CN1490100A - Manufacture of lightweight refractory titanium-aluminum based alloy exhaust gates - Google Patents
Manufacture of lightweight refractory titanium-aluminum based alloy exhaust gates Download PDFInfo
- Publication number
- CN1490100A CN1490100A CN02133203.7A CN02133203A CN1490100A CN 1490100 A CN1490100 A CN 1490100A CN 02133203 A CN02133203 A CN 02133203A CN 1490100 A CN1490100 A CN 1490100A
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- China
- Prior art keywords
- casting
- power
- based alloy
- aluminum based
- lightweight refractory
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 20
- 239000000956 alloy Substances 0.000 title claims abstract description 20
- UQZIWOQVLUASCR-UHFFFAOYSA-N alumane;titanium Chemical compound [AlH3].[Ti] UQZIWOQVLUASCR-UHFFFAOYSA-N 0.000 title claims description 11
- 238000004519 manufacturing process Methods 0.000 title abstract description 3
- 238000005516 engineering process Methods 0.000 claims abstract description 14
- 238000003723 Smelting Methods 0.000 claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 5
- 230000006698 induction Effects 0.000 claims abstract description 5
- 239000010959 steel Substances 0.000 claims abstract description 5
- 238000009750 centrifugal casting Methods 0.000 claims abstract description 3
- 238000005266 casting Methods 0.000 claims description 31
- 238000002844 melting Methods 0.000 claims description 17
- 230000008018 melting Effects 0.000 claims description 17
- 238000002360 preparation method Methods 0.000 claims description 10
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 5
- 239000004594 Masterbatch (MB) Substances 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 239000000155 melt Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- PEQFPKIXNHTCSJ-UHFFFAOYSA-N alumane;niobium Chemical compound [AlH3].[Nb] PEQFPKIXNHTCSJ-UHFFFAOYSA-N 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- -1 rafifinal bits Chemical compound 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 description 9
- 238000001513 hot isostatic pressing Methods 0.000 description 4
- 229910052758 niobium Inorganic materials 0.000 description 4
- 239000010955 niobium Substances 0.000 description 4
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 210000001161 mammalian embryo Anatomy 0.000 description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 208000020442 loss of weight Diseases 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Abstract
A technology for manufacturing the exhaust valve with refractory light TiAl-base alloy includes such steps as smelting in consumable electroarc furnace, smelting again in the crucible of induction furnace, and centrifugal casting under the condition that power is 280+/-10 KW, the mould made of die steel is preheated to 500-580 deg.C and the rotation speed is 300-500 rpm. Its product features high surface quality and internal uniformity, high tension strength and percentage elongation, and high working temp up to 850 DEG C.
Description
Technical field:
The present invention relates to employed exhaust valve in the automotive industry, a kind of preparation method of lightweight refractory titanium-aluminum based alloy exhaust gates is provided especially.
Background technique:
Its structural material of employed exhaust valve is a steel in the automotive industry at present, and its major defect is that valve body is heavy, and serviceability temperature is below 650 ℃.Titanium aluminium base alloy is owing to its tempting performance advantage, and its application area is expanded in civil area gradually.The method of induction melting is often adopted in the melting of titanium alloy, but has the relatively poor problem of high-melting-point element uniformity.People once utilized powder metallurgy method to prepare the exhaust valve base, but cost is higher and complex process.Adopt the method for die spinning can reduce the cost of production of exhaust valve largely, but up to the present still do not see relevant report.
The technology contents of invention:
The object of the present invention is to provide a kind of preparation method of lightweight refractory titanium-aluminum based alloy exhaust gates, can produce high-quality lightweight refractory titanium-aluminum based alloy exhaust gates with this method, and preparation cost is lower.
The invention provides a kind of preparation method of lightweight refractory titanium-aluminum based alloy exhaust gates, it is characterized in that adopting the secondary smelting technology, promptly carry out melting once in the consumable electroarc furnace, in induction melting furnace, carry out secondary smelting in the crucible, and the centrifugal casting moulding, casting technology is:
Casting power 280 ± 10kW, casting mold adopts material to be mainly the metal mold of the formula of the inserting structure of die steel, and inlet length is 80～150mm, and the casting mold preheating temperature is 500～800 ℃, and the turntable rotating speed is 300～500r/min.
