CN103540775A - Nickel-molybdenum intermediate alloy preparation method for smelting TA10 cast ingot - Google Patents
Nickel-molybdenum intermediate alloy preparation method for smelting TA10 cast ingot Download PDFInfo
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Abstract
The invention provides a nickel-molybdenum intermediate alloy preparation method for smelting a TA10 cast ingot. The nickel-molybdenum intermediate alloy preparation method comprises the following steps: respectively turning a pure nickel rod and a molybdenum rod into scrap materials, and heating and drying the scrap materials; adding dried master batch nickel scraps into a crucible of a medium-frequency induction furnace; meanwhile, adding molybdenum scraps into a secondary charging hopper in the medium-frequency induction furnace; vacuumizing the medium-frequency induction furnace to 0.6Pa-0.1Pa and starting to heat and smelt; raising the temperature to 1800-1900 DEG C and keeping the heat for 15-20 minutes; observing that when the smelting rate of the master batch nickel scraps is more than 45%, starting to add the molybdenum scraps; inflating argon to carry out gas protection; continually raising the temperature to guarantee that the temperature reaches 1900 DEG C and keeping the temperature for 20-30 minutes to sufficiently float impurities in smelting liquid up to the surface of a smelting tank; and finally, pouring the smelting liquid into a fixed die and cooling to the room temperature to obtain the product. According to the nickel-molybdenum intermediate alloy preparation method, pure nickel and pure molybdenum are directly prepared into an intermediate alloy; the smelting point of the nickel-molybdenum alloy is reduced and various disadvantages of a traditional manner of adding the intermediate alloy in the process of smelting the TA10 cast ingot are made up.
Description
Technical field
The invention belongs to master alloy technical field, be specifically related to a kind of nickel molybdenum master alloy preparation method for melting TA10 ingot casting.
Background technology
Master alloy is as the important additive of a kind of metallurgy industry, and while its role is to melting containing the widely different alloy of fusing point, the master alloy of pre-prepared use is lower than the fusing point of pure element, guarantees to add element molten mutually.In the time of tradition melting TA10 ingot casting, general employing added Ti-32Mo, pure nickel bar or nickel bits, carries out element balance.Make a general survey of whole adding procedure, have following drawback: 1, pure metal element adds, and certainly will have segregation situation, add nickel bar or nickel bits, the density of nickel is larger, can not guarantee its mobility, therefore can cause part or microsegregation, artificial distributing technique be required strict; 2, Ti-32Mo master alloy, prepared by the general consumable electrode vacuum furnace that adopts, because self-consuming furnace temperature rise is certain, Mo self fusing point is high, density is large, very large with titanium sponge fusing point, density variation, therefore melting is very poor in preparation process, segregation degree well imagines, higher containing Mo amount because of self again, follow-up amount of adding as TA10 master alloy is few, even so control during cloth evenly again, also cannot avoid microsegregation.Aforesaid method distributing technique difficulty is large, due to twice interpolation of needs, could meet alloying constituent requirement, therefore operator's sense of responsibility, people's engine efficiency etc. is all had higher requirement, is therefore necessary to improve.
Summary of the invention
The technical problem that the present invention solves: a kind of nickel molybdenum master alloy preparation method for melting TA10 ingot casting is provided, pure nickel and pure molybdenum are directly prepared and become master alloy, reduce the fusing point of nickel-molybdenum alloy, all deficiencies of adding master alloy while making up traditional melting TA10 ingot casting.
