JP4754372B2 - Manufacturing method of dissimilar material joined body - Google Patents

Description

  The present invention relates to a method for manufacturing a dissimilar metal material joined body capable of joining plate members made of different metal materials while controlling the amount of warpage.

  High mechanical wear materials such as cemented carbide and ceramic are used for mechanical parts that require wear resistance, such as tappets. In addition, for a member that requires particularly excellent wear resistance at only a part thereof, such as a die (die) used for extrusion molding, etc., for example, joining by laminating and joining two plate members of different materials A body is used (for example, see Patent Documents 1 and 2).

  Patent Document 1 discloses an aluminum metal joined body obtained by joining aluminum or an aluminum metal member made of a metal containing aluminum as a main component and a dissimilar member made of a material different from the aluminum metal member. An aluminum metal joined body having a soft metal layer having a Hv hardness of 20 to 80 (micro Vickers; load of 100 gf) and a thickness of 0.1 to 3 mm is disclosed.

  In Patent Document 2, in a metal-ceramic bonded body having a structure in which a metal body and a ceramic body are bonded via a brazing material layer, the metal body is cooled from an austenite state at a predetermined cooling rate. When steel materials having the property of being hardened by heat are used, and when the steel materials and brazing materials are cooled at a predetermined cooling rate, the solidus temperature of the brazing material layer and the predetermined transformation start temperature of the steel materials have a specific relationship Disclosed are metal-ceramic joints each selected to satisfy the above requirements.

  When manufacturing such a dissimilar metal material joined body, for example, after laminating two plate members made of different metal materials, the laminated plate members are heated in a state of being sandwiched and pressed by, for example, a pressing die. Thus, a method of joining two laminated plate-like members is used.

However, the dissimilar metal material joined body obtained by such a manufacturing method has a problem that it is likely to be deformed due to a difference in thermal expansion coefficient of each metal material. In particular, a plate-like joined body obtained by laminating and joining plate-like members is likely to warp on the side of one plate-like member. In addition, it is extremely difficult to accurately control the amount of warpage generated, and it is effective to manufacture a dissimilar material joined body having a desired shape by joining plate members made of different metal materials while controlling the amount of warpage. No current method has been found so far.
JP-A-10-5992 JP 2002-179473 A

  The present invention has been made in view of such problems of the prior art, and the object of the present invention is to easily and arbitrarily control the amount of warpage between plate members made of different metal materials. It is an object of the present invention to provide a method of joining and manufacturing a joined body of different materials having a desired shape.

As a result of intensive studies to achieve the above-mentioned problems, the present inventors have (1) bonding temperature, ( 2 ) temperature at which the press pressure applied at the time of bonding is released (press opening temperature), and (3) press pressure at the time of bonding. And the present invention has been completed by finding that the above-mentioned problems can be achieved by utilizing a correlation between the amount of warpage and the amount of warpage generated in the obtained dissimilar metal material joined body.

  That is, according to the present invention, the following method for producing a joined body of different materials is provided.

  [1] a first plate member made of a first metal material capable of causing at least one phase transformation selected from the group consisting of martensitic transformation, bainite transformation, and pearlite transformation by cooling of the austenite phase; and While preparing the 2nd plate-shaped member which consists of a 2nd metal material in which a temperature-heat shrinkage rate curve may cross | intersect the temperature-heat shrinkage rate curve of said 1st metal material, following (1)-(3 And a dissimilar metal material joined body for obtaining a dissimilar metal material joined body in which the first plate member and the second plate member are laminated and joined.

(1): A plurality of test piece laminates obtained by laminating a first test piece made of the first metal material and a second test piece made of the second metal material, the first metal material being While joining a plurality of test joint temperatures (Tj ₁ , Tj ₂ ˜) that are equal to or higher than the temperature at which austenite transformation occurs, a plurality of high-temperature test piece joints are obtained, and the obtained plurality of test piece joints are cooled. , warpage occurring at room temperature in each of the test pieces bonded bodies _{(C 1,} C 2 ~) is measured, the test junction temperature _(Tj 1, Tj 2 ~) and the amount of warpage _{(C 1,} C 2 ~ ) To predict the amount of warpage (C) that occurs at room temperature in the dissimilar metal material joined body corresponding to the joining temperature (Tj) and the joining temperature (Tj), and the first plate-like member And the second plate-like member, the joining temperature at which the warpage (C) occurs Join at (Tj).

