JPH03173639A - Damping steel plate for ultrahigh temperature use and manufacture thereof - Google Patents

Abstract

PURPOSE:To improve cold press moldability and to provide especially high damping properties at high temp. by annealing the super-plastic steel powder or pieces scattered between two cold rolled steel plates containing C in a specific ratio along with the steel plates to integrate the same with the steel plates by diffusion bonding. CONSTITUTION:A super-plastic steel powder 3 is uniformly scattered over the upper surface of a cold rolled steel plate 1b with C-content of 0.2% or less. The scattered steel powder 3 is prepared by atomizing super-plastic steel and scattered to the superposed gap of two steel plates 1a, 1b in an amount of 1-95vol.%. The scattered steel powder 3 is held between both steel plates when the other steel plate 1a is superposed on the steel plate 1b at the position of a deflector roll 3b and pressed when the steel plates pass between pinch rolls 4 to be taken up by a coiler in a state bonded to both steel plates and the steel plates are cut into a coil diameter having a proper size to become a composite steel plate coil 6 before adhesion. Subsequently, the coil 6 is sent to a batchwise annealing furnace and annealed at 600-900 deg.C for a required hr in an inert atmosphere within the furnace.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an ultra-high temperature control i-steel plate that has good workability in the normal temperature range and particularly high vibration damping properties in the high temperature range, and a method for manufacturing the same.

[Conventional technology]

Conventional re-weldable composite damping steel plates in which an adhesive layer containing a conductive filler is interposed between two metal plates such as steel plates are disclosed, for example, in Japanese Patent Publication No. 60-912 and Japanese Patent Application Laid-Open No. 61-23.
There is one disclosed in Publication No. 4917.

Among these, in the former example, vinyl acetate, acrylic resin, and other thermoplastic resins, as well as urea resin, melamine resin, and other thermosetting resins are used as adhesives.
In the latter example, a similar resin is made into a liquid, a mixture of which is mixed with a conductive filler is uniformly dispersed using a spray nozzle, and after drying, two steel plates are pressed together using a 1:1 pressure. We have adopted a method of integrating them to form a weldable damping steel plate.

[Problem to be solved by the invention] However, the conventional composite vibration damping steel plate as described above has the following problems:
It is laminated and bonded with a viscoelastic resin such as thermoplastic resin or thermosetting resin interposed between steel plates, and because this type of resin is used, the loss coefficient characteristics in damping action are good. Is it extremely narrow to indicate a value? Limited to AM degree range. For example, one that is used in the range of 0 to 60°C around the 30°C side is for room temperature, one that is used at around 40 to -120°C around the 70'C side is for medium temperature, and 1
Products for high temperatures, mainly around 30°C and up to about 90 to 160'C, have been developed, but no product that can be used at higher temperatures has yet been developed. Therefore, there was a problem that it could not be used as a material for engine parts, exhaust system parts, etc.

This invention was made in view of such conventional problems, and aims to solve the problems described in - by using superplastic 14 steel powder or J-〒 as an adhesive. I am with you.

[Failure to solve the problem]

In order to achieve the above-mentioned objects, this invention
at least two cold-rolled sheets 1 containing
The superplastic steel powder or pieces sprinkled between one plate are
It is annealed together with the steel plate, diffusion bonded to the steel plate, and then assembled into an ultra-high temperature vibration damping button 1, and in order to obtain the steel plate, at least two cold-rolled buttons are assembled. After sandwiching the plate with superplastic steel↓l) or pieces between the steel plates,
To provide a method for manufacturing a vibration damping steel plate for ultra-high temperature use, which is annealed at 600'C to 900'C for a required time, diffusion bonded with superplastic steel powder or steel J1, and then integrated.
There is C.

[Function] In superplastic steel sheets and I-, "C" is mainly used with a hypercommon phase steel composition, and the C content is about 0.8 to 2.0%. Steel sheets with this composition 1μm J
J11 degree ultra-fine fly I and II! The kneading of about m of Shimentai I; 114+ coins and A, J, Su, several 100% elongation G in the temperature range of several 100 degrees Celsius IFj
I'm here.

However, since the steel sheet itself is extremely tough, it is generally cold-processed.
The properties are not very good, for example, complex parts such as automobile parts (2) cold forming of a shape does not produce 41J, but superplasticity (1)i steel exhibits superplasticity.
111 degree area (7() 0-800'c) Te vibration damping 1
It is known that there is no.

Therefore, between cold-rolled c When the cold-rolled steel plate is annealed at 600 to 900°C for the required time, the superplastic steel powder bonds the two steel plates together by diffusion bonding. become In this case, the reason why we used a steel plate with C10.2% is because unless the C10.2% steel plate is used, the workability of the steel plate is poor and the desired mechanical properties cannot be obtained, so forming such as drawing is not possible. This is because it becomes difficult. Regarding the annealing temperature, if the annealing temperature is lower than 600°C, the so-called green plate that is cold rolled will be difficult to recrystallize, and the time required for diffusion bonding will be too long for industrial purposes. If the temperature exceeds 900°C, transformation occurs and a preferable recrystallized texture cannot be obtained.

