CN102828058A - Preparation method of low-cost titanium alloy - Google Patents
Preparation method of low-cost titanium alloy Download PDFInfo
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- CN102828058A CN102828058A CN2012103588069A CN201210358806A CN102828058A CN 102828058 A CN102828058 A CN 102828058A CN 2012103588069 A CN2012103588069 A CN 2012103588069A CN 201210358806 A CN201210358806 A CN 201210358806A CN 102828058 A CN102828058 A CN 102828058A
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Abstract
The invention discloses a preparation method of a low-cost titanium alloy, comprising the following steps of: 1, evenly mixing titanium powder with MoFe intermediate alloy power in proportion on the basis of the nominal composition of Ti-1.5Fe-2.5Mo alloy, so that mixed powder can be obtained; 2, forming the mixed powder in a compression way by isostatic cool pressing, so that a powder pressed shape can be obtained; and 3, sintering the powder pressed shape under the vacuum condition with the temperature from 1250DEG C to 1350DEG C, so that the Ti-1.5Fe-2.5Mo alloy can be obtained. The preparation method takes pure titanium powder with coarser granularity as a raw material, so that the oxygen content in the titanium powder can be greatly reduced, therefore, the oxygen content in the alloy can be controlled, the plasticity and the fatigue property of a Ti-1.5Fe-2.5Mo alloy part can be further improved, the relative density of the prepared alloy is more than 97%, the tensile strength of the prepared alloy is more than 850MPa, the elongation of the prepared alloy is not less than 15%, and the cross-section shrinking percentage of the prepared alloy is not less than 20%.
Description
Technical field
The invention belongs to titanium alloy and prepare technical field, be specifically related to a kind of preparation method of low-cost titanium alloy.
Background technology
Titanium has light specific gravity, and is corrosion-resistant, and series of advantages such as specific tenacity height are widely used in fields such as aerospace, boats and ships, biomedicine, motor vehicles for civilian use.But titanium refine with the course of processing in elements such as easy and O, N, H react, so tooling cost is higher, has limited its widespread use at civil area.
Ti-1.5Fe-2.5Mo (wt%) is a kind of titanium alloy that application prospect is arranged on automobile, can be used for making assemblies such as drain tap.But compare with iron and steel, its cost is still higher.Preparing fine and close prefab earlier through the powder metallurgical technique of element mixing, compacting, densification sintering, again through forging manufacturing procedure, is an approach making the low-cost titanium alloy auto parts.But the cost that powder metallurgical technique is selected for use is lower, hydrogenation dehydrogenation (HDH) ti powder or the titanium hydride powders (D of granularity thin (being beneficial to densification sintering)
50=10～20 μ m), its oxygen level higher (4000～6000ppm) or sintering process in because removing of hydrogen is easy to generate crackle, thereby reduced the performances such as plasticity and fatigue of part.
In order to improve performances such as plasticity and fatigue, it is elements such as interpolation Rare Earth Y that a kind of approach is arranged, and other composition of corresponding fine setting, through REE " purification " effect to oxygen in the alloy, improves performances such as alloy plasticity and fatigue.But, can not effectively reduce cost of parts through the approach that adds REE along with the lifting of rare earth price.
Summary of the invention
Technical problem to be solved by this invention is to above-mentioned deficiency of the prior art a kind of preparation method of low-cost titanium alloy to be provided.It is raw material that this method adopts the thicker pure titanium valve of granularity; Because reducing of titanium valve specific surface area; Greatly reduce the titanium valve oxygen level, thereby control the oxygen level in the Ti-1.5Fe-2.5Mo alloy, further improved the plasticity and the fatigue property of Ti-1.5Fe-2.5Mo alloy part; Do not need extra interpolation rare earth element y and other elemental composition of adjustment in the preparation process; Can obtain all Ti-1.5Fe-2.5Mo alloys preferably of plasticity and fatigue property; Simultaneously need not use titanium hydride powders; Reduce the alloy production cost, simplified production technique, increased the stability of alloy part performance; In addition; Optimize densification sintering temperature and soaking time through adjustment, powder sintered neck is well grown, thereby improved the density of Ti-1.5Fe-2.5Mo alloy; The specific density of the Ti-1.5Fe-2.5Mo alloy of preparation reaches more than 97%; Tensile strength reaches more than the 850MPa, and unit elongation is not less than 15%, and relative reduction in area is not less than 20%.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of preparation method of low-cost titanium alloy is characterized in that this method may further comprise the steps:
Step 1, titanium valve and MoFe master alloy powder are mixed by proportioning, obtain mixed powder according to the nominal composition of Ti-1.5Fe-2.5Mo alloy; The quality percentage composition of Fe is 1.5% in the said Ti-1.5Fe-2.5Mo alloy, and the quality percentage composition of Mo is 2.5%, and surplus is Ti and other unavoidable impurities; The mean particle size of said titanium valve is 45 μ m～80 μ m, and the oxygen mass content of titanium valve is 1700ppm～2800ppm; The mean particle size of said MoFe master alloy powder is 30 μ m～74 μ m, the oxygen mass content≤3000ppm of MoFe master alloy powder;
Step 2, with mixed powder described in the step 1 through the compression moulding of isostatic cool pressing mode, obtain powder compact;
Step 3, powder compact described in the step 2 being placed high temperature sintering furnace, is sintering 3h～4h under 1250 ℃～1350 ℃ the vacuum condition in temperature, and obtaining specific density is the Ti-1.5Fe-2.5Mo alloy more than 97%.