(2): A plurality of test piece laminates obtained by laminating a first test piece made of the first metal material and a second test piece made of the second metal material, under a predetermined press pressure condition. The first metal material is bonded at a bonding temperature equal to or higher than the temperature at which the austenite transformation occurs, to obtain a plurality of high-temperature test piece assemblies, and the plurality of test piece assemblies thus obtained are subjected to a plurality of test press pressures. While cooling while releasing the press pressure at the open temperature (Tr ₁ , Tr ₂ ˜), the amount of warpage (C ₁ , C ₂ ˜) generated in each test piece assembly at normal temperature was measured, and the test press Based on the correlation between the pressure release temperature (Tr ₁ , Tr ₂ ˜) and the warp amount (C ₁ , C ₂ ˜), the press pressure release temperature (Tr) and the press pressure release temperature (Tr) Occurs at room temperature in the dissimilar metal material joined body After predicting the warpage amount (C) and joining the first plate-like member and the second plate-like member at or above the temperature at which the first metal material undergoes austenite transformation , the warpage amount (C) is It cools to normal temperature , releasing press pressure at the said press pressure release temperature (Tr) which arises.

(3): A plurality of test piece laminates in which a first test piece made of the first metal material and a second test piece made of the second metal material are laminated, A plurality of high-temperature test piece assemblies are obtained by bonding at a bonding temperature equal to or higher than the temperature at which austenite transformation occurs, and the obtained plurality of test piece assemblies are subjected to a plurality of test press pressures (P ₁ , P _2- ). The amount of warpage (C ₁ , C _2- ) generated at room temperature in each of the test piece assemblies was measured, and the test press pressure (P ₁ , P _2- ) and the amount of warpage were measured. Based on the correlation of (C ₁ , C _2- ), predict the press pressure (P) and the amount of warpage (C) that occurs at room temperature in the dissimilar metal material joined body corresponding to the press pressure (P), The first metal material is used for the first plate member and the second plate member. -After joining at a temperature above the temperature at which the austenite transformation occurs , it is cooled to room temperature under the conditions of the press pressure (P) at which the warpage (C) occurs.

[2] The dissimilar metal material joined body according to [1], wherein the first metal material is selected from an iron-based alloy, steel, and stainless steel .

  [3] The method for producing a dissimilar metal material joined body according to [1] or [2], wherein the second metal material is a tungsten carbide base cemented carbide.

  [4] The tungsten carbide based cemented carbide is the alloy obtained by sintering tungsten carbide with at least one metal selected from the group consisting of iron, cobalt, nickel, titanium, and chromium. Manufacturing method for different types of metal material.

  [5] The method for producing a dissimilar metal material joined body according to any one of [1] to [4], wherein a brazing material is disposed between the first plate-like member and the second plate-like member. .

  [6] The method for producing a dissimilar metal material joined body according to [5], wherein the brazing material includes at least one metal selected from the group consisting of copper, silver, gold, nickel, and aluminum.

  According to the method for producing a dissimilar metal material joined body of the present invention, plate-like members made of different metal materials are joined together while simply and arbitrarily controlling the amount of warpage, and a dissimilar metal material joined body having a desired shape is obtained. Can be manufactured.

  BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out the present invention will be described below, but the present invention is not limited to the following embodiment, and is based on the ordinary knowledge of those skilled in the art without departing from the gist of the present invention. It should be understood that modifications and improvements as appropriate to the following embodiments also fall within the scope of the present invention.

  In the method for producing a dissimilar metal material joined body of the present invention, first, a first plate member and a second plate member are prepared. The first plate member is a member made of a first metal material capable of causing at least one phase transformation selected from the group consisting of martensite transformation, bainite transformation, and pearlite transformation by cooling of the austenite phase.

Specific examples of the first metal material include those selected from iron-based alloys, steel, and stainless steel . Among these, stainless steel is preferable. More specifically, SUS630 (C; 0.07 mass% or less, Si; 1.00 mass% or less, Mn 1.00 mass% or less, P; 0.040 mass% or less, S; 0.030 mass% or less , Ni; 3.00 to 5.00% by mass, Cr; 15.50 to 17.50% by mass, Cu; 3.00 to 5.00% by mass, Nb + Ta; 0.15 to 0.45% by mass, and Fe; balance) can be cited as a preferred example. These metals and alloys are relatively easy to machine and inexpensive, and are suitable as metal materials constituting the first plate member. Further, the first metal material is carbon (C), chromium (Cr), nickel (Ni), copper (Cu), molybdenum (Mo), tungsten (W), cobalt (Co), aluminum (Al), silicon It is preferable to contain additives such as (Si), molybdenum (Mo), platinum (Pt), and palladium (Pd).

  The second plate member joined to the first plate member is made of a second metal material whose temperature-heat shrinkage curve can intersect with the temperature-heat shrinkage curve of the first metal material. It is a member. FIG. 1 is a temperature-heat shrinkage curve in which heat shrinkage ratio is plotted against temperature for SUS630 and tungsten carbide base cemented carbide. As shown in FIG. 1, a temperature-heat shrinkage curve of SUS630, which is a representative example of the first metal material, and a temperature-heat shrinkage curve of a tungsten carbide-based cemented carbide, which is a typical example of the second metal material. Although it depends on the cooling start temperature, it can cross at a predetermined temperature. Thus, in the manufacturing method of the dissimilar metal material joined body of this embodiment, it is indispensable to join the plate-like members made of metal materials that can intersect the respective temperature-heat shrinkage rate curves. Normally, when the temperature at which bonding is performed (temperature at which bonding is completed) is the cooling start temperature, and the heat shrinkage rate of both metal materials at this temperature is “0 (%)”, the respective temperature-heat shrinkage. The rate curves will intersect. Unlike the case of the first metal material, the second metal material may or may not cause a phase transformation.