For this reason, the annealing temperature is set to 600°C to 900°C.

The composite steel sheet formed in this manner has good workability at room temperature, and since it has a superplastic steel layer, it has good controllability when used in high-temperature areas, such as engine parts. It will exhibit vibrancy.

〔Example〕

Hereinafter, the present invention will be explained with reference to drawings and graphs.

FIG. 1 is a conceptual diagram of a production line for a distributed steel plate according to the present invention.

In the figure, la and lb are cold-rolled steel plates (hereinafter referred to as copper strips) sent from supinated uncoilers. Plastic steel powder 3 is uniformly spread. This sprinkled steel powder is made by atomizing superplastic steel into powder, and in the example, a powder of 1 to 95 ν01% is sprinkled to the gap between two overlapping steel strips 1a and 1b. .

When the other steel strip 1a overlaps the steel strip 1b at the position of the deflation crawl 31), the scattered steel powder 3 is sandwiched between both steel strips, and is pressed when passing through the pinch II J-ru 4. A composite steel sheet is wound onto both steel strips by a coiler 5, cut into a coil diameter of an appropriate size, and then assembled into a single sheet of composite steel before being bonded.
It becomes Ile 6. Next, the 21-iron 6 is sent to a saw-type annealing furnace 7 as shown by the arrow, and is annealed in an inert atmosphere at a temperature of 600 to 900 DEG C. for a required period of time.

The heating time is i; The two steel strips 1a and lb are bonded and integrated by diffusion bonding action to form an ultra-high temperature vibration damping steel plate.Next, this vibration damping steel plate 6 is temper-rolled by a skin pass rolling mill 8 to ensure zero warpage, etc. After modification, the ultra-high temperature vibration damping steel plate 6a is obtained as a completed product.

Next, further examples according to the present invention and their results will be shown.

In this example, two cold rolled steel plates are used with a thickness of 0.
8 mm, tJI formation is C10,0:3. Si
/'Fr1Mn10.24. Plo, 02. S
10.17. Afflo.

An unannealed plate (a) and an annealed plate (b) of 04 (composition ■) were used. The supercomposition steel powder sandwiched between the cold-rolled steel plates described in - has an NU composition of C/1.0,5i10, I
O, Mn/1.2. Plo, 02. S10.
A material of 02Δff10.03 (composition ■) was atomized to produce steel powder with a grain size of 90 μm, and was distributed in an amount of about 50ν01% of the space volume between 1 sheets of cold-rolled steel as described above. Accordingly, the above unannealed plate (A) and annealed plate (+:+
) was used to produce damping steel plate B (annealed at 700°C for 10 hours in an Ar atmosphere). FIG. 2 is a graph showing the relationship between the loss coefficient and temperature of these steel plates,
A in the graph indicates a superplastic steel plate (one sheet) having the above composition (1), and it is understood that this steel plate has vibration damping properties in the temperature range of 700 to 800°C. However, this superplastic steel sheet Δ generally does not have good cold workability, and cannot be cold press-formed into parts with complex shapes such as automobile parts.

On the other hand, composite vibration damping steel sheets manufactured by sandwiching copper powder with the composition ■ between steel plates with the composition ■ are manufactured as unannealed sheets (
Regardless of whether a) or annealed plate (b) is used, it has good cold workability and is particularly suitable for use in high-temperature ranges as a material for parts used under conditions of heating up to a maximum temperature of about 800"C. It can be seen that this is suitable when large loss characteristics are required.

In other words, the maximum applicable temperature of conventional high-temperature damping steel plates is 150
It is possible to obtain an ultra-high temperature vibration damping steel plate that can be used in a high temperature range from 2°C or higher to about 800°C.

[Effects of the Invention] As explained above, according to the present invention, (1) it has good press formability in the cold and particularly high vibration damping properties at high temperatures, so it can be used as a material for parts around the engine, etc. “
An ultra-high temperature vibration damping steel plate can be obtained that can be applied to products heated up to about C. (2) The steel plate used is not an annealed plate, but may be a cold-rolled unrecrystallized plate. That is,
This is because recrystallization can be performed simultaneously with diffusion bonding, so there is no need to perform annealing in advance to obtain workability, and costs can be reduced accordingly.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of a manufacturing line for a damping steel plate for ultra-high temperatures according to the present invention, and FIG. 2 is a graph showing the relationship between temperature and loss coefficient of the damping steel plate. la, Ib... steel plate, 3... superplastic steel powder. 6

Claims (2)

[Claims] (1) Superplastic steel powder or pieces spread between at least two cold-rolled steel plates containing C≦0.2% are annealed together with the steel plates and diffusion bonded with the steel plates. An integrated ultra-high temperature vibration damping steel plate. (2) At least two cold-rolled steel plates containing C≦0.2% are sandwiched between the steel plates by sprinkling superplastic steel powder or pieces, and then heated at 600°C to 900°C for the required time. A method for manufacturing a vibration damping steel plate for ultra-high temperature use, characterized by annealing and integrating by diffusion bonding with superplastic steel powder or pieces.