The technical solution used in the present invention: the nickel molybdenum master alloy preparation method for melting TA10 ingot casting, comprises the steps:
1) pure nickel rod and molybdenum bar are lathed respectively to the bits shape thing that thickness is 1-2mm, then the good bits shape thing of turning are put into respectively to hammer mill and be broken into nickel bits and the molybdenum bits that length is 5-20mm; By nickel bits and molybdenum bits clean, oil removing puts into drying shed after also naturally drying, and heats to 75 ℃, be incubated 12 hours and dry;
2) the masterbatch nickel bits through drying are added in the crucible of medium-frequency induction furnace, molybdenum bits are added to the secondary charging bucket being placed in medium-frequency induction furnace simultaneously;
3) start to add hot smelting when being evacuated to 0.6～0.1Pa in medium-frequency induction furnace;
4) be warming up to 1500 ℃-1700 ℃, insulation 15-20 minute, observes when masterbatch nickel bits melting rate surpasses 45%, start to add molybdenum bits, and be filled with argon gas and carry out gas shield, continuing to heat up guarantees that temperature is at 1900 ℃, insulation 20-30 minute, makes the impurity in liquation fully float up to weld pool surface;
5) solution-cast is entered to cover half, be then cooled to room temperature.
Above-mentioned steps 2) in, described medium-frequency induction furnace adopts serial-resonant medium-frequency induction furnace, its inversion device is IGBT module, and ruhmkorff coil design adopts instead and around technology, the error of the design power of ruhmkorff coil and actual motion power is not more than 5%.
The present invention's advantage compared with prior art:
1, adopt the medium frequency induction melting furnace of serial-resonant (IGBT), its inversion device is a kind of New IGBT module (insulated gate bipolar transistor, Germany produces), it is mainly used in melting general carbon steel, steel alloy, cast steel, non-ferrous metal hard to tolerate etc. relatively.It has, and burn-off rate is fast, energy-conservation, higher harmonic is polluted the advantages such as low.Coil design is in conjunction with the actual service condition of induction furnace, according to electromagnetic field principle, the definite preferred version by the calculating of computer professional software, adopt up-to-date coil anti-and around technology (two induction coils are in parallel), better assemble magnetic field, improve magnetic field whipping force, the error of the design power of ruhmkorff coil and actual motion power is not more than 5%, the insulation of coil, particularly turn-to-turn insulation adopts advanced insulation processing way to guarantee, special-purpose tensioning technique can reduce the axial vibration of coil effectively;
2, nickel-molybdenum alloy is a kind of mechanical mixture alloy, have and do not changing under the prerequisite of original metal lattice and performance, and the feature that fusing point is lower, fusing point is 1380 ℃ of left and right, is more conducive to the utilization of subsequent handling;
3, smelting preparation process determines that nickel-molybdenum alloy uniform ingredients, foreign matter content are lower, adopts vacuum intermediate-frequency stove, and fusion process itself is primary purification process; In alloy preparation process, topmost impurity is the oxide compound of nickel and molybdenum, and follow-up fusion process is difficult to be melted, and mostly is refractory compound and remains among material; The oxide compound NiO of nickel wherein, density is 6.6g/cm
3, fusing point is 1984 ℃, but under vacuum state, 300 ℃ are heated ten minutes, can reduce and become metallic nickel; Two kinds of the oxide compounds of molybdenum are molybdic oxide and molybdenum dioxide, molybdic oxide density 4.692g/cm
3left and right, the density of molybdenum dioxide is 6.44g/cm
3, the two can transform under certain condition mutually, and molybdenum dioxide is refractory compound, but because its density ratio mother alloy density is little, so under continuous function composite by electromagnetic stirring, can follow impurity to float up to molten bath upper surface, adopting thus the melting of vacuum intermediate-frequency stove, itself is exactly primary purification process;
4, Ni-Mo32%(Mo content 32%) composition, once add and just can reach the requirement of theory T A10 Chemical Composition, people's engine efficiency is higher, more convenient, workable;
5, equipment self has variable frequency electromagnetic stirring, and (density of Mo is 10.2g/cm to two kinds of pure metal density
3, the density of Ni is 8.9g/cm
3, Ni-Mo32% alloy density is 9.2g/cm
3) very approaching, cause liquation circulation, melting good, can solve the segregation problem in master alloy preparation process from root;
6,, after melting finishes, specification is carried out turning processing as requested.
Embodiment
Below in conjunction with describing a kind of embodiment of the present invention.