  Specific examples of the second metal material include a tungsten carbide base cemented carbide. Further, the tungsten carbide-based cemented carbide includes at least one tungsten carbide selected from the group consisting of iron (Fe), cobalt (Co), nickel (Ni), titanium (Ti), and chromium (Cr). An alloy sintered with a metal is preferable because it is particularly excellent in wear resistance and mechanical strength. Specific examples of the tungsten carbide-based cemented carbide include cemented carbide using Co as a binder, WC-0.1 to 50% by mass Co, and the like.

  In the manufacturing method of the dissimilar metal material joined body of this embodiment, at least one of the following operations (1) to (3) (operation (1), operation (2), operation (3)) is performed. Each operation will be specifically described below.

(Operation (1))
FIG. 2 is a schematic diagram illustrating the procedure of the operation (1). In operation (1), first, a test piece laminate 3 is prepared by laminating a first test piece 1 made of a first metal material and a second test piece 2 made of a second metal material. (FIG. 2 (a)). The shape and dimensions of the first test piece 1 and the second test piece 2 are not particularly limited. However, it is preferable to use one having the same shape and size as the first and second plate-like members constituting the dissimilar metal material joined body to be manufactured, or a shape and size equivalent thereto.

The prepared specimen laminate 3 is joined at a plurality of test joining temperatures (Tj ₁ , Tj ₂ ˜) higher than the temperature at which the first metal material undergoes austenite transformation, and a plurality of high-temperature specimen specimen assemblies 10 are joined. Is obtained (FIG. 2 (a)). The joining method is not particularly limited, but the joining can be performed by diffusion joining, brazing joining using a brazing material, or the like. Note that the test joining temperatures (Tj ₁ , Tj ₂ ˜) can be set to desired temperatures depending on the material of each test piece to be used and the type of brazing material when brazing material is used.

To cool a plurality of test strips joined body 10 obtained (FIG. 2 (b) ~ (d) ), measured in each of the test piece assemblies 10 weight warpage caused by normal temperature _{(C 1,} C 2 ~) (FIG. 2 (e)). In FIG. 2 (e), for the sake of convenience, a state in which the test piece assembly 10 is not warped (warp amount = 0) is shown. Usually, each test joint temperature (Tj ₁ , Tj ₂ ) is shown. Warp in accordance with (-) occurs (see FIG. 2C). Further, FIG. 2C shows a warped state that is convex toward the second test piece 2, but depending on conditions, it is convex toward the first test piece 1 (that is, the second test piece 2). It may be concave on the side of the piece 2. In this specification, for the sake of convenience, it is assumed that a negative amount of warpage occurs when the second test piece 2 is concave.

Based on the correlation between the test junction temperature (Tj ₁ , Tj ₂ ˜) and the measured warpage amounts (C ₁ , C ₂ ˜), the junction temperature (Tj) and the dissimilar metal material joined body corresponding to this The amount of warpage (C) generated in step (b) is predicted. FIG. 3 is a graph showing the correlation between the test bonding temperature and the warpage amount. The correlation between the test junction temperature (Tj ₁ , Tj ₂ ˜) and the amount of warpage (C ₁ , C ₂ ˜) is expressed by a function as shown in FIG. 3, for example. Specifically, the warpage amount C ₁ when bonding is performed at the test bonding temperature Tj ₁ = 820 ° C. is about −40 μm. On the other hand, the warpage amount C ₂ when bonding is performed at the test bonding temperature Tj ₂ = 1120 ° C. is about 80 μm. Accordingly, if the first plate member and the second plate member are bonded in a state where the bonding temperature Tj is set to 920 ° C., it is possible to manufacture a dissimilar metal material bonded body having no warpage (warpage amount C = 0). Can be predicted.

When the amount of warpage C ₁ generated in the test bonded body 10 obtained by bonding at the test bonding temperature Tj ₁ is a negative value (that is, concave on the second test piece 2 side). Next, bonding may be performed at a test junction temperature Tj ₂ that is significantly higher (for example, 100 ° C. or higher) than the test junction temperature Tj ₁ . On the other hand, the amount of warpage C ₁ generated in the test joined body 10 obtained by joining at the test joining temperature Tj ₁ is a positive value (that is, convex toward the second test piece 2 side). case, then, significantly than the test junction temperature Tj ₁ may be performed junction (e.g., 100 ° C. or higher) low test junction temperature Tj _2.

