CN105537478A - Method for optimizing parameters of GH696 alloy forging technology - Google Patents

Abstract

The invention discloses a method for optimizing parameters of a GH696 alloy forging technology. The method for optimizing the parameters of the GH696 alloy forging technology is used for solving the technical problem that the range of optimizing the parameters of the GH696 alloy forging technology with an existing method is narrow. According to the technical scheme, the value eta of the energy dissipation rate and the plastic flow instability parameter (please see it in the specifications) are calculated based on flow stress and stress data which are obtained through a thermal simulation compression test; an energy dissipation rate curve graph and a plastic flow instability parameter curve graph are established and stacked for constructing a hot working graph, the maximum energy dissipation rate eta1 and the maximum energy dissipation rate eta2 corresponding to the area with the plastic flow instability parameter smaller than or equal to 0 are determined, and the parameters of the GH696 alloy forging technology are optimized with the formula eta2<eta<=eta1 serving as the judgment basis; and the forged microstructure is checked. According to the method for the optimizing parameters of the GH696 alloy forging technology, the plastic flow instability parameter is introduced into the technology, the formula eta2<eta<=eta1 serves as the judging basis, and therefore the reasonable parameter range of the forging technology of GH696 alloy can be optimized, and the application range is wider.

Description

GH696 alloy forging process parameter optimizing method

Technical field

The invention belongs to high-temperature alloy forging molding field, particularly a kind of GH696 alloy forging process parameter optimizing method.

Background technology

The age-hardening type high temperature alloy of GH696 alloy to be a kind of with Fe-Ni-Cr be base, at high temperature there is the combination properties such as higher surrender, lasting, creep strength and good anti-oxidant, anticorrosive, antifatigue, be usually used in manufacturing the key members such as aero-engine turbine disk, turbine outer ring, compressor rotor blade.But the alloying of GH696 alloy is complicated, poor thermal conductivity, and process plastic is low, and when forging and molding, resistance of deformation is large, and forging temperature interval is narrow, forming difficulty.If smithing technological parameter is selected and controlled improper, forging inside easily forms the defects such as forge crack, grain size be uneven, cannot meet instructions for use.Optimize and select rational smithing technological parameter to be the prerequisite obtaining the GH696 forging met the demands.

" Cai great Yong .GH169 and the basic research of GH969 high temperature alloy heat processing technique. Qinhuangdao: University On The Mountain Of Swallows Ph.D. Dissertation; 2003 " disclose a kind of system of selection of GH696 alloy pyroplastic deformation technological parameter, the flow stress strain data that the method obtains based on hot simulation compression test, calculate energy absorbing device, depict the energy absorbing device isogram of GH696 alloy under different distortion temperature and strain rate, obtain the processing parameters that energy absorbing device maximum is corresponding.The method is only decision condition to the maximum with energy absorbing device, and optimize a certain best processing parameters, preferred smithing technological parameter extremely limits to, fail optimization GH696 alloy forging be shaped time rational processing parameters scope.

Summary of the invention

Optimizing the deficiency of GH696 alloy forging narrow ranges of process parameters in order to overcome existing method, the invention provides a kind of GH696 alloy forging process parameter optimizing method.The method tests the flow stress and strain data that obtain based on hot simulation compression, calculate energy absorbing device rate η value and Plastic Flow unstability parameter value; Set up energy absorbing device curve map and Plastic Flow unstability parametric plot respectively, and the two superposition is built hot working chart, determine ceiling capacity dissipative shock wave η ₁with the ceiling capacity dissipative shock wave η that region is corresponding ₂, with η ₂< η≤η ₁as judgment basis, optimize GH696 alloy forging technological parameter; Microstructure after inspection forging.The inventive method is passed through to introduce Plastic Flow unstability parameter, with η ₂< η≤η ₁as judgment basis, can the rational smithing technological parameter scope of optimization GH696 alloy, the scope of application is more extensive.

The technical solution adopted for the present invention to solve the technical problems: a kind of GH696 alloy forging process parameter optimizing method, is characterized in comprising the following steps:

A () is 880 DEG C ~ 1120 DEG C at deformation temperature range, strain rate scope is 0.01s ^-1~ 10s ^-1deformation condition under, respectively hot simulation compression test is carried out to GH696 alloy, flow stress σ when obtaining the plastic deformation of GH696 alloy high-temp and strain stress data;

B flow stress that () obtains according to step (a) and strain data, calculate the strain rate sensitivity m under each deformation temperature and strain rate respectively, then calculate energy absorbing device η value and Plastic Flow unstability parameter value;

C () is by the energy absorbing device η value that obtains in step (b) and Plastic Flow unstability parameter value draws out energy absorbing device curve map and Plastic Flow unstability parametric plot respectively as the function of deformation temperature and strain rate;

D two curve map superpositions that step (c) obtains by (), construct the hot working chart during distortion of GH696 alloy high-temp;

E hot working chart that () sets up according to step (d), ceiling capacity dissipative shock wave value η when determining GH696 alloy high-temp plastic deformation under whole processing parameters ₁and Plastic Flow unstability parameter ceiling capacity dissipative shock wave value η corresponding to region ₂, with η ₂< η≤η ₁as judgment basis, the technological parameter corresponding to it is the GH696 alloy forging processing parameters scope after optimizing;

F (), according to the technological parameter after step (e) optimization, forges GH696 alloy, whether the microstructure detected after forging meets the demands.