The preparation method of above-mentioned a kind of low-cost titanium alloy, titanium valve described in the step 1 is not more than 0.001% pure titanium valve for the hydrogen quality percentage composition of hydrogenation dehydriding preparation.
The preparation method of above-mentioned a kind of low-cost titanium alloy controls the oxygen level in the Ti-1.5Fe-2.5Mo alloy through the granularity of adjustment titanium valve, thereby reaches the purpose that improves the alloy over-all properties, and reduces cost of alloy.
The present invention compared with prior art has the following advantages:
1, the present invention adopts granularity thicker, i.e. mean particle size (D
50) be that the pure titanium valve of 45 μ m～80 μ m is a raw material; Because reducing of titanium valve specific surface area; Greatly reduce titanium valve oxygen level (1700ppm～2800ppm); Thereby control the oxygen level in the Ti-1.5Fe-2.5Mo alloy, further improved the plasticity and the fatigue property of Ti-1.5Fe-2.5Mo alloy part.
2, the present invention adopts mean particle size (D
50) be the pure titanium valve of 45 μ m～80 μ m; And mean particle size is that the MoFe master alloy powder of 30 μ m～74 μ m is a raw material; Optimize densification sintering temperature and soaking time through adjustment, powder sintered neck is well grown, thereby improved the density of Ti-1.5Fe-2.5Mo alloy.
3, the present invention does not need extra interpolation rare earth element y and adjusts other elemental composition, can obtain all Ti-1.5Fe-2.5Mo alloys preferably of plasticity and fatigue property; Simultaneously need not use titanium hydride powders, reduce the alloy production cost, simplify production technique, increase the stability of alloy part performance.
4, adopt the specific density of the Ti-1.5Fe-2.5Mo alloy of method preparation of the present invention to reach more than 97%, tensile strength reaches more than the 850MPa, and unit elongation is not less than 15%, and relative reduction in area is not less than 20%.
Below in conjunction with accompanying drawing and embodiment, technical scheme of the present invention is done further to describe in detail.
Description of drawings
Fig. 1 is the micro-organization chart of the Ti-1.5Fe-2.5Mo alloy of the embodiment of the invention 1 preparation.
Fig. 2 is the micro-organization chart of the Ti-1.5Fe-2.5Mo alloy of the embodiment of the invention 2 preparations.
Fig. 3 is the micro-organization chart of the Ti-1.5Fe-2.5Mo alloy of the embodiment of the invention 3 preparations.
Embodiment
Embodiment 1
Step 1, place mixer to mix by proportioning titanium valve and MoFe master alloy powder, obtain mixed powder according to the nominal composition of Ti-1.5Fe-2.5Mo alloy; The quality percentage composition of Fe is 1.5% in the said Ti-1.5Fe-2.5Mo alloy, and the quality percentage composition of Mo is 2.5%, and surplus is Ti and other unavoidable impurities; Said titanium valve is not more than 0.001% pure titanium valve for the hydrogen quality percentage composition of hydrogenation dehydriding preparation, and its mean particle size is 45 μ m, and the oxygen mass content is 2800ppm; The mean particle size of said MoFe master alloy powder is 30 μ m, and the oxygen mass content of MoFe master alloy powder is 3000ppm;
Step 2, mixed powder described in the step 1 is packed in the isostatic cool pressing rubber coating of Φ 50mm * 200mm, be not less than the moulding of 200MPa condition pressed at pressing pressure, obtain powder compact through the isostatic cool pressing mode;
Step 3, powder compact described in the step 2 being placed high temperature sintering furnace, is (vacuum tightness≤1 * 10 under 1350 ℃ the vacuum condition in temperature
-2Pa) sintering 3h, obtaining specific density is the Ti-1.5Fe-2.5Mo alloy more than 99%.
