Method for production of rolled ring blanks from high-alloy nickel alloys

FIELD: technological processes.

SUBSTANCE: initial ring blank is produced with rectangular section. Specified cut length bar is thermally insulated by means of adhesion of two or three layers of asbestos cloth on its end and side surfaces and drying. Then heat-insulated bar is placed in furnace and is heated for upset. Upset is carried out in press with application of thermostat rings. Upset bar is pierced, after that it is paned or turned. Prepared initial ring blank is exposed to hot rolling. Then rolled blank is calibrated and thermally processed.

EFFECT: higher quality of prepared blanks due to elimination of crack formation during upset.

2 cl, 5 dwg

 

The invention relates to a pressure treatment of metals, in particular, to methods for producing a ring blanks for parts of gas turbine engines (GTE), and may find application in industries, which manufactured various annular (or circular, for example, disks) articles of aging Nickel alloys, especially high-alloy, characterized by limited ductility at stamping operations (in particular at upsetting press).

The known method deformation by forging (upsetting, punching) billets of high-alloy aging of Nickel alloys using the insulating them from deforming tooling (tool) by a random coatings [1, s, 300]. However, despite the positive effect of such insulation in welding workpieces of these materials formed the cracks, including rough, great length, both end surfaces and on the side (barrel) [1, ri]. This is due primarily to the fact that regardless of even the insulation of end surfaces of the intense heat from the side (at first cylindrical, then barrel-shaped) surface. At the same time, due to the redistribution of heat in the workpiece is podstugivaniya and insulated from the tooling surfaces. Therefore, in tomslake, when the deformable alloy has a narrow interval homogeneous state (the heating temperature under draught to the temperature of the beginning of the collapse), there is a sharp decrease in ductility (embrittlement) of the metal due to local collapse of the aging of the alloy mainly at the grain boundaries in the deformation process and, as a consequence, cracks [2, 3].

The known method precipitation blanks of high Nickel alloys in presses in which to reduce heat loss between the plates and the workpiece using pads (pads) of the cheap material heated in the furnace together with the workpiece or strip of heat-resistant alloys (as deforming tool), heated to 800...900° [1, s].

The disadvantage of this method is a significant complication of the precipitation process, the difficulty of obtaining the specified dimensions for each transition precipitation, increased consumption of auxiliary materials (gaskets) for each workpiece, the impossibility of providing a full guarantee to prevent cracking.

A known method of manufacture of annular workpieces made of heat-resistant Nickel alloys, including the original manufacturer of the rings-billet of rectangular cross-section through precipitation rod length with subsequent firmware and justify (or groove), as well as warm and hot rollers with p the following heat treatment [4].

The disadvantage of this method is that in case of using such high alloy steels, such as HEY 698 VD (≈25% γ'-phase), at upsetting rod length cracks of the type described in [1, ri], and alloys of type EP 742 VD (≈35% γ'-phase) or EC 79 VD (≈45% γ'-phase) this technology is generally unacceptable. The use of insulation type of asbestos cloth or mullite-siliceous mineral wool (as in method [1]) improves the situation but does not fully prevent cracking even in alloys with a number of γ'-phase up to 25% (HEY 698 VD). Therefore, operation rainfall has performed in several transitions with the deformation in each transition of the order of 20...30% or less. But in most cases this does not guarantee prevention of cracking.

In particular, upsetting the workpieces of alloy HEY 698 VD is produced after heating at 1160 1180...°with the end of the deformation at temperatures below 1000° [5]. The temperature of complete dissolution γ'-phase during heating and the beginning of its separation when cooled in this alloy ≈1030°C. Podstugivaniya the surface of the workpieces to ˜1000°and below in the process of transporting them from the furnace to the press, installed on the bottom plate, the supply of the upper plate and especially in the deformation process leads to the beginning of an intensive decay with a sharp decrease in ductility is, as a result, cracking type [1, ri]. Depending on the massiveness (more massive billet slower podstegivayut) from values of the aspect ratio (section height and diameter of the workpiece), on the accuracy of wrapping a heat insulator (from seal it to the workpiece), and from the tendency of aging of the alloy to intense disruption (which in the first approximation increases with the increase of the possible total number of γ'-phase in this alloy, quantity, size and area localization of cracks (or on the end surfaces or barrel-shaped surface, or in both places at the same time) can vary within a wide range (figure 1).