Nickel molybdenum master alloy preparation method for melting TA10 ingot casting, comprises the steps:
1) pure nickel rod and molybdenum bar are lathed respectively to the bits shape thing that thickness is 1-2mm, then the good bits shape thing of turning are put into respectively to hammer mill and be broken into nickel bits and the molybdenum bits that length is 5-20mm; By nickel bits and molybdenum bits clean, oil removing puts into drying shed after also naturally drying, and heats to 75 ℃, be incubated 12 hours and dry; By raw material turning, be that length, thickness are considered shape relatively uniformly to be worth doing, contribute to reduce energy consumption, guarantee that melting, the uniformity coefficient of two kinds of metals in fusion process is better;
2) the masterbatch nickel bits through drying are added in the crucible of medium-frequency induction furnace, molybdenum bits are added to the secondary charging bucket being placed in medium-frequency induction furnace simultaneously; Described medium-frequency induction furnace adopts serial-resonant Medium frequency induction molten, and its inversion device is IGBT module, and ruhmkorff coil design adopts instead and around technology, the error of the design power of ruhmkorff coil and actual motion power is not more than 5%;
3) start to add hot smelting when being evacuated to 0.6～0.1Pa in medium-frequency induction furnace;
4) be warming up to 1500 ℃-1700 ℃, insulation 15-20 minute, observes when masterbatch nickel bits melting rate surpasses 45%, start to add molybdenum bits, and be filled with argon gas and carry out gas shield, continuing to heat up guarantees that temperature reaches 1900 ℃, insulation 20-30 minute, makes the impurity in liquation fully float up to weld pool surface;
5) solution-cast is entered to cover half, be then cooled to room temperature.
The about 50kg of single stove charging capacity, because charging capacity is less, self has variable frequency electromagnetic stirring equipment, two kinds of pure metal density are very approaching, therefore, liquation circulation, melting are good, can solve the segregation problem in master alloy preparation process from root, after melting finishes, specification is carried out turning processing as requested.
Nickel-molybdenum alloy forms angle from alloy, is exactly a kind of simple mechanical mixture.Mechanical mixture is the class complex phase mixture tissue in alloy, and different Xiang Junke is combined to form mutually mechanical mixture.Mechanical mixture can be by forming between pure metal, also can be by forming between pure metal and compound, pure metal and sosoloid, sosoloid and sosoloid and sosoloid and compound.In mechanical mixture, two constituent elements that form alloy can not mutually dissolve under solid-state, can not react each other formation compound again, each still keeps original lattice and performance in mechanical mixture, the performance of mechanical mixture is between the phase performance forming, and industrial most of alloys are by compositions of mixtures, and the fusing point of mechanical mixture is compared with constituent element melting point depression, in preparation process, through approximately 1380 ℃ of the fusing points of measuring and calculating nickel molybdenum master alloy.
Principle of work: utilize the principle of Frequency Induction Heating to melt under vacuum condition, in stove, there is a helix tube type ruhmkorff coil, when ruhmkorff coil is connected electric current of intermediate frequency, produce alternating magnetic field, metallic nickel bits and molybdenum bits induce electromotive force under the effect in magnetic field, produce ring current, due to surface action, (surface action is again skin effect, when exchange current passes through conductor, electric current will concentrate on conductive surface and flow through, this phenomenon is surface action, that curtage is when conduct in conductor with the higher electronics of frequency, can be gathered in total conductor top layer, but not be evenly distributed in the sectional area of whole conductor), make metal outer there is very high current density, thereby produce powerful heat effect, make nickel and molybdenum heating until fusing.Meanwhile, in molten bath, there is the induction stirring of some strength, can promote all even temperature equilibriums of each composition, make the trace impurity in raw material merge, grow up and float.
