CN104611610A - High-temperature and high-strength titanium alloy and preparation method thereof - Google Patents
High-temperature and high-strength titanium alloy and preparation method thereof Download PDFInfo
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Abstract
The present invention discloses a high-temperature and high-strength titanium alloy and a preparation method thereof, and belongs to the technical field of titanium alloy materials. The high-temperature and high-strength titanium alloy comprises, by weight, 6.0-7.0% of Al, 2-4% of Sn, 3.5-3.8% of Zr, 0.2-0.5% of Hf, ] 0.3-0.8% of Ta, 0.5-1.5% of W, 0.2-0.5% of Si, and the balance of Ti, wherein the sum of Zr and Hf is 4%, and the sum of Nb and Ta is 1.5-3%. According to the present invention, vacuum self-consumption electric arc furnace melting, cogging, middle forging, rolling, and annealing or solution aging treatment are adopted to obtain the titanium alloy with the tensile strength of not less than 720 MPa at a temperature of 650 DEG C, the tensile strength of not less than 580 MPa at a temperature of 700 DEG C, and the lasting breaking time of not less than 30 min at 700 DEG C/350 Mpa; and the high-temperature and high-strength titanium alloy meets the application requirements on the titanium alloy under the short-term high-temperature and high-strength conditions.
Description
Technical field
The present invention relates to titanium alloy material field, be specifically related to a kind of high strength at high temperature Ti-Al-Sn-Zr (Hf)-Nb (Ta)-W-Si Alloy And Preparation Method.
Background technology
High-temperature titanium alloy has the advantages such as proportion is little, specific tenacity is high, corrosion resistance and good, in field widespread uses such as aerospace.The research of existing high-temperature titanium alloy is mainly that demand is carried out with aviation, high-temperature work environment (being no more than 600 DEG C) when main performance index is to meet aircraft engine long, need alloy have good hot strength, high temperature long time low-stress durable creeping performance and thermal stability and fatigue property preferably, based on bar and forging.Along with the development of space industry, high-strength demand such as the short time high temperature for high-speed aircraft etc., needs to put forward heavy alloyed hot strength, and has good durable creeping performance in short-term under a large load, simultaneously the special superplastic formation performance focusing on alloy, based on sheet material.Existing typical high-temperature titanium alloy has the Ti60 etc. of the Ti-1100 of the U.S., the IMI834 of Britain, Muscovite BT36 and China, and use temperature is no more than 600 DEG C, cannot meet the in short-term high-strength requirement of space industry to high-temperature titanium alloy.
Summary of the invention
The object of the invention is to propose a kind of can at 700 DEG C and following high strength at high temperature Ti-Al-Sn-Zr (Hf)-Nb (the Ta)-W-Si Alloy And Preparation Method applied in short-term.
A kind of High temperature and high strength titanium alloy, it is characterized in that: the composition of this High temperature and high strength titanium alloy and the weight percent of each component concentration thereof are Al:6.0 ~ 7.0%, Sn:2 ~ 4%, Zr:3.5 ~ 3.8%, Hf:0.2 ~ 0.5%, and Zr and Hf sum is 4%, Ta is 0.3 ~ 0.8% and Nb and Ta sum is 1.5 ~ 3%, W:0.5 ~ 1.5%, Si:0.2 ~ 0.5%, surplus is Ti, and the content sum of above-mentioned each component is 100%.
Room temperature (about the 25 DEG C) tensile strength of above-mentioned High temperature and high strength titanium alloy is not less than 1150MPa, and unit elongation is not less than 8%; Tensile strength at 650 DEG C is not less than 720MPa, and the tensile strength at 700 DEG C is not less than 580MPa; Under 700 DEG C/350MPa condition, the stress rupture time is not less than 30min.
The room temperature tensile intensity of above-mentioned High temperature and high strength titanium alloy is 1170-1300MPa, and unit elongation is 10-18%; Tensile strength at 650 DEG C is 720-800MPa; Tensile strength at 700 DEG C is 580-670MPa; Under 700 DEG C/350MPa condition, the stress rupture time is 35-90min.