A known method of manufacturing a rolled ring preparations of high Nickel alloys [6], including the original manufacturer of the rings-billet of rectangular cross-section through precipitation rod length using thermal insulation of the end surfaces of the upper and lower press plates with subsequent firmware and justify, or groove, as well as warm or hot rolling followed by heat treatment, in which the source rod length, insulated on the ends of the top and bottom layers of the ceramic insulator (mullite-siliceous wool or asmodai), the plate press before the draft is placed inside the ring-thermos is ATA from any carbon steel, heated in the same cage with rod length and installed on insulated plate press immediately before the issuance of the rod length on draught, and a ring-thermostat has a height of 3...5 mm less than the height of the upset of the rod length, inner diameter, 50...100 mm greater than the outer diameter of the upset of the rod length, and wall thickness in the radial direction is not less than 100 mm (if necessary, sludge is produced in several passages; in this case, the cylindrical surface of the original piece at all transitions starting from the second, turns into a barrel) [prototype].

The disadvantage of this method, in particular with regard to procurement in gripping device boot manipulator adjacent to the furnace cover with two layers of mullite-siliceous wool) is accompanied by intensive decay and, as a consequence, the crack growth. This is aggravated by the fact that in the zones of contact with the metal jaws of a gripping device boot manipulator billet podstegivayut stronger and faster than all the rest of the surface, resulting in cracks in these zones are formed even before the start of precipitation, and the precipitation they are very open, forming deep "Zev" (internal surface cracks of a dark, oxidized, because it formed the ri high temperature) (figure 2).

The technical result of the invention is the provision of comprehensive (on all surfaces and in the right areas) reinforced insulation to minimise heat loss in welding rods of standard length and, consequently, prevent cracking, especially in the case of aging of Nickel alloys with a number of γ'-phase over 25%.

This technical result is achieved by the fact that the original rod length before planting in the oven to heat under draught glued the ends and on the side surface of two or three layers of asbestos cloth and dry with lateral layers with the ends joined by folding (not butt). In the subsequent drying layered asbestos shell hardens and becomes a kind of capsule. It is important to bear in mind that careless touch this shell in the contact zone may break (it's relatively loose), resulting sponge gripping device can enter into direct contact with the workpiece and, as a consequence, again, you receive the chance of cracking.

All other activities are conducted in accordance with the method of the prototype.

Comparative analysis of the claimed solution with the prototype shows that the new method differs from the known fact that the original procurement rebuff in conditions of maximum sun the third insulation (on both end surfaces, on the lateral surface and in the corner areas). For aged Nickel alloys in conditions of deformation (especially alloys, with the number γ'-phase over 25%) it is very important to minimize the degree of supercooling of deformable blanks: the subcooling less, the less the degree of decomposition of the supersaturated solid solution in the given conditions, and the less likelihood of cracking. Only careful reinforced insulation in multiple layers of asbestos cloth by gluing in combination with rings-thermostats allows to approximate the conditions of deformation of the intermediate isothermal. From this it follows that the proposed method compared to the method prototype has distinctive features.

Known technical solution [6] (prototype), in which the draught bar length produced in the ring-thermostats with the use of insulation, and the heat insulator in the form of two layers of mullite-siliceous wool or asbestos fabric being coated with a on the bottom plate before issuing it from the oven these rods and rings thermostats and being coated with a top to them in the form of two layers of mullite-siliceous wool (here asbestos cloth unacceptable due to the fact that it is due to their relative stiffness does not provide the necessary seal and wrapping) and partly from the sides completely side surface cannot wrap because that hinder adjacent to the harvesting of sponges grasp the boot of the manipulator; the bottom end of the workpiece in the process of being moved from the furnace to the press, too, is without insulation). Thus, the prototype rod length (procurement) during shipment from the furnace to the press (mainly in the time interval of from several tens of seconds to minutes) from the lower end and on 30...40% side surface has no insulating coating. Moreover, the side surface of her at this time is in contact with the metal jaws of a gripping device boot manipulator that causes podstugivaniya contact zones and local collapse intensivecare alloys and as a result, cracking in these areas. It is important to bear in mind that these nuances insulation is crucial only for intensivstation Nickel alloys with a large number of γ'-phase (over 25%) are alloys of type EP ID (35% γ'-phase), EK ID (45% γ'-phase) and other alloys with a number of γ'-phase is not more than 25% (e.g., HEY 698 VD) prototype method quite effectively ensures the prevention of crack formation in welding. For workpieces of alloy type EP ID and EK IN sludge without taking into account the above nuances of insulation (i.e. the prototype method is virtually Tvrtko leads to crack formation. These differences indicate the novelty of the proposed solution.

