CN101418420A

CN101418420A - GH2674 alloy

Info

Publication number: CN101418420A
Application number: CNA2007101576507A
Authority: CN
Inventors: 宋金贵; 崔荣繁; 李殿国; 崔树森; 史凤岭; 方波; 马天军
Original assignee: Shenyang Liming Aero Engine Group Co Ltd
Current assignee: Shenyang Liming Aero Engine Group Co Ltd
Priority date: 2007-10-24
Filing date: 2007-10-24
Publication date: 2009-04-29

Abstract

The invention relates to a GH2674 alloy, which compirses the following compositions in weight percentage: less than or equal to 0.08 percent of C, less than or equal to 0.7 percent of Si, 1.2 to 1.7 percent of Mn, 14 to 16 percent of Cr, 24 to 26 percent of Ni, 1.1 to 1.6 percent of Mo, less than or equal to 0.3 percent of Al, 1.9 to 2.4 percent of Ti, less than or equal to 0.01 percent of B, 0.2 to 0.4 percent of V, less than or equal to 0.01 percent of Ce, less than or equal to 0.1 percent of Zr, and the balance being other components. The GH2674 alloy has good structural stability, good oxidation resistance and corrosion resistance, is applicable to various disks, ring pieces, welding assembling parts and the like of which the motors for aviation, aerospace and the like work at an operating temperature lower than 600 DEG C, and has a very broad and good application prospect, great economic and great national defense values.

Description

The GH2674 alloy

Technical field:

The present invention relates to Materials science, GH2674 is provided alloy especially.

Background technology:

In the prior art, internal combustion turbine has plurality of advantages such as thermo-efficiency height, startup of unit is fast, environmental pollution is little, and therefore heavy (high-power) internal combustion turbine and steam turbine cogeneration have become the first-selection of current large-scale firepower power station.Heavy duty gas turbine also is simultaneously the important device of large ship power or isolated area generating.In addition, overcritical and ultra supercritical steam turbine also will progressively replace traditional steam turbine owing to have higher thermo-efficiency, become one of basic fundamental of large-size thermal power plant from now on.Owing to use long-time running under inferior fuel and the sea salt corrosive environment, therefore industrial combustion machine material removes the high strength at high temperature of general requirement and is outside one's consideration, also requiring has-and fixed corrosion and heat resistant ability and long-term structure stability.

Therefore, people expect to obtain a kind of novel material that can satisfy service requirements.

Summary of the invention:

The purpose of this invention is to provide a kind of novel industry combustion machine material---GH2674 alloy.

GH2674 alloy of the present invention is characterized in that: its moiety and weight percentage content are as follows:

C≤0.08, Si≤0.7, Mn:1.2～1.7, Cr:14～16, Ni:24～26, Mo:1.1～1.6, Al≤0.3, Ti:1.9～2.4, B≤0.01, V:0.2～0.4, Ce≤0.01, Zr :≤0.1, other: surplus.

Above-mentioned " other " concrete preferred content can be: P≤0.02, S≤0.015, Fe: surplus.

It is one of following two kinds that the smelting technology of described GH2674 alloy is specially: adopt electric arc furnace smelting to add the electroslag remelting processing and smelt; Adopting vacuum induction to add the electroslag remelting processing smelts.

The plastic deformation process of described GH2674 alloy is specially: hot-forming temperature is 950～1150 ℃.The plastic deformation process preferred content of described GH2674 alloy is specially: hot-forming temperature is 1020～1080 ℃, and rate of deformation is greater than 0.1s ^-1Test shows: the GH2674 alloy has good working plasticity when being lower than 1150 ℃, be higher than this temperature, the hot-workability rapid deterioration of alloy.Present grain-size of the organizer of thermo compression sample and recrystallize mark two aspects.The main temperature influence of recrystallize mark; The main strained speed influence of grain-size.