Among the preparation method of lightweight refractory titanium-aluminum based alloy exhaust gates of the present invention, the concrete technology of melting for the second time can for: at first ingot casting is carried out the baking of low-power heat, to melt power then is increased to 250 ± 10kW to carry out the insulation of 8 ± 1min even until the masterbatch temperature, further improve melting power to 320 ± 10kW and be incubated 4 ± 1min, furnace charge melts the back fully and reduces power to the power of casting.
Among the preparation method of lightweight refractory titanium-aluminum based alloy exhaust gates of the present invention, the raw material that melting is for the first time adopted are titanium sponge, rafifinal bits, chromium powder and aluminium niobium intermediate alloy.
The present invention has taken all factors into consideration the influence to casting surface and internal soundness of casting power, casting mold structure process parameter and casting technology parameter, pass through process parameter optimizing, make foundry goods when obtaining better surface quality, its inner microcosmic shrinkage porosite distributes along the foundry goods central axis, has improved the casting yield behind the hot isostatic pressing.By the casting technology parameter optimization, after carrying out hot isostatic pressing, all bending phenomenon occurs for foundry goods.According to standard procedure exhaust valve embryo spare is carried out obtaining finished product after hot isostatic pressing, machining, the surface treatment.
In a word, adopt the inventive method casting gained exhaust valve to have surface quality preferably, the microcosmic shrinkage porosite distributes along the foundry goods center line, and 12 groups of embryo spares that are used for hot isostatic pressing all do not occur bending and deformation.Exhaust valve microstructure after hip treatment is the bifurcation tissue, has homogeneity of ingredients preferably, and particularly high-melting-point alloy elemental chromium and niobium have all been realized even distribution.Room temperature tensile strength is about 580MPa, and specific elongation is about 2%; High temperature (815 ℃) tensile strength is about 470MPa, and specific elongation is about 10%, satisfies the requirement of exhaust valve working environment.Use this exhaust valve can realize valve body loss of weight about 50%, operating temperature is brought up to about 850 ℃ by original 600 ℃.
Embodiment:
According to the alloy theory composition prepare burden the back (raw material that adopted are titanium sponge, rafifinal bits, chromium powder and aluminium niobium intermediate alloy, the employing of intermediate alloy more helps the fusing of high-melting-point alloy elemental niobium), bulk cargo is suppressed into the column bar on hydraulic press, two groups of bars are welded together in consumable electroarc furnace, carry out melting once, be smelted into the column ingot casting.In induction melting furnace, carry out secondary smelting in the crucible, at first ingot casting is carried out the baking of low-power heat, to melt power then is increased to 250kW to carry out the insulation of 8min even until the masterbatch temperature, further raising melting power is to 320kW and be incubated 4min, furnace charge melts the back fully and reduces power and cast to 280kW, adopt secondary smelting technology, the foundry goods of producing has homogeneity of ingredients preferably.
Casting mold adopts structural material to be mainly the metal mold of die steel, adopts the formula structure of inserting, and its entrance length is 80～150mm.It is 500～800 ℃ that preheating temperature is split in casting, and the turntable rotating speed of employing is 300～500r/min.
Embodiment 1
The turntable rotating speed is 300r/min, and inlet length is 100mm, and the casting mold preheating temperature is 500 ℃;
Directly cast when melting power is brought up to 250kW, have unfused crome metal and niobium in the casting pressing port;
Melting power is that 320kW casts, and the casting surface current mark spreads all over, even burr occurs;
To melt power and be increased to 250kW and be incubated until the masterbatch temperature evenly, and further improve melting power to 320kW, furnace charge melts the back fully and reduces power and cast to 280kW, not fusant do not occur, and surface quality of continuous castings is good, and chromium and niobium are evenly distributed.
Embodiment 2
The turntable rotating speed is 300r/min, and the casting mold preheating temperature is 500 ℃, adopts secondary smelting technology:
When entrance length was 40mm, foundry goods took place serious crooked after hip treatment;
When entrance length was 70mm, foundry goods slightly bent after hip treatment;
When entrance length was 100mm, foundry goods did not bend after hip treatment;
Embodiment 3
The turntable rotating speed is 300r/min, adopts secondary smelting technology:
When casting mold not being carried out preheating, the obvious shrinkage cavity of the inner appearance of foundry goods;
When the casting mold preheating temperature was 300 ℃, the foundry goods internal soundness was slightly improved;
When the casting mold preheating temperature was 500 ℃, the foundry goods internal soundness was further improved;
Embodiment 4
Inlet length is 100mm, and the casting mold preheating temperature is 500 ℃, adopts secondary smelting technology:
Under static conditions, cast the tangible shrinkage defect of the inner appearance of foundry goods;
When the turntable rotating speed was 150r/min, the shrinkage defect of foundry goods inside improved;
When the turntable rotating speed was 300r/min, the foundry goods internal soundness was further improved.