Further, if a large number of test junction temperatures (Tj ₁ , Tj ₂ ˜) are set, the correlation between the test junction temperature (Tj ₁ , Tj ₂ ˜) and the warpage amount (C ₁ , C ₂ ˜) can be more accurately determined. This is preferable because it can be grasped. However, in order to grasp this correlation, it is necessary to set at least two test junction temperatures (Tj ₁ and Tj ₂ ), and it is preferable to set three or more test junction temperatures.

Next, the first plate-like member and the second plate-like member are joined at the joining temperature (Tj) at which the predicted warpage amount (C) occurs. Since the correlation between the test bonding temperature (Tj ₁ , Tj ₂ ˜) and the warping amount (C ₁ , C ₂ ˜) is grasped by the above-described series of operations, for example, a flat dissimilar metal material joined body without warping Can be manufactured, and a dissimilar metal material joined body having a desired amount of warpage can also be manufactured.

(Operation (2))
FIG. 4 is a schematic diagram for explaining the procedure of the operation (2). In operation (2), first, a test piece laminate 13 is prepared by laminating a first test piece 11 made of a first metal material and a second test piece 12 made of a second metal material. (FIG. 4A). The shape and dimensions of the first test piece 11 and the second test piece 12 are not particularly limited. However, it is preferable to use one having the same shape and size as the first and second plate-like members constituting the dissimilar metal material joined body to be manufactured, or a shape and size equivalent thereto.

  The prepared test piece laminate 13 is bonded at a bonding temperature equal to or higher than the temperature at which the first metal material undergoes austenite transformation under the condition of a predetermined press pressure P, thereby obtaining a plurality of high-temperature test piece assemblies 20 ( FIG. 4 (a)). The press pressure P is usually about 0.1 to 100 MPa, although it depends on the shape and dimensions of each test piece. The joining method is not particularly limited, but the joining can be performed by diffusion joining, brazing joining using a brazing material, or the like.

The obtained plurality of test piece assemblies 20 are cooled while releasing the press pressure (FIG. 4B) at a plurality of test press pressure release temperatures (Tr ₁ , Tr ₂ ˜) (FIG. 4C˜). (F)). In FIG. 4 (f), for the sake of convenience, a state in which the test piece assembly 20 is not warped is shown (warp amount = 0). Usually, each test press pressure release temperature (Tr ₁ , Warpage according to Tr ₂ to) occurs (see FIG. 4D). Here, “pressing pressure release” in the present specification means releasing the pressing pressure applied at the time of joining and setting the pressure value to zero.

After cooling to room temperature, the amount of warpage (C ₁ , C ₂ ˜) generated at each room temperature of each test piece assembly 20 is measured (FIG. 4 (f)). Next, based on the correlation between the test press pressure release temperature (Tr ₁ , Tr ₂ ˜) and the measured warpage amounts (C ₁ , C ₂ ˜), the press pressure release temperature (Tr) and the corresponding dissimilarity Predict the amount of warpage (C) that occurs in the metal material joined body at room temperature. FIG. 5 is a graph showing the correlation between the test press pressure release temperature and the amount of warpage. The correlation between the test press pressure release temperature (Tr ₁ , Tr ₂ ˜) and the warpage amount (C ₁ , C ₂ ˜) is expressed by a linear function as shown in FIG. 5, for example. Specifically, the warping amount C ₁ when the press pressure is released at the test press pressure release temperature Tr ₁ = 150 ° C. is about −150 μm. On the other hand, when the press pressure is released at the test press pressure release temperature Tr ₂ = 200 ° C., the warpage amount C ₂ is about 220 μm. Therefore, if the press pressure is released at the press pressure release temperature Tr = 170 ° C., it can be predicted that a dissimilar metal material joined body having no warpage (warpage amount C = 0) can be produced.

The warpage amount C ₁ generated in the test bonded body 20 obtained by releasing the press pressure at the test press pressure release temperature Tr ₁ is a negative value (that is, a concave is formed on the second test piece 12 side). In this case, the press pressure may be released at a test press pressure release temperature Tr ₂ that is significantly higher (for example, 100 ° C. or higher) than the test press pressure release temperature Tr ₁ . On the other hand, the warpage amount C ₁ generated in the test bonded body 20 obtained by releasing the press pressure at the test press pressure release temperature Tr ₁ is a positive value (that is, convex toward the second test piece 12 side). Then, the press pressure may be released at a test press pressure release temperature Tr ₂ that is significantly lower (for example, 100 ° C. or more) than the test press pressure release temperature Tr ₁ .

Further, if a large number of test press pressure release temperatures (Tr ₁ , Tr ₂ ˜) are set, the correlation between the test press pressure release temperature (Tr ₁ , Tr ₂ ˜) and the warpage amount (C ₁ , C ₂ ˜) is obtained. It is preferable because it becomes possible to grasp more accurately. However, in order to grasp this correlation, it is necessary to set at least two test press pressure release temperatures (Tj ₁ and Tj ₂ ), and it is preferable to set three or more test press pressure release temperatures. .