In the plastic deformation process of described GH2674 alloy, when the peak stress of GH2674 alloy is studied, adopt the Zener-Hollomon parametric regression to obtain peak stress to be about the relational expression of temperature and strain rate:

σ_{p} = 23.139 \ln \dot{ϵ} + 9.58 \times 105 \times (\frac{1}{T}) - 538.12

This relational expression shows: adopt the deformation technique of high temperature/low strain rate can effectively reduce the maximum distortion drag in the initial deformation stage, thereby under equipment deformability condition of limited, adopt high temperature/low strain rate distortion to help the deformability of the equipment of bringing into play.

Described GH2674 heat treatment of alloy system is specially: 980 ℃ * 2h of solid solution, oil cooling; 720 ℃ * 16h of timeliness, air cooling.

GH2674 alloy of the present invention be a kind of be that base is formed stable austenitic matrix with Fe-Ni, the iron-based wrought superalloy of strengthening mutually with intermetallic compound γ '.Be applicable to the welding component parts of working below 600 ℃ etc., concrete part sees Table 1.Approaching with the A286 alloy of China GH2132 and the U.S., three kinds of alloy component range see Table 2.But its composition range is narrower than GH2132 and A286, and Ti, Mo content slightly improve, and impurity element requires tighter, has particularly added more grain-boundary strengthening Elements C e, Zr etc.Being increased in when improving alloy property of these elements also increased the production difficulty of alloy.

GH2674 alloy port test material system adopts vacuum induction to add the smelting of electroslag remelting processing and forms; The GH2674 alloy that is used to make annular element and diskware adopts electric arc furnace smelting to add the electroslag remelting processing to smelt.Two kinds of smelting technologyes all can obtain the good GH2674 alloy of over-all properties, are used for the excellent base that heavy forging production needs big ingot shape, can consider to select electric arc furnace smelting to add the smelting of electroslag remelting processing from producing in batches.

Following table 1 has been listed the primary member of making the RO110 internal combustion turbine with the GH2674 alloy.In the table 2 three kinds of close alloys are carried out the composition contrast.

Table 1 GH2674 alloy is at the primary member of R0110 internal combustion turbine

Rank	Material	Accessory size mm	Pts wt kg	Shadow area m ²
Rank	Material	Accessory size mm	Pts wt kg	Shadow area m ²	The one-level turbine disk	GH2674	Φ2118×Φ316×160	1500	3.47
The two-stage turbine dish	GH2674	Φ2038×Φ209×163	1400	3.47	The one-level turbine disk	GH2674	Φ2118×Φ316×160	1500	3.47
The two-stage turbine dish	GH2674	Φ2038×Φ209×163	1400	3.47	Three grades of turbine disks	GH2674	Φ1948×Φ180×158	1648	2.93
The level Four turbine disk	GH2674	Φ1848×Φ182×136	1228	2.64	Three grades of turbine disks	GH2674	Φ1948×Φ180×158	1648	2.93
The level Four turbine disk	GH2674	Φ1848×Φ182×136	1228	2.64	Axle journal 15.10057	GH2674	Φ860×Φ194×457
43.10281WD ring	GH2674	Φ1795×Φ1696×199			Axle journal 15.10057	GH2674	Φ860×Φ194×457
43.10281WD ring	GH2674	Φ1795×Φ1696×199			43.10283WD ring	GH2674	Φ1705×Φ1610×219
43.10374WD ring	GH2674	Φ1805×Φ700×122			43.10283WD ring	GH2674	Φ1705×Φ1610×219
43.10374WD ring	GH2674	Φ1805×Φ700×122			43.10375WD ring	GH2674	Φ1849×Φ1724×144
43.10035D ring	GH2674	Φ1611×Φ1509×291			43.10375WD ring	GH2674	Φ1849×Φ1724×144
43.10035D ring	GH2674	Φ1611×Φ1509×291			43.10037WD awl	GH2674	Φ1446×Φ850×241

Three kinds of alloy composition contrasts of table 2 (weight percentage unit: %)