Claims (3)
1, a kind of preparation method of lightweight refractory titanium-aluminum based alloy exhaust gates is characterized in that adopting the secondary smelting technology, promptly carries out melting once in the consumable electroarc furnace, carries out secondary smelting in induction melting furnace in the crucible, and the centrifugal casting moulding, and casting technology is:
Casting power 280 ± 10kW, casting mold adopts material to be mainly the metal mold of the formula of the inserting structure of die steel, and inlet length is 80～150mm, and the casting mold preheating temperature is 500～800 ℃, and the turntable rotating speed is 300～500r/min.
2, according to the preparation method of the described lightweight refractory titanium-aluminum based alloy exhaust gates of claim 1, the concrete technology that it is characterized in that described secondary smelting is: at first ingot casting is carried out the baking of low-power heat, to melt power then is increased to 250 ± 10kW to carry out the insulation of 8 ± 1min even until the masterbatch temperature, further improve melting power to 320 ± 10kW and be incubated 4 ± 1min, furnace charge melts the back fully and reduces power to the power of casting.
3,, it is characterized in that the raw material that described melting once adopts are titanium sponge, rafifinal bits, chromium powder and aluminium niobium intermediate alloy according to the preparation method of the described lightweight refractory titanium-aluminum based alloy exhaust gates of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02133203.7A CN1213824C (en) | 2002-10-17 | 2002-10-17 | Manufacture of lightweight refractory titanium-aluminum based alloy exhaust gates |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02133203.7A CN1213824C (en) | 2002-10-17 | 2002-10-17 | Manufacture of lightweight refractory titanium-aluminum based alloy exhaust gates |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1490100A true CN1490100A (en) | 2004-04-21 |
| CN1213824C CN1213824C (en) | 2005-08-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN02133203.7A Expired - Fee Related CN1213824C (en) | 2002-10-17 | 2002-10-17 | Manufacture of lightweight refractory titanium-aluminum based alloy exhaust gates |
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| CN (1) | CN1213824C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102493853A (en) * | 2011-12-12 | 2012-06-13 | 长春工业大学 | Titanium aluminum based powder metallurgy material for automobile engine exhaust doors and manufacturing method of titanium aluminum based powder metallurgy material |
| CN104439042A (en) * | 2014-09-25 | 2015-03-25 | 安徽嘉木橡塑工业有限公司 | Raw materials and process for casting valve seat rings |
| CN104741588A (en) * | 2015-02-14 | 2015-07-01 | 中钢集团邢台机械轧辊有限公司 | Manufacturing method of ICDP roller working layer |
| CN104959571A (en) * | 2015-06-17 | 2015-10-07 | 陈文建 | Titanium alloy forging method |
| CN113637858A (en) * | 2021-07-14 | 2021-11-12 | 上海大学 | TiAl-based alloy based on two-step composite smelting process and preparation method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101564763B (en) * | 2009-05-15 | 2011-01-05 | 哈尔滨工业大学 | Precision-investment casting method of titanium aluminum base alloy aircraft engine blade |
-
2002
- 2002-10-17 CN CN02133203.7A patent/CN1213824C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102493853A (en) * | 2011-12-12 | 2012-06-13 | 长春工业大学 | Titanium aluminum based powder metallurgy material for automobile engine exhaust doors and manufacturing method of titanium aluminum based powder metallurgy material |
| CN104439042A (en) * | 2014-09-25 | 2015-03-25 | 安徽嘉木橡塑工业有限公司 | Raw materials and process for casting valve seat rings |
| CN104741588A (en) * | 2015-02-14 | 2015-07-01 | 中钢集团邢台机械轧辊有限公司 | Manufacturing method of ICDP roller working layer |
| CN104741588B (en) * | 2015-02-14 | 2016-11-23 | 中钢集团邢台机械轧辊有限公司 | The manufacture method of ICDP roll working lining |
| CN104959571A (en) * | 2015-06-17 | 2015-10-07 | 陈文建 | Titanium alloy forging method |
| CN113637858A (en) * | 2021-07-14 | 2021-11-12 | 上海大学 | TiAl-based alloy based on two-step composite smelting process and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1213824C (en) | 2005-08-10 |
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