CN111558795A - Titanium welding wire for additive repair of alpha + beta type titanium alloy and preparation method thereof - Google Patents
Titanium welding wire for additive repair of alpha + beta type titanium alloy and preparation method thereof Download PDFInfo
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- CN111558795A CN111558795A CN202010414074.5A CN202010414074A CN111558795A CN 111558795 A CN111558795 A CN 111558795A CN 202010414074 A CN202010414074 A CN 202010414074A CN 111558795 A CN111558795 A CN 111558795A
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- titanium alloy
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/32—Selection of soldering or welding materials proper with the principal constituent melting at more than 1550 degrees C
- B23K35/325—Ti as the principal constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
Abstract
The invention discloses a titanium welding wire for alpha + beta type titanium alloy additive repair and a preparation method thereof, wherein the titanium welding wire consists of Al, V, O, impurities and Ti, wherein the mass percent of Al in the titanium welding wire is 6.8-7.75%, the mass percent of V is 5.7-6.3%, the mass percent of O is less than 0.12%, and the mass percent of impurities is less than 0.2%.
Description
Technical Field
The invention belongs to the field of additive manufacturing, and relates to a titanium welding wire for additive repair of an alpha + beta type titanium alloy and a preparation method thereof.
Background
Titanium alloys have low modulus, good specific strength, excellent fatigue resistance, biocompatibility and corrosion resistance, and are widely used in commercial and industrial applications, such as aircraft fuselages, aircraft engine parts, biomedical implants, automotive parts, marine components, and the like. In addition, the alpha + beta type dual phase titanium alloy is used in the market in an amount of more than 50% of the total amount of the titanium alloy, while pure titanium accounts for only 26%. The using base number of the two-phase type titanium alloy is large, the number of the damaged components is high, and the repair of the damaged components is a main way for recovering economic loss. The number of the two-phase titanium alloy reaches more than 30, and the development of the corresponding repair material for each grade of alloy is uneconomical. Therefore, the development of the material capable of repairing the dual-phase titanium alloy with various types has wide application prospect.
For alpha + beta type dual phase titanium alloy, the alpha phase stabilizing elements include Al, Ga, Ge, O and the like, wherein Al is the most commonly used alpha stabilizing element at present, the function of Al in titanium is the same as that of C in steel, and Al mainly plays a role in limiting a beta phase region, increasing the transformation temperature of the beta phase and increasing the solubility of the beta stabilizing element in the alpha phase. All domestic alpha + beta type dual-phase titanium alloys almost use Al element as alpha phase stable element. The beta phase stabilizing elements comprise V, W, Mo, Fe, Cr and the like, wherein V is a body-centered cubic lattice which can be infinitely mutually dissolved with beta titanium, and can stabilize the beta phase so as to reduce the phase transition temperature of (alpha + beta)/beta. In addition, it can prevent eutectoid or peritectic reaction, reduce embrittlement of titanium alloy under certain conditions, and is the most used beta-phase stable element at present.
At present, the grades of alpha + beta type dual-phase titanium alloys in China begin with TC, and the titanium alloys of the grades almost contain Al elements and V elements. Wherein the addition amount of the alpha phase stabilizing element is below 8 percent, and the addition amount of the beta phase stabilizing element is 2 to 10 percent. In order to realize good chemical component matching and phase matching of most alpha + beta type dual-phase titanium alloys, Al element is supposed to be alpha phase stable element, V element is supposed to be beta phase stable element, a titanium alloy welding wire suitable for repairing a plurality of alpha + beta type dual-phase titanium alloys is prepared, and reliable material guarantee is provided for repairing damaged dual-phase titanium alloy components.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a titanium welding wire for additive repair of alpha + beta type titanium alloy and a preparation method thereof.
In order to achieve the purpose, the titanium welding wire for the additive repair of the alpha + beta type titanium alloy consists of Al, V, O, impurities and Ti, wherein the mass percent of the Al in the titanium welding wire is 6.8-7.75%, the mass percent of the V in the titanium welding wire is 5.7-6.3%, the mass percent of the O in the titanium welding wire is less than 0.12%, and the mass percent of the impurities in the titanium welding wire is less than 0.2%.