The contents such as composition design, smelting technology, heat processing technique, alloy thermal treatment and tissue that the present invention is directed to the GH2674 alloy have been carried out a large amount of systematic research work, rational alloy formula, smelting technology, heat processing technique and best heat treating regime have been determined, test alloy all round properties (comprising physicals, chemical property, main mechanical property etc.), and carried out the long-term timeliness structure stability research of 2000h.The result shows the GH2674 alloy, better tissues stability is arranged, good anti-oxidant, corrosion resistance have satisfied part trial-production requirement, are applicable to various diskwares that engine operating temperature such as Aeronautics and Astronautics works below 600 ℃, ring, welding component parts etc.; The GH2674 alloy has very wide and good prospects for application.This alloy is that 110,000 kilowatts, life-span are widespread use among 100,000 hours the heavy combustion engine R0110 developing at present power.Used part is the long lifetime part among the R0110; Working temperature height, long parts of life-span such as one～level Four turbine disk wherein, oblique drum barrel, axle journal, front and back extension dish and ring, wherein one～level Four turbine disk diameter reaches about φ 2000mm, is the high maximum temperature alloy diskware that China develops at present voluntarily.The GH2674 alloy reaches international similar alloy advanced level, can guarantee the stable supply of material, satisfies user demand.Simultaneously, this alloy can be promoted and make other like parts, and for China has increased a kind of new superalloy, technical meaning wherein is huge, also brings considerable economic and social benefit simultaneously.This material belongs to material newly developed in China, the needs of combustion machine development and production have not only been satisfied, the high cost that minimizing takes place because of outsourcing, eliminate phenomenon under one's control, but also extend in the manufacturing of part of other analogue, have extremely long-range meaning and huge economy and national defence is worth.

Description of drawings:

Fig. 1 is a GH2674 alloy thermo compression experiment standard;

Fig. 2 is the quick stretching experiment standard of GH2674 alloy.

Embodiment:

Embodiment 1

1) GH2674 alloying constituent control sees table 3.

Table 3 GH2674 alloy process composition (weight percentage, the % of unit)

Element	Cr	Ni	Ti	Mo	Mn	V	P	Al
Element	Cr	Ni	Ti	Mo	Mn	V	P	Al	Standard-required	14-16	24-26	1.9-2.4	1.1-1.6	1.2-1.7	0.2-0.4	≤0.02	≤0.3
Smelt control	15.0	25.0	2.35	1.4	1.55	0.35	0.15	0.30	Standard-required	14-16	24-26	1.9-2.4	1.1-1.6	1.2-1.7	0.2-0.4	≤0.02	≤0.3
Smelt control	15.0	25.0	2.35	1.4	1.55	0.35	0.15	0.30	Female electrode	14.73	25.0	2.32	1.34	1.51	0.39		0.36
Esr 1	15.12	25.28	2.08	1.37	1.49	0.37		0.23	Female electrode	14.73	25.0	2.32	1.34	1.51	0.39		0.36
Esr 1	15.12	25.28	2.08	1.37	1.49	0.37		0.23	Esr 2	15.19	25.15	2.12	1.36	1.49	0.37		0.24

Continuous table 3 GH2674 alloy process composition (weight percentage, the % of unit)

Element	C	Si	Ce	B	Zr	S	Note
Element	C	Si	Ce	B	Zr	S	Note	Standard-required	≤0.08	≤0.7	≤0.01	≤0.01	≤0.1	0.015
Smelt control	0.06		0.01	0.006	0.007			Standard-required	≤0.08	≤0.7	≤0.01	≤0.01	≤0.1	0.015
Smelt control	0.06		0.01	0.006	0.007			Female electrode	0.071				0.0071	0.003
Esr 1	0.072					0.002	2003N-5510	Female electrode	0.071				0.0071	0.003
Esr 1	0.072					0.002	2003N-5510	Esr 2	0.072					0.002	2003N-5803/5804

Illustrate: standard analysis is the composition that requires acquisition behind the esr, and Ti, Mn, V, Al, Ce press upper limit control in the table 3 in the smelting process, and B, Ce, Zr are for calculating add-on, and surplus is mainly Fe.

2) GH2674 alloy smelting technology

GH2674 alloy laboratory port material is smelted the general vacuum induction that adopts and is added the smelting of electroslag remelting processing, and actual production ring rolling spare and disk forge piece adopt one of following two kinds of methods: adopt electric arc furnace smelting to add the electroslag remelting processing and smelt; Adopting vacuum induction to add the electroslag remelting processing smelts.