Fig. 1 is the micro-organization chart of the Ti-1.5Fe-2.5Mo alloy of present embodiment preparation, and as can be seen from the figure, alloy is densification basically, and defective is few, reaches malleable level.
Present embodiment is controlled the oxygen level in the Ti-1.5Fe-2.5Mo alloy through the granularity of adjusting pure titanium valve; Thereby reach the purpose that improves the alloy over-all properties; And reduction cost of alloy; Ti-1.5Fe-2.5Mo tensile strength of alloys >=the 860MPa of preparation, unit elongation >=15%, relative reduction in area >=20%.
Embodiment 2
Step 1, place mixer to mix by proportioning titanium valve and MoFe master alloy powder, obtain mixed powder according to the nominal composition of Ti-1.5Fe-2.5Mo alloy; The quality percentage composition of Fe is 1.5% in the said Ti-1.5Fe-2.5Mo alloy, and the quality percentage composition of Mo is 2.5%, and surplus is Ti and other unavoidable impurities; Said titanium valve is not more than 0.001% pure titanium valve for the hydrogen quality percentage composition of hydrogenation dehydriding preparation, and its mean particle size is 53 μ m, and the oxygen mass content is 2400ppm; The mean particle size of said MoFe master alloy powder is 60 μ m, and the oxygen mass content of MoFe master alloy powder is 2500ppm;
Step 2, mixed powder described in the step 1 is packed in the isostatic cool pressing rubber coating of Φ 50mm * 200mm, be not less than the moulding of 200MPa condition pressed at pressing pressure, obtain powder compact through the isostatic cool pressing mode;
Step 3, powder compact described in the step 2 being placed high temperature sintering furnace, is (vacuum tightness≤1 * 10 under 1300 ℃ the vacuum condition in temperature
-2Pa) sintering 3.5h, obtaining specific density is the Ti-1.5Fe-2.5Mo alloy more than 98.8%.
Fig. 2 is the micro-organization chart of the Ti-1.5Fe-2.5Mo alloy of present embodiment preparation, and as can be seen from the figure, alloy is densification basically, and defective is few, reaches malleable level.
Present embodiment is controlled the oxygen level in the Ti-1.5Fe-2.5Mo alloy through the granularity of adjusting pure titanium valve; Thereby reach the purpose that improves the alloy over-all properties; And reduction cost of alloy; Ti-1.5Fe-2.5Mo tensile strength of alloys >=the 860MPa of preparation, unit elongation >=16%, relative reduction in area >=23%.
Embodiment 3
Step 1, place mixer to mix by proportioning titanium valve and MoFe master alloy powder, obtain mixed powder according to the nominal composition of Ti-1.5Fe-2.5Mo alloy; The quality percentage composition of Fe is 1.5% in the said Ti-1.5Fe-2.5Mo alloy, and the quality percentage composition of Mo is 2.5%, and surplus is Ti and other unavoidable impurities; Said titanium valve is not more than 0.001% pure titanium valve for the hydrogen quality percentage composition of hydrogenation dehydriding preparation, and its mean particle size is 80 μ m, and the oxygen mass content is 1700ppm; The mean particle size of said MoFe master alloy powder is 74 μ m, and the oxygen mass content of MoFe master alloy powder is 1000ppm;
Step 2, mixed powder described in the step 1 is packed in the isostatic cool pressing rubber coating of Φ 50mm * 200mm, be not less than the moulding of 200MPa condition pressed at pressing pressure, obtain powder compact through the isostatic cool pressing mode;
Step 3, powder compact described in the step 2 being placed high temperature sintering furnace, is (vacuum tightness≤1 * 10 under 1250 ℃ the vacuum condition in temperature
-2Pa) sintering 4h, obtaining specific density is the Ti-1.5Fe-2.5Mo alloy more than 97%.
Fig. 3 is the micro-organization chart of the Ti-1.5Fe-2.5Mo alloy of present embodiment preparation, and as can be seen from the figure, alloy is densification basically, and defective is less, reaches malleable level.
Embodiment controls the oxygen level in the Ti-1.5Fe-2.5Mo alloy through the granularity of adjusting pure titanium valve; Thereby reach the purpose that improves the alloy over-all properties, and reduce cost of alloy, the Ti-1.5Fe-2.5Mo tensile strength of alloys >=850MPa of preparation; Unit elongation >=18%, relative reduction in area >=25%.