The proposed method was tested on alloys with different amounts γ'-phase: HEY 698 VD (≈25% γ'-phase); EP ID (≈35% γ'-phase) and EK IN (≈45% γ'-phase). With respect to alloy HEY 698 VD method gives almost 100% positive result. In the case of alloys EP ID (ε≈ up to 50%) and EC ID (ε≈20...30%) is of great importance to the accuracy and thoroughness of insulation in the form of "asbestos capsules", transporting workpieces from the furnace to become and execution of the operation rainfall.

The invention is illustrated in the photos. Figure 1 shows the upset billet alloy EI 698 VD with a large number of cracks on the barrel side surface and at the ends (their pictures are not visible). Sludge produced without rings thermostats and without insulation.

Figure 2 shows the upset billet alloy EK ID: a - side view (with crack); b - end view. Sludge was carried out in accordance with the invention. However, when withdrawing the workpiece from the furnace because of careless movement of the arm on the side was torn out part of the "asbestos capsules". One of the jaws grasp the boot of the manipulator during transportation from the furnace to the press in contact directly with the workpiece. Crack is formed to precipitation. In the precipitation process in the tensile stresses on the barrel surface, the crack widened and deepened. On figa shows one of the biggest cracks formed under these conditions. Usually they are significantly smaller (figure 3: a - General view; b - enlarged x4).

Figure 4 shows a successfully transplanted in accordance with the invention, the billet of the alloy EK ID: - deformation ε=24...27%; b - deformation ε=23...24% (source height, figa and figb was different for different ciphers rings).

Figure 5 shows the successfully transplanted in accordance with the invention, the billet of alloy EP ID (ε=25%): a - lateral view; b - end view.

Thus, the new method allows defect-free draught pieces of alloys of the type EP ED to ε≈50% and type EK ED to ε≈20...30% for one transition. Macro - and microstructure, and mechanical properties of ring blanks, made in a new way, meet the requirements of the SPECIFICATIONS.

Sources of information

1. Dzugutov MY Plastic deformation of high-alloyed steels and alloys. - M.: metallurgy, 1971, 424 S.

2. Vaulin SHOSTAKOVICH, Eremenko V., Vlasova OLGA. and other Technological features of manufacturing of forged semi-finished products made of heat-resistant Nickel alloys. - In the book: "Advanced technologies of light and special alloys" / 100-l is party birthday of academician Afellow - M.: PHYS-LIT, 2006-432 S., s-301.

3. Ryabikin NM, Protsiv J.V. Preventing crack formation in the manufacture of allocating ring preparations of high Nickel alloys - ibid, s.285-293.

4. Production of ring blanks. Zubkov A. I., Lebedev V.N., Aref, VA and others - M.: Central research Institute of information, 1980, 284 S.

5. Malenkov D.B Heat-resistant steels and alloys. The Handbook. - M.: metallurgy, 1983, 192 S.

6. RF patent №2198760. A method of manufacturing a rolled ring preparations of high Nickel alloys (Ryabikin NM, Protsiv J.V.).

1. A method of manufacturing a rolled ring preparations of high Nickel alloys, including obtaining initial ring blanks with a rectangular cross-section by heating under draft rod length in the furnace, insulation, precipitation in the press using rings thermostats, future firmware and acceleration or turning, as well as warm or hot rollers received the original ring blanks and subsequent calibration and heat treatment, characterized in that the insulation rod length is carried out before landing in the oven to heat under draft by obkleivanie its end and side surfaces of two or three layers of asbestos cloth and drying.

2. The method according to claim 1, characterized in that use the measuring rod length is s of the most rapidly aging alloyed Nickel alloys with a number of γ '-phase, exceeding 25%.



 

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