Next, after joining the first plate-like member and the second plate-like member at a high temperature, cooling is performed while releasing the press pressure at the press pressure release temperature (Tr) at which the predicted warpage amount (C) occurs. Since the correlation between the test press pressure release temperature (Tr ₁ , Tr ₂ ˜) and the warpage amount (C ₁ , C ₂ ˜) is grasped by the series of operations described above, for example, a flat dissimilar metal material without warpage A joined body can be produced, and a joined body of dissimilar metal materials having a desired amount of warpage can be produced.

(Operation (3))
FIG. 6 is a schematic diagram for explaining the procedure of the operation (3). In operation (3), first, a test piece laminate 23 is prepared by laminating a first test piece 21 made of a first metal material and a second test piece 22 made of a second metal material. (FIG. 6A). The shape and dimensions of the first test piece 21 and the second test piece 22 are not particularly limited. However, it is preferable to use one having the same shape and size as the first and second plate-like members constituting the dissimilar metal material joined body to be manufactured, or a shape and size equivalent thereto.

  The prepared specimen laminate 23 is joined at a joining temperature equal to or higher than the temperature at which the first metal material undergoes austenite transformation, for example, under the condition of a predetermined pressing pressure P, thereby obtaining a plurality of high-temperature specimen specimen assemblies 30. (FIG. 6A). The press pressure P is usually about 0.01 to 100 MPa, although it depends on the shape and size of each test piece. The joining method is not particularly limited, but the joining can be performed by diffusion joining, brazing joining using a brazing material, or the like.

The obtained plurality of test piece assemblies 30 are cooled under conditions of a plurality of test press pressures (P ₁ , P ₂ ˜) (FIGS. 6B to 6E). In FIG. 6 (e), for the sake of convenience, a state in which the test piece assembly 30 is not warped (warp amount = 0) is shown. Usually, each test press pressure (P ₁ , P ₂ ) is shown. To warp occurs (see FIG. 6C).

After cooling to room temperature, the amount of warpage (C ₁ , C ₂ to) generated at each room temperature of each test piece assembly 30 is measured (FIG. 6E). Next, based on the correlation between the test press pressure (P ₁ , P ₂ ˜) and the warping amount (C ₁ , C ₂ ˜), the press pressure (P) and the corresponding dissimilar metal material joined body at normal temperature The amount of warpage (C) that occurs is predicted. FIG. 7 is a graph showing the correlation between the test press pressure and the amount of warpage. The correlation between the test press pressure (P ₁ , P ₂ ˜) and the warpage amount (C ₁ , C ₂ ˜) is expressed by a linear function as shown in FIG. 7, for example. Specifically, the warpage amount C ₁ when the test press pressure P ₁ is set to 0 MPa (that is, when not pressed) is about 80 μm. On the other hand, the warpage amount C ₂ when the test press pressure P ₂ is set to 11 MPa is about −40 μm. Therefore, if the press pressure P = 7.3 MPa, it can be predicted that a dissimilar metal material joined body having no warpage (warpage amount C = 0) can be produced.

When the warp amount C ₁ generated in the test bonded body 30 obtained as the test press pressure P ₁ is a positive value (that is, convex toward the second test piece 22), , significantly than the test pressing pressure _{P 1} (e.g., more than 10 MPa) may be higher test press pressure _{P 2.} On the other hand, when the amount of warpage C ₁ generated in the test bonded body 30 obtained as the test press pressure P ₁ is a negative value (that is, concave on the second test piece 22 side), Next, the test press pressure P ₂ is significantly lower (for example, 10 MPa or more) than the test press pressure P ₁ .

In addition, if a large number of test press pressures (P ₁ , P ₂ ˜) are set, the correlation between the test press pressure (P ₁ , P ₂ ˜) and the warpage amount (C ₁ , C ₂ ˜) can be more accurately determined. This is preferable because it can be grasped. However, in order to grasp this correlation, it is necessary to set at least two test press pressures (P ₁ and P ₂ ), and it is preferable to set three or more test press pressures.

Next, after joining the first plate-shaped member and the second plate-shaped member at a high temperature, the first plate-shaped member and the second plate-shaped member are cooled under the condition of the press pressure (P) at which the predicted warpage amount (C) is generated. Since the correlation between the test press pressure (P ₁ , P ₂ ˜) and the warping amount (C ₁ , C ₂ ˜) is grasped by the above-described series of operations, for example, a flat dissimilar metal material joined body without warping Can be manufactured, and a dissimilar metal material joined body having a desired amount of warpage can also be manufactured.

  In the manufacturing method of the dissimilar metal material joined body according to the present embodiment, at least one of the operations (1) to (3) described above may be performed. For simplicity, it is preferable to combine two or more of the operations (1) to (3), and it is also preferable to combine all the operations.