The above; It only is preferred embodiment of the present invention; Be not that the present invention is done any restriction, every technical spirit changes any simple modification, change and the equivalence that above embodiment did according to the present invention, all still belongs in the protection domain of technical scheme of the present invention.
Claims (3)
1. the preparation method of a low-cost titanium alloy is characterized in that, this method may further comprise the steps:
Step 1, titanium valve and MoFe master alloy powder are mixed by proportioning, obtain mixed powder according to the nominal composition of Ti-1.5Fe-2.5Mo alloy; The quality percentage composition of Fe is 1.5% in the said Ti-1.5Fe-2.5Mo alloy, and the quality percentage composition of Mo is 2.5%, and surplus is Ti and other unavoidable impurities; The mean particle size of said titanium valve is 45 μ m～80 μ m, and the oxygen mass content of titanium valve is 1700ppm～2800ppm; The mean particle size of said MoFe master alloy powder is 30 μ m～74 μ m, the oxygen mass content≤3000ppm of MoFe master alloy powder;
Step 2, with mixed powder described in the step 1 through the compression moulding of isostatic cool pressing mode, obtain powder compact;
Step 3, powder compact described in the step 2 being placed high temperature sintering furnace, is sintering 3h～4h under 1250 ℃～1350 ℃ the vacuum condition in temperature, and obtaining specific density is the Ti-1.5Fe-2.5Mo alloy more than 97%.
2. the preparation method of a kind of low-cost titanium alloy according to claim 1 is characterized in that, titanium valve described in the step 1 is not more than 0.001% pure titanium valve for the hydrogen quality percentage composition of hydrogenation dehydriding preparation.
3. the preparation method of a kind of low-cost titanium alloy according to claim 1 is characterized in that, controls the oxygen level in the Ti-1.5Fe-2.5Mo alloy through the granularity of adjustment titanium valve, thereby reaches the purpose that improves the alloy over-all properties, and reduces cost of alloy.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104087785A (en) * | 2014-07-14 | 2014-10-08 | 大连理工大学 | Ti-base Ti-Fe-Y biological medical alloy and preparation method thereof |
| CN109097628A (en) * | 2018-10-10 | 2018-12-28 | 广州宇智科技有限公司 | A kind of novel fire resistant titanium alloy that the 500-600 degree under non-oxidizing atmosphere uses |
| CN109794606A (en) * | 2019-03-11 | 2019-05-24 | 广东省材料与加工研究所 | A kind of titanium alloy and preparation method thereof |
| CN111172424A (en) * | 2020-01-17 | 2020-05-19 | 西部金属材料股份有限公司 | Titanium alloy for daily necessities and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1584079A (en) * | 2004-05-24 | 2005-02-23 | 西北有色金属研究院 | Low-cost superplastic titanium alloy |
| CN101239395A (en) * | 2008-03-12 | 2008-08-13 | 贵州钛易科技发展有限责任公司 | Powder metallurgy method for preparing high-density complicated shape titanium alloy product |
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2012
- 2012-09-24 CN CN201210358806.9A patent/CN102828058B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1584079A (en) * | 2004-05-24 | 2005-02-23 | 西北有色金属研究院 | Low-cost superplastic titanium alloy |
| CN101239395A (en) * | 2008-03-12 | 2008-08-13 | 贵州钛易科技发展有限责任公司 | Powder metallurgy method for preparing high-density complicated shape titanium alloy product |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104087785A (en) * | 2014-07-14 | 2014-10-08 | 大连理工大学 | Ti-base Ti-Fe-Y biological medical alloy and preparation method thereof |
| CN104087785B (en) * | 2014-07-14 | 2016-08-24 | 大连理工大学 | A kind of Ti base Ti-Fe-Y biomedical alloy and preparation method thereof |
| CN109097628A (en) * | 2018-10-10 | 2018-12-28 | 广州宇智科技有限公司 | A kind of novel fire resistant titanium alloy that the 500-600 degree under non-oxidizing atmosphere uses |
| CN109794606A (en) * | 2019-03-11 | 2019-05-24 | 广东省材料与加工研究所 | A kind of titanium alloy and preparation method thereof |
| CN109794606B (en) * | 2019-03-11 | 2020-04-28 | 广东省材料与加工研究所 | Titanium alloy and preparation method thereof |
| CN111172424A (en) * | 2020-01-17 | 2020-05-19 | 西部金属材料股份有限公司 | Titanium alloy for daily necessities and preparation method thereof |
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