The preparation method of the titanium welding wire for the additive repair of the alpha + beta type titanium alloy comprises the following steps:
1) weighing Al-55V intermediate alloy, aluminum beans and titanium sponge, mixing the Al-55V intermediate alloy, the aluminum beans and the titanium sponge, and pressing into a plurality of consumable electrode blocks;
2) welding the power-consuming electrode blocks obtained in the step 1) into consumable electrodes under the protection of argon;
3) carrying out vacuum consumable arc melting on the consumable electrode obtained in the step 2) to obtain a titanium alloy ingot, cutting off a riser, and peeling;
4) casting the titanium alloy obtained in the step 3) into a titanium alloy bar;
5) drawing the square bar of the rolling mill obtained in the step 4) to obtain a titanium alloy wire;
6) and (3) carrying out peeling die drawing brightening treatment on the titanium alloy wire rod obtained in the step 5) to obtain the titanium welding wire for the additive repair of the alpha + beta type titanium alloy.
The mixing time in the step 1) is 5min-10 min;
the specific operation process of the step 4) is as follows: forging the alloy cast ingot into a rolling mill square bar by a forging machine at 1050-1100 ℃ through 2-3 times of fire, then performing deformation rolling on the rolling mill square bar into a titanium alloy bar by a hole-type bar hot continuous rolling mill at 940-980 ℃ through 6-8 times;
the specific operation process of the step 5) is as follows: and drawing the titanium alloy bar into a titanium alloy wire rod by 8-10 passes at the temperature of 800-900 ℃ by adopting a turntable hot wire drawing machine.
The alpha phase stable element Al and the beta phase stable element V contained in the welding wire are matched with the chemical components and phases of the alpha + beta type titanium alloy to be repaired.
The equivalent weight K alpha of the alpha phase stable element of the alpha + beta type titanium alloy to be repaired is within the range of 5-9.
The equivalent weight Kbeta of the beta phase stable element of the alpha + beta type titanium alloy to be repaired is within the range of 4-8.
Kα＝Al(wt.％)+Sn(wt.％)/3+Zr(wt.％)/6。
Kβ＝V(wt.％)+Mo(wt.％)+W(wt.％)+Fe(wt.％)/2+Cr(wt.％)/2。
The invention has the following beneficial effects:
according to the titanium welding wire for the additive repair of the alpha + beta type titanium alloy and the preparation method thereof, during specific operation, the alpha phase stable element Al and the beta phase stable element V contained in the welding wire are matched with the chemical components and phases of the alpha + beta type titanium alloy to be repaired, so that the titanium welding wire can be suitable for repairing the alpha + beta type dual-phase titanium alloy, through tests, the bonding strength of a repairing layer repaired by the welding wire and a component exceeds 5% of the strength of the component, and the fracture elongation reaches 70% of the component;
drawings
FIG. 1 is a schematic view of an ingot obtained by twice vacuum consumable melting of an alloy;
FIG. 2 is a drawing showing a drawing
A schematic diagram of a titanium alloy welding wire;
FIG. 3 is taken around the shaft
A schematic diagram of a titanium alloy welding wire;
FIG. 4 is a schematic diagram of a sample of a bonding surface sample and a repair layer sample;
FIG. 5 is a comparison of tensile curves for the TC4 alloy, bonding surface, repair layer;
FIG. 6 is a comparison of tensile curves for the TC10 alloy, the faying surface, and the repair layer.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
the titanium welding wire for the additive repair of the alpha + beta type titanium alloy consists of Al, V, O, impurities and Ti, wherein the mass percent of the Al in the titanium welding wire is 6.8-7.75%, the mass percent of the V is 5.7-6.3%, the mass percent of the O is less than 0.12%, and the mass percent of the impurities is less than 0.2%.
The preparation method of the titanium welding wire for the additive repair of the alpha + beta type titanium alloy comprises the following steps:
1) weighing Al-55V intermediate alloy, aluminum beans and titanium sponge, mixing the Al-55V intermediate alloy, the aluminum beans and the titanium sponge, and pressing into a plurality of consumable electrode blocks by a 500T oil press, wherein the consumable electrode blocks have the size of 50 multiplied by 300 mm;
the material mixing time in the step 1) is 5-10min, and the mass ratio of the Al-55V intermediate alloy, the aluminum beans and the titanium sponge is 5-10 min.