A preparation method for above-mentioned High temperature and high strength titanium alloy, concrete technology step is:
(1) prepare burden according to following weight percent: Al:6.0 ~ 7.0%, Sn:2 ~ 4%, Zr:3.5 ~ 3.8%, Hf:0.2 ~ 0.5%, and Zr and Hf sum is 4%, Nb and Ta sum is 1.5 ~ 3% and Ta is 0.3 ~ 0.8%, W:0.5 ~ 1.5%, Si:0.2 ~ 0.5%, surplus is Ti; The raw material taken is pressed into consumable electrode, in vacuum consumable electrode arc furnace, is smelted into titan alloy casting ingot;
(2) by above-mentioned titan alloy casting ingot 1100 ~ 1150 DEG C of coggings, after centre forging, rolling, annealing or fixation rates, obtain High temperature and high strength titanium alloy.
Wherein:
Raw material described in step (1) is sponge Ti, firearm level sponge Zr, sponge Hf, Al beans, Ti-80Sn master alloy, Al-75Nb master alloy, Al-40Ta master alloy, Ti-30W master alloy and Ti-50Si master alloy;
Melting in step (1) completes through 3 fire;
Middle forging temperature in step (2) is 1030 DEG C ~ 1090 DEG C, and middle forging completes through 2 ~ 3 fire, and every fire time deflection is not less than 50%;
Rolling temperature in step (2) is 950 ~ 1030 DEG C, and total deformation is not less than 75%, and adding showing tremendous enthusiasm time is 2 ~ 3 times.
High strength at high temperature Ti-Al-Sn-Zr (Hf)-Nb (Ta)-W-Si alloy of the present invention, vacuum consumable smelting is adopted to add cogging forging, middle forging, hot-rolled process, carry out room temperature tensile test according to GB GB/T228-2002 method, carry out drawing by high temperature test according to GB/T4338-2006 method.The tensile property of described alloy is: room temperature tensile intensity is not less than 1150MPa, and unit elongation is not less than 8%; Tensile strength at 650 DEG C is not less than 720MPa, and the tensile strength at 700 DEG C is not less than 580MPa.Carry out enduring quality test according to GB GB/T2039-1997 method, described alloy property is that the stress rupture time is not less than 30min under 700 DEG C/350MPa condition; Ti-Al-Sn-Zr of the present invention (Hf)-Nb (Ta)-W-Si alloy material is at 700 DEG C and have excellent room temperature and mechanical behavior under high temperature coupling below, can meet the application demand to titanium alloy under the high-strength condition of short time high temperature.
Embodiment
Below in conjunction with specific embodiment, the present invention is described further, but not thereby limit content of the present invention.
Material in the following example all can be bought by commercial sources, and wherein used experimental technique if no special instructions, is ordinary method.
Embodiment 1: preparation Ti-6.5Al-3Sn-3.7Zr-0.3Hf-2Nb-0.5Ta-1W-0.3Si alloy
(1) Ti-6.5Al-3Sn-3.7Zr-0.3Hf-2Nb-0.5Ta-1W-0.3Si alloy, starting material are 0 grade of sponge Ti, firearm level sponge Zr, sponge Hf, Al beans, Ti-80Sn master alloy, Al-75Nb master alloy, Al-40Ta master alloy, Ti-30W master alloy, Ti-50Si master alloy, prepare burden according to composition proportion, consumable electrode is pressed into after mixing, through three meltings in vacuum consumable electrode arc furnace, obtain Ti-6.5Al-2Sn-3.7Zr-0.3Hf-2Nb-0.5Ta-1W-0.3Si alloy cast ingot;
(2) by alloy cast ingot 1130 DEG C of coggings, be then swaged into slab through middle, Forge Heating temperature is down to 1030 DEG C gradually by 1080 DEG C, and middle forging 3 fire completes, and the secondary deflection of every fire is not less than 50%; Then through three fire time rollings, be rolled at 970 DEG C the sheet material that thickness is 3mm;
(3) above-mentioned obtained sheet material is carried out 980 DEG C/1h/ air cooling (AC)+600 DEG C/2h/AC fixation rates.
Material property: carry out the test of room temperature tensile, drawing by high temperature and high temperature endurance performance respectively according to GB GB/T228-2002, GB/T4338-2006, GB/T2039-1997 method.Alloy At Room Temperature tensile strength 1240MPa, unit elongation 15%; Under the tensile strength 770MPa of 650 DEG C, the tensile strength 640MPa of 700 DEG C, 700 DEG C/350MPa condition, the stress rupture time is 70min.
Compare existing typical titanium alloy to significantly improve, as Ti60 alloy, the tensile strength 670MPa of 650 DEG C.