  Moreover, in the manufacturing method of the dissimilar metal material joined body of this embodiment, a brazing material is disposed between the first plate member and the second plate member, and the first plate member and the second plate member are arranged. It is preferable to join plate members. By disposing and joining the brazing material, the first plate member and the second plate member can be easily joined. However, if a layered brazing material remains in the manufactured dissimilar metal material joined body, the mechanical strength may decrease. Therefore, it is preferable to use a brazing material that is as thin as possible (for example, a foil). Moreover, it is preferable to use as the brazing material a material that penetrates into the structure of at least one of the first plate member and the second plate member. Specifically, it is preferable to use a brazing material containing at least one metal selected from the group consisting of copper (Cu), silver (Ag), gold (Au), nickel (Ni), and aluminum (Al). . In particular, a brazing material containing copper (Cu) has high permeability to alloys such as stainless steel, which are cited as preferred examples of the first plate-like member, and can be used favorably. In the case where the brazing material is an alloy, this brazing material includes palladium (Pd), silicon (Si), tin (Sn), cobalt (Co), phosphorus (P), manganese (Mn), zinc ( It is preferable that additives such as Zn) and boron (B) are further contained.

  When brazing material is used, there is no particular limitation on the thickness of the brazing material to be used. However, the thickness is preferably 0.1 to 200 μm, and more preferably 1 to 50 μm so as to penetrate well into at least one of the first plate member and the second plate member.

  In the manufacturing method of the dissimilar metal material joined body of this embodiment, there is no restriction | limiting in particular about the thickness of a 1st plate-shaped member and a 2nd plate-shaped member. For example, when manufacturing a general plate-shaped dissimilar metal material joined body, the thickness of the first plate-shaped member is preferably 1 to 100 mm. Moreover, it is preferable that the thickness of a 2nd plate-shaped member is 0.1-10 mm, It is more preferable that it is 0.1-3 mm, It is especially preferable that it is 0.1-1 mm or less.

  The obtained dissimilar metal material joined body only needs to satisfy the necessary and sufficient mechanical properties according to the purpose of use on the surface of the second plate-like member having excellent mechanical properties such as wear resistance. . Therefore, it is not necessary to make the second plate member thicker than necessary. On the other hand, the first plate-like member is easy to machine such as drilling and grooving, and is inexpensive. Therefore, it is preferable to use the second plate-like member for a portion that does not require special mechanical characteristics.

  According to the manufacturing method of the dissimilar metal material joined body of the present embodiment, as shown in FIG. 8, a first plate member 41 having a back hole 26 into which a forming raw material is introduced, and the forming raw material in a lattice shape. A base 50 for forming a honeycomb structure suitably used as various catalyst carriers, filters, etc. is manufactured by joining the second plate-like member 42 formed with slits 25 for forming into a single shape. can do.

  To manufacture the base 50 as shown in FIG. 8, as shown in FIG. 9, one of the first plate member 41 and the second plate member 42 (in FIG. 9, the first plate The back hole 26 is formed in the shaped member 41). The back hole 26 can be formed by a conventionally known processing method including, for example, electrolytic processing (ECM processing), electric discharge processing (EDM processing), laser processing, machining using a drill, and the like.

  If the first plate-like member 41 having the back hole 26 and the second plate-like member 42 are used and bonded by performing any of the operations (1) to (3) described above, A metal material joined body can be obtained. When the slit 25 is formed in the second plate-like member 42 constituting the obtained dissimilar metal material joined body, a die 50 for forming a honeycomb structure as shown in FIG. 10 can be manufactured. The slit 25 can be formed by a conventionally known processing method such as grinding with a diamond grindstone or electric discharge processing (EDM processing). In addition, if the member which consists of a tungsten carbide base cemented carbide is used as the 2nd plate-shaped member 42, the nozzle | cap | die 50 excellent in abrasion resistance can be manufactured.

  EXAMPLES Hereinafter, although this invention is demonstrated concretely based on an Example, this invention is not limited to these Examples.

Example 1
SUS630 (C; 0.07 mass% or less, Si; 1.00 mass% or less, Mn 1.00 mass% or less, P; 0.040 mass% or less, S; 0.030 mass% or less, Ni; 3.00 -5.00 mass%, Cr; 15.50-17.50 mass%, Cu; 3.00-5.00 mass%, Nb + Ta; 0.15-0.45 mass%, Fe; balance) A plate-like member (40 mm long × 40 mm wide × 1 mm thick) made of a tungsten carbide-based cemented carbide of WC-16 mass% Co and a plate-like member (length 40 mm × width 40 mm × thickness 11 mm) Two plate-like member laminates were obtained.