2) Welding the power-consuming electrode blocks obtained in the step 1) into consumable electrodes under the protection of argon;
3) carrying out twice vacuum consumable arc melting on the consumable electrode obtained in the step 2) to obtain
The titanium alloy ingot casting is performed, then a dead head is cut off, and the skin is peeled off;
4) casting the titanium alloy obtained in the step 3) into a titanium alloy bar;
the concrete process of the step 4) is that the alloy cast ingot is forged into a rolling mill square bar of 50 × 50 × Lmm for 2-3 times by a forging machine at 1050-1100 ℃, and then the rolling mill square bar is deformed and rolled into the alloy cast ingot by a hole type bar hot continuous rolling mill for 6-8 times at 940-980 DEG C
Titanium alloy bar stock of (2);
5) drawing the square bar of the rolling mill obtained in the step 4) to obtain a titanium alloy wire;
the specific process of the step 5) is as follows: the titanium alloy bar is drawn into the titanium alloy bar by a turntable hot wire drawing machine for 8 to 10 times at the temperature of between 800 and 900 DEG C
The titanium alloy wire of (1).
6) Carrying out peeling die drawing brightening treatment on the titanium alloy wire rod obtained in the step 5) to obtain
The α + β titanium alloy additive repair titanium welding wire.
The alpha phase stable element Al and the beta phase stable element V contained in the welding wire are matched with the chemical components and phases of the alpha + beta type titanium alloy to be repaired.
The heat source used in the additive repair process is laser, electric arc, plasma arc or electron beam and the like. The equivalent weight K alpha of the alpha phase stable element of the alpha + beta type titanium alloy to be repaired is within the range of 5-9; the equivalent weight K beta of a beta-phase stabilizing element of the alpha + beta type titanium alloy to be repaired is within the range of 4-8, wherein K alpha is Al (wt%) + Sn (wt%)/3 + Zr (wt%)/6; k β ═ V (wt.%) + Mo (wt.%) + W (wt.%) + Fe (wt.%)/2 + Cr (wt.%)/2.
The wire samples were analyzed for chemical composition and are shown in table 1:
TABLE 1 titanium alloy wire chemistry (wt.%)
Example one
The material to be repaired in this embodiment is TC4, and it can be found by calculation that the equivalent K α of the α -phase stabilizing element of TC4 is about 6, and the equivalent K β of the β -phase stabilizing element is about 4, which is within the scope of the welding wire repair of the present invention. And performing laser wire filling additive repair on a TC4 plate with the thickness of 10mm by taking laser as a heat source under the argon protective atmosphere, wherein the thickness of a repair layer is 10 mm. Wherein, the laser power is 3000W, the scanning speed is 0.028m/s, and the wire feeding speed is 0.064 m/s. And then, respectively taking tensile samples of the bonding surface and the repairing layer for mechanical property analysis, wherein the sampling of the tensile samples is schematically shown in figure 1. The tensile curves of the TC4 base material, the bonding surface, and the repair layer are shown in fig. 2, and the TC4 base material has a tensile strength of 1152MPa and a tensile strain at break of 29%. The tensile strength of the joint surface is 1140MPa, which is similar to the strength of TC4 base material; the tensile strain at break was 22% and reached more than 70% of the TC4 substrate. The tensile strength of the repairing layer is 1200MPa and exceeds 5 percent of the strength of the TC4 base material; the tensile strain at break was 21% and reached 70% of the TC4 substrate.
Example two
The material to be repaired in this embodiment is TC10, and it can be found by calculation that the equivalent K α of the α -phase stabilizing element of TC10 is about 7, and the equivalent K β of the β -phase stabilizing element is about 6.25, which is within the scope of the welding wire repair of the present invention. And performing laser wire filling additive repair on a TC10 plate with the thickness of 10mm by taking laser as a heat source under the argon protective atmosphere, wherein the thickness of a repair layer is 10 mm. Wherein, the laser power is 3000W, the scanning speed is 0.028m/s, and the wire feeding speed is 0.064 m/s. And then, respectively taking tensile samples of the bonding surface and the repairing layer for mechanical property analysis, wherein the sampling of the tensile samples is schematically shown in figure 1. As shown in FIG. 3, the tensile curves of the TC10 base material, the bonding surface, and the repair layer are respectively 1090MPa for the TC10 base material tensile strength and 29% tensile strain at break. The tensile strength of the joint surface is 1105MPa, which is similar to the strength of TC10 base material; the tensile strain at break was 21% and reached 70% of the TC10 substrate. The tensile strength of the repairing layer is 1220MPa and exceeds 10 percent of the strength of the TC10 base material; the tensile strain at break was 22% and reached more than 70% of the TC10 substrate.