Description of contents such as laboratory smelting technology route are as follows:

Smelting equipment: VIF-200 vacuum induction furnace

Technological process: vacuumize---send that---------it is static to have a power failure---send that------------------having a power failure,---low power is sent---adding Ce---pours into a mould in high-power stirring to add Mn to fill Ar to add Ti, B-Fe, Ni-Al-Zr to add Al, C in refining to improve power.

Esr: remelting device is the ESR-80 electroslag remelting furnace; Slag system---the melt cinder starting the arc;

Electrical parameter: striking voltage, striking current, fire door voltage, working current;

The GH2674 alloy that is used to make annular element and diskware adopts electric arc furnace smelting to add the electroslag remelting processing to smelt.

The arc furnace smelting procedure simple declaration: the electric arc furnace smelting of GH2674 alloy mother metal is that superalloy is the same with other Fe-Cr-Ni, can adopt the method for directly packing into to smelt.This is because the composition characteristic of alloy determines, the GH2674 alloy contains higher Cr, Ni and is easy to the elements such as Al, Ti of oxidation, if smelt a large amount of scaling loss certainly will cause these alloying elements with oxidation style, the optimal components content range of also restive main strengthening element Al, Ti simultaneously.

Steel ingot goes out furnace annealing then.

Electroslag remelting process:

(1) equipment: 20 tons of protective atmosphere electroslag furnaces; (2) slag system and the quantity of slag: the quantity of slag is about 450kg; Slag system is CaF ₂: Al ₂O ₃=80:20; (3) mode of igniting: Gu slag ignites; (4) parameter: voltage, electric current, molten speed.Steel ingot specification: Φ 900mm * 1850mm/9.8t.This ingot is the superalloy ingot of present domestic maximum, the spindle In Apparent Good Order and Condition.

3) GH2674 alloy plastic deformation technology

Corresponding test---thermo compression tests such as thermo compression and quick stretching in the laboratory, have been carried out

Experimental program is specific as follows:

(1) experiment materials: forge attitude GH2674 alloy; (2) experimental technique: cylinder axis is to compression method; (3) experimental installation: Gleeble-1500 thermal simulation experiment machine; (4) experiment parameter: specimen size, texturing temperature (℃), rate of deformation (s ^-1), the true strain amount; (5) experiment standard: referring to accompanying drawing 1; Experimental result: the straight-line segment of preceding half section rising is true stress-strain curve part in the accompanying drawing 1; In the accompanying drawing 1, back segment straight-line segment or broken line be peak stress-strain part.

GH2674 alloy dynamic recrystallization behavioral study: the metallographicobservation of GH2674 alloy thermo compression sample: the sample after the hot pressing is cut open vertically, observed the microtexture of distorted area, sample center; GH2674 alloy thermo compression sample grain-size: select different visual fields to adopt the Hyen division lines method to measure average grain diameter at random down at LEICA Q500W Quantimet (IA).

Tension test fast: experimental program is as follows:

(1) experiment uses material: GH2674 to forge attitude, and specimen size is φ 8mm * 120mm; (2) experimental technique: bi-directional axial stretches; (3) experimental installation: Gleeble-1500 thermal simulation experiment machine; (4) experiment parameter: texturing temperature (℃), rate of deformation (1/s), deflection; (5) heating schedule: referring to accompanying drawing 2, experimental result: tension fracture elongation and relative reduction in area are mapped the GH2674 alloy plasticity figure that obtains with the variation of temperature rule.

Above-mentioned test shows: the GH2674 alloy has good working plasticity when being lower than 1150 ℃, be higher than this temperature, the hot-workability rapid deterioration of alloy.Present grain-size of the organizer of thermo compression sample and recrystallize mark two aspects.The main temperature influence of recrystallize mark; The main strained speed influence of grain-size.So during thermoforming in the end, the suggestion temperature is about 1050 ℃, adopts the distortion of gross distortion speed, adopts greater than 0.1s under the situation of various conditions permits ^-1Rate of deformation.