One plate-like member laminate was joined at Tj ₁ = 820 ° C. using active silver solder, and then cooled to room temperature (25 ° C.) to obtain a joined body. It was about -40 micrometers when the curvature amount which arose in the obtained joined body was measured with the surface shape measuring device. Also, the other plate-like member laminate, after bonding with Tj 2 ₌ 1120 ° C. using pure copper brazing, to obtain a bonded body was cooled to room temperature (25 ° C.). The amount of warpage generated in the obtained joined body was about 80 μm. Note that the temperature at which the austenite transformation of SUS630 occurs is about 720 to 900 ° C., and the temperature at which the martensitic transformation occurs is about 200 ° C. or less.

  Next, as shown in FIG. 3, a graph plotting the amount of warpage (μm) against the (test) bonding temperature (° C.) was prepared. The same thing as the above-mentioned plate-shaped member laminated body was prepared, it joined at Tj = 930 degreeC using the amorphous copper alloy brazing, Then, it cooled to normal temperature (25 degreeC), and the joined body was obtained. The amount of warpage generated in the obtained joined body was about 5 μm.

  As is apparent from the results of Example 1, by using the correlation between the bonding temperature and the warpage amount, it is possible to easily manufacture a dissimilar metal material joined body in which the warpage amount is controlled.

(Example 2)
In the same manner as in Example 1 described above, two plate-like member laminates were obtained (120 mm long × 120 mm wide). One plate-like member laminate was joined at 1120 ° C. under a press pressure of about 3.4 MPa, and then cooled to room temperature (25 ° C.) while releasing the press pressure at Tr ₁ = 150 ° C. Got. It was about -150 micrometers when the curvature amount which arose in the obtained joined body was measured. Also, the other plate-like member laminate, under conditions of a press pressure of approximately 3.4 MPa, after joining at 1120 ° _C., and cooled to room temperature (25 ° C.) while releasing the pressing pressure at Tr 2 = 200 ° C. A joined body was obtained. It was about 220 micrometers when the curvature amount which arose in the obtained joined body was measured.

  Next, as shown in FIG. 5, a graph plotting the amount of warp (μm) against the (test) press pressure release temperature (° C.) was prepared. Prepare the same plate-shaped member laminate as described above, and after joining at 1120 ° C. under a press pressure of about 3.4 MPa, to normal temperature (25 ° C.) while releasing the press pressure at Tr = 170 ° C. Cooled to obtain a joined body. It was about -20 micrometers when the amount of curvature which arose in the obtained joined object was measured.

  As is clear from the results of Example 2, by using the correlation between the press pressure release temperature and the warpage amount, it is possible to easily manufacture the dissimilar metal material joined body in which the warpage amount is controlled.

(Example 3)
In the same manner as in Example 1 described above, two plate-like member laminates were obtained (length 40 mm × width 40 mm). One plate-like member laminate was joined at 1120 ° C. under the condition of P ₁ = 0 (no press pressure), and then cooled to room temperature (25 ° C.) to obtain a joined body. It was 80 micrometers when the amount of curvature which arose in the obtained joined object was measured. The other plate-like member laminate was joined at 1120 ° C. under the condition of P ₂ = 11 MPa, and then cooled to room temperature (25 ° C.) while applying a press pressure to obtain a joined body. It was -40 micrometers when the amount of curvature which arose in the obtained joined object was measured.

  Next, a graph in which the amount of warpage (μm) was plotted against the (test) press pressure (MPa) as shown in FIG. 7 was prepared. Prepare the same plate-shaped member laminate as described above, join at 1120 ° C. under the condition of P = 7.3 MPa, and then cool to room temperature (25 ° C.) while applying the press pressure. Obtained. It was about -5 micrometers when the curvature amount which arose in the obtained joined body was measured.

  As is clear from the results of Example 3, by using the correlation between the press pressure and the warpage amount, it is possible to easily manufacture a dissimilar metal material joined body in which the warpage amount is controlled. Table 1 shows (test) joining temperature, (test) press pressure release temperature, and (test) press pressure, and the amount of warpage generated in the joined body corresponding to these.

  According to the method for manufacturing a joined body of dissimilar materials of the present invention, wear resistance and ease of processing are required at the same time, and it is necessary to have a strict shape. It is suitable as a method for manufacturing the parts.

It is the temperature-heat-shrinkage rate curve which plotted the heat-shrinkage rate with respect to temperature of SUS630 and a tungsten carbide base cemented carbide. It is a schematic diagram explaining the procedure of operation (1). It is a graph which shows the correlation of test joining temperature and curvature. It is a schematic diagram explaining the procedure of operation (2). It is a graph which shows the correlation of test press pressure release temperature and the amount of curvature. It is a schematic diagram explaining the procedure of operation (3). It is a graph which shows the correlation of a test press pressure and curvature. It is a fragmentary perspective view which shows an example of a nozzle | cap | die typically. It is a schematic diagram which shows a part of process of manufacturing a nozzle | cap | die. It is a fragmentary sectional view showing an example of a mouth typically.