Routine is prepared alloy and is adopted consumable electrode vacuum furnace (VGA), needs pre-prepared electrode, then electrode is welded to melting.The temperature rise of self-consuming furnace is certain, is about 1700 ℃, and groundwork principle is to utilize high-temperature electric arc to carry out Metal Melting, cannot be incubated and the whole induction stirring operation in molten bath (transverse-electromagnetic that can only carry out among a small circle arc light molten bath part stirs).Pre-prepared electrode difficulty is higher, molybdenum bar and nickel rod need to be tied up, is welded according to theoretical ratio, because molybdenum fusing point exceeds self-consuming furnace temperature rise, can not carry out heat retaining operation again, so certainly will cause that melting is inhomogeneous, segregation, even exist with fusant state not.Need repeatedly melt back, just likely produce a desired effect; Conventionally need three meltings just can reach and melt effect completely, but 3 chemical compositions of upper, middle and lower differ greatly.
For traditional technology, we have adopted vacuum medium frequency induction furnace, evade electrode and prepared difficult technique bottleneck, equipment self temperature rise is higher, raw material specification is controlled, molten bath is whole can carry out induction stirring (hump effect), energy efficient, makes alloying constituent more even to a great extent, and people's engine efficiency is higher, and vacuum intermediate-frequency stove fusion process itself is exactly primary purification process, for providing the chemical composition of strong both macro and micro, follow-up melting guarantees.
Above-described embodiment, is preferred embodiment of the present invention, is not used for limiting the scope of the present invention, and the equivalence of being done with content described in the claims in the present invention therefore all changes, within all should being included in the claims in the present invention scope.
Claims (2)
1. for the nickel molybdenum master alloy preparation method of melting TA10 ingot casting, it is characterized in that comprising the steps:
1) pure nickel rod and molybdenum bar are lathed respectively to the bits shape thing that thickness is 1-2mm, then the good bits shape thing of turning are put into respectively to hammer mill and be broken into nickel bits and the molybdenum bits that length is 5-20mm; By nickel bits and molybdenum bits clean, oil removing puts into drying shed after also naturally drying, and heats to 75 ℃, be incubated 12 hours and dry;
2) the masterbatch nickel bits through drying are added in the crucible of medium-frequency induction furnace, molybdenum bits are added to the secondary charging bucket being placed in medium-frequency induction furnace simultaneously;
3) start to add hot smelting when being evacuated to 0.6～0.1Pa in medium-frequency induction furnace;
4) be warming up to 1800 ℃-1900 ℃, insulation 15-20 minute, observes when masterbatch nickel bits melting rate surpasses 45%, start to add molybdenum bits, and be filled with argon gas and carry out gas shield, continuing to heat up guarantees that temperature is at 1900 ℃, insulation 20-30 minute, makes the impurity in liquation fully float up to weld pool surface;
5) solution-cast is entered to cover half, be then cooled to room temperature.
2. the nickel molybdenum master alloy preparation method for melting TA10 ingot casting according to claim 1, it is characterized in that: above-mentioned steps 2), described medium-frequency induction furnace adopts serial-resonant Medium frequency induction molten, its inversion device is IGBT module, ruhmkorff coil design adopts instead and around technology, the error of the design power of ruhmkorff coil and actual motion power is not more than 5%.
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Cited By (3)
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| CN105483411A (en) * | 2015-12-11 | 2016-04-13 | 西北工业大学 | Nickel-based quinary intermediate alloy containing high-melting point components and preparation method thereof |
| CN107739891A (en) * | 2017-10-20 | 2018-02-27 | 宝钛集团有限公司 | A kind of preparation method of nickel molybdenum intermediate alloy |
| CN108754200A (en) * | 2018-08-28 | 2018-11-06 | 马林生 | A kind of nickel molybdenum intermediate alloy preparation process |
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Cited By (5)
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| CN107739891A (en) * | 2017-10-20 | 2018-02-27 | 宝钛集团有限公司 | A kind of preparation method of nickel molybdenum intermediate alloy |
| CN107739891B (en) * | 2017-10-20 | 2019-11-12 | 宝钛集团有限公司 | A kind of nickel molybdenum intermediate alloy is preparing the application in ErNiCrMo-3 alloy |
| CN108754200A (en) * | 2018-08-28 | 2018-11-06 | 马林生 | A kind of nickel molybdenum intermediate alloy preparation process |
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