Embodiment 2: preparation Ti-6Al-2Sn-3.5Zr-0.5Hf-1.2Nb-0.3Ta-0.5W-0.2Si alloy
(1) Ti-6Al-2Sn-3.5Zr-0.5Hf-1.2Nb-0.3Ta-0.5W-0.2Si alloy, starting material are 0 grade of sponge Ti, firearm level sponge Zr, sponge Hf, Al beans, Ti-80Sn master alloy, Al-75Nb master alloy, Al-40Ta master alloy, Ti-30W master alloy, Ti-50Si master alloy, carry out preparing burden and being pressed into consumable electrode according to composition proportion, through three meltings in vacuum consumable electrode arc furnace, obtain Ti-6Al-2Sn-3.5Zr-0.5Hf-1.2Nb-0.3Ta-0.5W-0.2Si alloy cast ingot;
(2) by alloy cast ingot 1110 DEG C of coggings, be then swaged into excellent base through middle, Forge Heating temperature is down to 1030 DEG C gradually by 1070 DEG C, and middle forging 2 fire completes, and the secondary deflection of every fire is not less than 50%; Then through two fire time rollings, be rolled at 980 DEG C the bar that diameter is 12mm;
(3) above-mentioned obtained bar is carried out 800 DEG C/2h/AC anneal.
Material property: carry out the test of room temperature tensile, drawing by high temperature and high temperature endurance performance according to GB GB/T228-2002, GB/T4338-2006, GB/T2039-1997 method.Room temperature tensile intensity 1170MPa, unit elongation 18%; Under the tensile strength 720MPa of 650 DEG C, the tensile strength 580MPa of 700 DEG C, 700 DEG C/350MPa condition, the stress rupture time is 35min.
Embodiment 3: preparation Ti-7Al-4Sn-3.8Zr-0.2Hf-2.5Nb-0.5Ta-1.5W-0.5Si alloy
(1) Ti-7Al-4Sn-3.8Zr-0.2Hf-2.5Nb-0.5Ta-1.5W-0.5Si alloy, starting material are 0 grade of sponge Ti, firearm level sponge Zr, sponge Hf, Al beans, Ti-80Sn master alloy, Al-75Nb master alloy, Al-40Ta master alloy, Ti-30W master alloy, Ti-50Si master alloy, carry out preparing burden and being pressed into consumable electrode according to composition proportion, through three meltings in vacuum consumable electrode arc furnace, obtain Ti-7Al-4Sn-3.8Zr-0.2Hf-2.5Nb-0.5Ta-1.5W-0.5Si alloy cast ingot;
(2) by alloy cast ingot 1140 DEG C of coggings, be then swaged into excellent base through middle, Forge Heating temperature is down to 1040 DEG C gradually by 1080 DEG C, and middle forging 2 fire completes, and the secondary deflection of every fire is not less than 50%; Then through three fire time rollings, be rolled at 970 DEG C the bar that diameter is 16mm;
(3) above-mentioned obtained bar is carried out 990 DEG C/1h/AC+600 DEG C/2h/AC fixation rates.
Material property: carry out the test of room temperature tensile, drawing by high temperature and high temperature endurance performance respectively according to GB GB/T228-2002, GB/T4338-2006, GB/T2039-1997 method.Room temperature tensile intensity 1300MPa, unit elongation 12%; Under the tensile strength 670MPa of 700 DEG C, 700 DEG C/350MPa condition, the stress rupture time is 90min.
Embodiment 4: preparation Ti-6.8Al-3.5Sn-3.5Zr-0.5Hf-2.2Nb-0.8Ta-0.5W-0.3Si alloy
(1) Ti-6.8Al-3.5Sn-3.5Zr-0.5Hf-2.2Nb-0.8Ta-0.5W-0.3Si alloy, starting material are 0 grade of sponge Ti, firearm level sponge Zr, sponge Hf, Al beans, Ti-80Sn master alloy, Al-75Nb master alloy, Al-40Ta master alloy, Ti-30W master alloy, Ti-50Si master alloy, carry out preparing burden and being pressed into consumable electrode according to composition proportion, through three meltings in vacuum consumable electrode arc furnace, obtain Ti-6.8Al-3.5Sn-3.5Zr-0.5Hf-2.2Nb-0.8Ta-0.5W-0.3Si alloy cast ingot;
(2) by alloy cast ingot 1120 DEG C of coggings, be then swaged into slab through middle, Forge Heating temperature is down to 1030 DEG C gradually by 1070 DEG C, and middle forging 2 fire completes, and the secondary deflection of every fire is not less than 50%; Then through two fire time rollings, be rolled at 970 DEG C the sheet material that thickness is 6mm;
(3) above-mentioned obtained sheet material is carried out 980 DEG C/2h/AC anneal.