Explanation of symbols

1, 11, 21 First test piece 2, 12, 22 Second test piece 3, 13, 23 Test piece laminate 10, 20, 30 Test piece assembly 25 Slit 26 Back hole 41 First plate-like member 42 Second plate-like member 50 Caps C, C ₁ , C ₂ Warp amounts P, P ₁ , P ₂ Test press pressure

Claims (6)

A first plate member made of a first metal material capable of causing at least one phase transformation selected from the group consisting of martensite transformation, bainite transformation, and pearlite transformation by cooling of the austenite phase;
Preparing a second plate-like member made of a second metal material whose temperature-heat shrinkage curve can intersect the temperature-heat shrinkage curve of the first metal material;
Including performing at least one of the following operations (1) to (3):
A method for producing a dissimilar metal material joined body, which obtains a dissimilar metal material joined body in which the first plate-like member and the second plate-like member are laminated and joined.
(1): A plurality of test piece laminates obtained by laminating a first test piece made of the first metal material and a second test piece made of the second metal material, the first metal material being Bonding at a plurality of test bonding temperatures (Tj ₁ , Tj ₂ ˜) higher than the temperature causing the austenite transformation, respectively, to obtain a plurality of high-temperature test piece assemblies,
While cooling the obtained plurality of test piece assemblies, the amount of warpage (C ₁ , C ₂ ~) generated at normal temperature in each of the test piece assemblies was measured,
Based on the correlation between the test junction temperature (Tj ₁ , Tj ₂ ˜) and the warp amount (C ₁ , C ₂ ˜), the dissimilar metal corresponding to the junction temperature (Tj) and the junction temperature (Tj) Predict the amount of warpage (C) that occurs in the bonded material at room temperature,
The first plate-like member and the second plate-like member are joined at the joining temperature (Tj) at which the warpage amount (C) occurs.
(2): A plurality of test piece laminates obtained by laminating a first test piece made of the first metal material and a second test piece made of the second metal material, under a predetermined press pressure condition. The first metal material is bonded at a bonding temperature equal to or higher than the temperature at which the austenite transformation occurs, to obtain a plurality of high-temperature test piece assemblies.
The plurality of obtained test piece assemblies were cooled while releasing the press pressure at a plurality of test press pressure release temperatures (Tr ₁ , Tr ₂ ˜), and each test piece assembly was generated at room temperature. warping amount _{(C 1,} C 2 ~) is measured,
Based on the correlation between the test press pressure release temperature (Tr ₁ , Tr ₂ ˜) and the warpage amount (C ₁ , C ₂ ˜), the press pressure release temperature (Tr) and the press pressure release temperature (Tr) Correspondingly, the amount of warpage (C) generated at room temperature in the dissimilar metal material joined body is predicted,
The press pressure release temperature (Tr) at which the warpage amount (C) occurs after the first plate member and the second plate member are joined at a temperature higher than the temperature at which the first metal material undergoes austenite transformation. To cool to room temperature while releasing the press pressure.
(3): A plurality of test piece laminates in which a first test piece made of the first metal material and a second test piece made of the second metal material are laminated, Bonding each at a bonding temperature equal to or higher than the temperature causing austenite transformation to obtain a plurality of high-temperature test piece assemblies,
The obtained plurality of test piece assemblies are cooled under conditions of a plurality of test press pressures (P ₁ , P ₂ to), and the amount of warpage (C ₁₎ generated in each test piece assembly at normal temperature. , to measure the _C 2 ~),
Based on the correlation between the test press pressure (P ₁ , P ₂ ˜) and the warpage amount (C ₁ , C ₂ ˜), the dissimilar metal corresponding to the press pressure (P) and the press pressure (P) Predict the amount of warpage (C) that occurs in the bonded material at room temperature,
Conditions for the press pressure (P) at which the warpage amount (C) occurs after the first plate member and the second plate member are joined at a temperature higher than the temperature at which the first metal material undergoes austenite transformation. Cool down to room temperature below. The dissimilar metal material joined body according to claim 1, wherein the first metal material is selected from an iron-based alloy, steel, and stainless steel .   The method for producing a dissimilar metal material joined body according to claim 1 or 2, wherein the second metal material is a tungsten carbide-based cemented carbide.   The dissimilar metal material according to claim 3, wherein the tungsten carbide-based cemented carbide is an alloy obtained by sintering tungsten carbide with at least one metal selected from the group consisting of iron, cobalt, nickel, titanium, and chromium. Manufacturing method of joined body.   The manufacturing method of the dissimilar metal-material joined body as described in any one of Claims 1-4 which arrange | positions a brazing material between said 1st plate-shaped member and said 2nd plate-shaped member.   6. The method for producing a dissimilar metal material joined body according to claim 5, wherein the brazing material contains at least one metal selected from the group consisting of copper, silver, gold, nickel, and aluminum.

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