINE |
JPS62142722A (en) * | 1985-12-18 | 1987-06-26 | Nippon Steel Corp | Manufacture of high tension steel superior in weldability |
ATE114736T1 (en) * | 1988-07-08 | 1994-12-15 | Famcy Steel Corp | APPLICATION OF A DIPHASE IRON-MANGANE-ALUMINIUM-CARBON ALLOY WITH HIGH DAMPING CAPACITY. |
JPH05255813A (en) * | 1991-12-24 | 1993-10-05 | Nippon Steel Corp | High strength alloy excellent in workability and damping capacity |
-
1993
- 1993-10-22 KR KR1019930021973A patent/KR960006453B1/en not_active IP Right Cessation
-
1994
- 1994-08-10 JP JP6188322A patent/JP2637371B2/en not_active Expired - Fee Related
- 1994-09-07 AT AT94401992T patent/ATE163687T1/en active
- 1994-09-07 EP EP94401992A patent/EP0649914B1/en not_active Expired - Lifetime
- 1994-09-07 DE DE69408773T patent/DE69408773T2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ATE163687T1 (en) | 1998-03-15 |
JPH07150300A (en) | 1995-06-13 |
DE69408773D1 (en) | 1998-04-09 |
DE69408773T2 (en) | 1998-08-13 |
KR950011633A (en) | 1995-05-15 |
JP2637371B2 (en) | 1997-08-06 |
KR960006453B1 (en) | 1996-05-16 |
EP0649914A2 (en) | 1995-04-26 |
EP0649914A3 (en) | 1995-10-25 |
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