Material property: carry out the test of room temperature tensile, drawing by high temperature and high temperature endurance performance respectively according to GB GB/T228-2002, GB/T4338-2006, GB/T2039-1997 method.Room temperature tensile intensity 1260MPa, unit elongation 14%; Under the tensile strength 645MPa of 700 DEG C, 700 DEG C/350MPa condition, the stress rupture time is 65min.
Embodiment 5: preparation Ti-6.0Al-2Sn-3.6Zr-0.4Hf-2.7Nb-0.3Ta-1.5W-0.5Si alloy
(1) Ti-6.0Al-2Sn-3.6Zr-0.4Hf-2.7Nb-0.3Ta-1.5W-0.5Si alloy, starting material are 0 grade of sponge Ti, firearm level sponge Zr, sponge Hf, Al beans, Ti-80Sn master alloy, Al-75Nb master alloy, Al-40Ta master alloy, Ti-30W master alloy, Ti-50Si master alloy, carry out preparing burden and being pressed into consumable electrode according to composition proportion, through three meltings in vacuum consumable electrode arc furnace, obtain Ti-6.0Al-2Sn-3.6Zr-0.4Hf-2.7Nb-0.3Ta-1.5W-0.5Si alloy cast ingot;
(2) by alloy cast ingot 1100 DEG C of coggings, be then swaged into slab through middle, Forge Heating temperature is down to 1030 DEG C gradually by 1070 DEG C, and middle forging 3 fire completes, and the secondary deflection of every fire is not less than 50%; Then through three fire time rollings, be rolled at 950 DEG C the sheet material that thickness is 1mm;
(3) above-mentioned obtained sheet material is carried out 970 DEG C/1h+600 DEG C/2h fixation rates.
Material property: carry out the test of room temperature tensile, drawing by high temperature and high temperature endurance performance respectively according to GB GB/T228-2002, GB/T4338-2006, GB/T2039-1997 method.Room temperature tensile intensity 1180MPa, unit elongation 14%; Under the tensile strength 590MPa of 700 DEG C, 700 DEG C/350MPa condition, the stress rupture time is 40min.
Embodiment 6: preparation Ti-7Al-4Sn-3.5Zr-0.5Hf-1.2Nb-0.3Ta-0.5W-0.2Si alloy
(1) Ti-7Al-4Sn-3.5Zr-0.5Hf-1.2Nb-0.3Ta-0.5W-0.2Si alloy, starting material are 0 grade of sponge Ti, Al beans, firearm level sponge Zr, sponge Hf, Ti-80Sn master alloy, Al-75Nb master alloy, Al-40Ta master alloy, Ti-30W master alloy, Ti-50Si master alloy, carry out preparing burden and being pressed into consumable electrode according to composition proportion, through three meltings in vacuum consumable electrode arc furnace, obtain Ti-7Al-4Sn-3.5Zr-0.5Hf-1.2Nb-0.3Ta-0.5W-0.2Si alloy cast ingot;
(2) by alloy cast ingot 1150 DEG C of coggings, be then swaged into slab through middle, Forge Heating temperature is down to 1050 DEG C gradually by 1090 DEG C, and middle forging 3 fire completes, and the secondary deflection of every fire is not less than 50%; Then through three fire time rollings, be rolled at 980 DEG C the sheet material that thickness is 3mm;
(3) above-mentioned obtained sheet material is carried out 990 DEG C/1h+600 DEG C/2h fixation rates.
Material property: carry out the test of room temperature tensile, drawing by high temperature and high temperature endurance performance respectively according to GB GB/T228-2002, GB/T4338-2006, GB/T2039-1997 method.Alloy At Room Temperature tensile strength 1285MPa, unit elongation 10%; 650 DEG C of tensile strength 800MPa; 700 DEG C of tensile strength 660MPa; Under 700 DEG C/350MPa condition, the stress rupture time is 75min.