Claims (8)
1. The titanium welding wire for the additive repair of the alpha + beta type titanium alloy is characterized by comprising 6.8-7.75 mass percent of Al, 5.7-6.3 mass percent of V, less than 0.12 mass percent of O and less than 0.2 mass percent of impurities.
2. The preparation method of the titanium welding wire for the additive repair of the alpha + beta type titanium alloy as claimed in claim 1, is characterized by comprising the following steps:
1) weighing Al-55V intermediate alloy, aluminum beans and titanium sponge, mixing the Al-55V intermediate alloy, the aluminum beans and the titanium sponge, and pressing into a plurality of consumable electrode blocks;
2) welding the power-consuming electrode blocks obtained in the step 1) into consumable electrodes under the protection of argon;
3) carrying out vacuum consumable arc melting on the consumable electrode obtained in the step 2) to obtain a titanium alloy ingot, cutting off a riser, and peeling;
4) casting the titanium alloy obtained in the step 3) into a titanium alloy bar;
5) drawing the square bar of the rolling mill obtained in the step 4) to obtain a titanium alloy wire;
6) and (3) carrying out peeling die drawing brightening treatment on the titanium alloy wire rod obtained in the step 5) to obtain the titanium welding wire for the additive repair of the alpha + beta type titanium alloy.
3. The preparation method of the titanium welding wire for the additive repair of the alpha + beta type titanium alloy according to claim 2, wherein the mixing time in the step 1) is 5min to 10 min;
the specific operation process of the step 4) is as follows: forging the alloy cast ingot into a rolling mill square bar by a forging machine at 1050-1100 ℃ through 2-3 times of fire, then performing deformation rolling on the rolling mill square bar into a titanium alloy bar by a hole-type bar hot continuous rolling mill at 940-980 ℃ through 6-8 times;
the specific operation process of the step 5) is as follows: and drawing the titanium alloy bar into a titanium alloy wire rod by 8-10 passes at the temperature of 800-900 ℃ by adopting a turntable hot wire drawing machine.
4. The method for preparing the titanium welding wire for the additive repair of the alpha + beta type titanium alloy according to claim 2, wherein the alpha phase stabilizing element Al and the beta phase stabilizing element V contained in the welding wire are matched with the chemical components and phases of the alpha + beta type titanium alloy to be repaired.
5. The preparation method of the titanium welding wire for additive repair of the alpha + beta type titanium alloy according to claim 4, wherein the equivalent weight K alpha of the alpha phase stabilizing element of the alpha + beta type titanium alloy to be repaired is within a range of 5-9.
6. The preparation method of the titanium welding wire for the additive repair of the alpha + beta type titanium alloy according to claim 4, wherein the equivalent weight Kbeta of the beta phase stable element of the alpha + beta type titanium alloy to be repaired is within a range of 4-8.
7. The method for preparing a titanium welding wire for additive repair of α + β type titanium alloy according to claim 5, wherein K α ═ Al (wt%) + Sn (wt%)/3 + Zr (wt%)/6.
8. The method for preparing a titanium welding wire for additive repair of α + β type titanium alloy according to claim 6, wherein K β ═ V (wt%) + Mo (wt%) + W (wt%) + Fe (wt%)/2 + Cr (wt%)/2.
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Cited By (2)
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| CN117102732A (en) * | 2023-10-23 | 2023-11-24 | 中国机械总院集团沈阳铸造研究所有限公司 | TC4 titanium alloy welding wire for arc additive manufacturing and additive manufacturing method thereof |
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| CN112872654A (en) * | 2021-02-23 | 2021-06-01 | 哈尔滨焊接研究院有限公司 | TC4 titanium alloy solid welding wire for large-thickness ultra-narrow gap laser filler wire welding and preparation method thereof |
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