4) thermal treatment of GH2674 alloy and tissue, performance study

The main purpose of ageing treatment is that the γ ' phase good order and condition that makes alloy play the main second phase strengthening effect is separated out, and alloy possesses the use properties of hope.This just need to understand alloy in heat treatment process structural transformation and the relation between the alloy structure, performance, could reasonably adjust thermal treatment process according to the different service requirements of alloy.In this test, only different aging temps are studied the alloy Effect on Performance:

Different aging temps are to the alloy Effect on Performance, aging temp is to the influence of alloy room-temperature property, and aging temp is to the influence of alloy rigidity, and aging temp is to the influence of alloy impact property, aging temp is to the influence of alloy enduring quality, and different aging temps are to the influence of alloy structure.

By different aging temps are studied alloy structure, Effect on Performance, finally determined the best heat treating regime of alloy: 980 ℃ * 2h of solid solution, oil cooling; 720 ℃ * 16h of timeliness, air cooling.

Embodiment 2

Present embodiment and embodiment 1 content are basic identical, and its difference mainly is:

1) GH2674 alloy, its moiety and weight percentage content are as follows:

C:0.08, Si:0.7, Mn:1.2, P:0.02, Cr:15, Ni:25, Mo:1.3, Al:0.3, Ti:2.2, B:0.01, V:0.3, Ce:0.01, Zr:0.1, other: surplus.

2) smelting technology of described GH2674 alloy specifically adopts electric arc furnace smelting to add the smelting of electroslag remelting processing.

3) plastic deformation process of described GH2674 alloy is specially: hot-forming temperature is 950 ℃.

Embodiment 3

1) GH2674 alloy, its moiety and weight percentage content are as follows: C:0.06, Si:0.5, Mn:1.4, P:0.01, Cr:14, Ni:26, Mo:1.1, Al:0.05, Ti:2.4, B:0.005, V:0.2, Ce:0.005, Zr:0.07, other: surplus.

2) smelting technology of described GH2674 alloy specifically adopts vacuum induction to add the smelting of electroslag remelting processing.

3) plastic deformation process of described GH2674 alloy is specially: hot-forming temperature is 1150 ℃.

Embodiment 4

1) GH2674 alloy, its moiety and weight percentage content are as follows:

C:0.02, Si:0.3, Mn:1.7, Cr:16, Ni:24, Mo:1.6, Al:0.2, Ti:1.9, B:0.001, V:0.4, Ce:0.002, Zr:0.01, other: surplus.

The plastic deformation process of described GH2674 alloy is specially: hot-forming temperature is 1020 ℃, and rate of deformation is about 0.1s ^-1

Embodiment 5

The plastic deformation process of described GH2674 alloy is specially: hot-forming temperature is 1080 ℃, and rate of deformation is about 0.5s ^-1

Claims

1, GH2674 alloy is characterized in that: its moiety and weight percentage content are as follows:

2, according to the described GH2674 alloy of claim 1, it is characterized in that: the moiety of GH2674 alloy and weight percentage content are:

C≤0.08, Si≤0.7, Mn:1.2～1.7, Cr:14～16, Ni:24～26, Mo:1.1～1.6, Al≤0.3, Ti:1.9～2.4, B≤0.01, V:0.2～0.4, Ce≤0.01, Zr :≤0.1, P≤0.02, S≤0.015, Fe: surplus.

3, according to the described GH2674 alloy of claim 1, it is characterized in that: the smelting technology of described GH2674 alloy is specially one of following two kinds: adopt electric arc furnace smelting to add the electroslag remelting processing and smelt; Adopting vacuum induction to add the electroslag remelting processing smelts.

4, according to the described GH2674 alloy of claim 1, it is characterized in that: the plastic deformation process of described GH2674 alloy is specially: hot-forming temperature is 950～1150 ℃.

5, according to the described GH2674 alloy of claim 4, it is characterized in that: the plastic deformation process of described GH2674 alloy is specially: hot-forming temperature is 1020～1080 ℃, and rate of deformation is greater than 0.1s ^-1

6, according to the described GH2674 alloy of one of claim 1～5, it is characterized in that: described GH2674 heat treatment of alloy system is specially: 980 ℃ * 2h of solid solution, oil cooling; 720 ℃ * 16h of timeliness, air cooling.