Embodiment 7: preparation Ti-6.5Al-2Sn-3.7Zr-0.3Hf-2.5Nb-0.5Ta-0.5W-0.3Si alloy
(1) Ti-6.5Al-2Sn-3.7Zr-0.3Hf-2.5Nb-0.5Ta-0.5W-0.3Si alloy, starting material are 0 grade of sponge Ti, firearm level sponge Zr, sponge Hf, Al beans, Ti-80Sn master alloy, Al-75Nb master alloy, Al-Ta master alloy, Ti-30W master alloy, Ti-50Si master alloy, carry out preparing burden and being pressed into consumable electrode according to composition proportion, through three meltings in vacuum consumable electrode arc furnace, obtain Ti-6.5Al-2Sn-3.7Zr-0.3Hf-2.5Nb-0.5Ta-0.5W-0.3Si alloy cast ingot;
(2) by alloy cast ingot 1130 DEG C of coggings, through two fire time in the middle of forging, Forge Heating temperature is down to 1040 DEG C gradually by 1080 DEG C, makes slab; Then through 3 fire time rollings, be rolled at 960 DEG C the sheet material that thickness is 12mm;
(3) above-mentioned obtained sheet material is carried out 980 DEG C/1h+600 DEG C/2h fixation rates.
Material property: carry out the test of room temperature tensile, drawing by high temperature and high temperature endurance performance respectively according to GB GB/T228-2002, GB/T4338-2006, GB/T2039-1997 method.Alloy At Room Temperature tensile strength 1255MPa, unit elongation 15%; Under the tensile strength 760MPa of 650 DEG C, the tensile strength 630MPa of 700 DEG C, 700 DEG C/350MPa condition, the stress rupture time is 45min.
Claims (6)
1. a High temperature and high strength titanium alloy, it is characterized in that: the composition of this High temperature and high strength titanium alloy and the weight percent of each component concentration thereof are Al:6.0 ~ 7.0%, Sn:2 ~ 4%, Zr:3.5 ~ 3.8%, Hf:0.2 ~ 0.5%, and Zr and Hf sum is 4%, Ta is 0.3 ~ 0.8% and Nb and Ta sum is 1.5 ~ 3%, W:0.5 ~ 1.5%, Si:0.2 ~ 0.5%, surplus is Ti.
2. the preparation method of the High temperature and high strength titanium alloy described in claim 1, is characterized in that, concrete grammar comprises the following steps:
(1) prepare burden according to following weight percent: Al:6.0 ~ 7.0%, Sn:2 ~ 4%, Zr:3.5 ~ 3.8%, Hf:0.2 ~ 0.5%, and Zr and Hf sum is 4%, Nb and Ta sum is 1.5 ~ 3% and Ta is 0.3 ~ 0.8%, W:0.5 ~ 1.5%, Si:0.2 ~ 0.5%, surplus is Ti; The raw material taken is pressed into consumable electrode, in vacuum consumable electrode arc furnace, is smelted into titan alloy casting ingot;
(2) by above-mentioned titan alloy casting ingot 1100 ~ 1150 DEG C of coggings, after centre forging, rolling, annealing or fixation rates, obtain High temperature and high strength titanium alloy.
3. preparation method according to claim 2, it is characterized in that, raw material described in step (1) is sponge Ti, firearm level sponge Zr, sponge Hf, Al beans, Ti-80Sn master alloy, Al-75Nb master alloy, Al-40Ta master alloy, Ti-30W master alloy and Ti-50Si master alloy.
4. preparation method according to claim 2, is characterized in that, step (1) described melting completes through 3 fire.
5. preparation method according to claim 2, is characterized in that, in the middle of described in step (2), the temperature of forging controls between 1030 DEG C ~ 1090 DEG C; Middle forging completes through 2-3 fire; Every fire time deflection is not less than 50%.
6. preparation method according to claim 2, is characterized in that, described in step (2), the temperature of rolling is 950 ~ 1030 DEG C, and adding showing tremendous enthusiasm time is 2 ~ 3 times.
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| CN108165820A (en) * | 2016-12-08 | 2018-06-15 | 北京有色金属研究总院 | A kind of strong heat-resistant titanium alloy of superelevation and sheet alloy and preparation method in short-term |
| CN108893628A (en) * | 2018-08-03 | 2018-11-27 | 中鼎特金秦皇岛科技股份有限公司 | A kind of low elastic modulus erosion resistant titanium alloy and preparation method thereof |
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| CN112322936A (en) * | 2020-11-05 | 2021-02-05 | 北京航空航天大学 | Anti-oxidation high-temperature titanium alloy and preparation method thereof |
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| RU2675011C1 (en) * | 2017-12-14 | 2018-12-14 | Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" | Method of manufacturing flat products from hafnium-containing alloy based on titanium |
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