The invention has the beneficial effects as follows: the method tests the flow stress and strain data that obtain based on hot simulation compression, calculate energy absorbing device rate η value and Plastic Flow unstability parameter value; Set up energy absorbing device curve map and Plastic Flow unstability parametric plot respectively, and the two superposition is built hot working chart, determine ceiling capacity dissipative shock wave η ₁with the ceiling capacity dissipative shock wave η that region is corresponding ₂, with η ₂< η≤η ₁as judgment basis, optimize GH696 alloy forging technological parameter; Microstructure after inspection forging.The inventive method is passed through to introduce Plastic Flow unstability parameter, with η ₂< η≤η ₁as judgment basis, can the rational smithing technological parameter scope of optimization GH696 alloy, the scope of application is more extensive.

Below in conjunction with the drawings and specific embodiments, the present invention is elaborated.

Accompanying drawing explanation

Fig. 1 is the energy absorbing device curve map of the inventive method strain when being 0.65.

Fig. 2 is the Plastic Flow unstability parametric plot of the inventive method strain when being 0.65.

Fig. 3 is the hot working chart of the inventive method strain when being 0.65, and dash area is the region that Plastic Flow unstability parameter is less than 0, and dotted line is ceiling capacity dissipative shock wave corresponding to this region.

Fig. 4 is 1060 DEG C in deformation temperature, and strain rate is 0.01s ^-1, maximum strain amount is the GH696 alloy microstructure photo under 0.65 condition after forging.

Fig. 5 is 1090 DEG C in deformation temperature, and strain rate is 0.01s ^-1, maximum strain amount is the GH696 alloy microstructure photo under 0.65 condition after forging.

Detailed description of the invention

With reference to Fig. 1-5.GH696 alloy forging process parameter optimizing method concrete steps of the present invention are as follows:

Deformation temperature is selected to be 880 DEG C, 910 DEG C, 940 DEG C, 970 DEG C, 1000 DEG C, 1030 DEG C, 1060 DEG C, 1090 DEG C, 1120 DEG C, strain rate for 0.01s ^-1, 0.1s ^-1, 1.0s ^-1, 10s ^-1, carry out hot simulation compression test to GH696 alloy cylindrical specimens respectively, maximum distortion degree is 50%, flow stress σ when obtaining the plastic deformation of GH696 alloy high-temp and strain stress data.

Flow stress σ when selecting strain to be 0.65 and strain stress data, calculate the strain rate sensitivity m under different distortion temperature and strain rate, then calculate energy absorbing device η value and Plastic Flow unstability parameter respectively value; Then the energy absorbing device curve map (Fig. 1) when the strain of drafting GH696 alloy is 0.65 and Plastic Flow unstability parametric plot (Fig. 2); Energy absorbing device curve map (Fig. 1) and Plastic Flow unstability parametric plot (Fig. 2) are superposed, obtains the hot working chart (Fig. 3) of GH696 alloy strain when being 0.65.In Fig. 3, the maximum of energy absorbing device is 0.53, and the energy absorbing device maximum corresponding to dash area is 0.31.Thus, when strain is 0.65, the foundation optimizing GH696 alloy forging technological parameter is 0.31< η≤0.53, and the processing parameters scope corresponding to it is as shown in table 1.

GH696 alloy rational smithing technological parameter when table 1 strain is 0.65

Deformation temperature/DEG C	Strain rate/s -1
		880	0.01～0.02
910	0.01～0.03
		940	0.01～0.06
970	0.01～0.13
		1000	0.01～0.36
1030	0.01～0.71
		1060	0.01～0.86
1090	0.01～1.35
		1120	0.01～2.18

Strain rate is 0.01s ^-1, when maximum strain amount is 0.65, under forging temperature is 1060 DEG C and 1090 DEG C of conditions, GH696 alloy is forged respectively, then detects the microstructure (Fig. 4 and Fig. 5) after forging.Grain size distribution in microstructure in Fig. 4 and Fig. 5 is comparatively even, without microdefect, meets forging organizational requirements.

A () is 880 DEG C ~ 1120 DEG C at deformation temperature range, strain rate scope is 0.01s ^-1~ 10s ^-1deformation condition under, respectively hot simulation compression test is carried out to GH696 alloy, flow stress σ when obtaining the plastic deformation of GH696 alloy high-temp and strain stress data;

B flow stress that () obtains according to step (a) and strain data, calculate the strain rate sensitivity m under each deformation temperature and strain rate respectively, then calculate energy absorbing device η value and Plastic Flow unstability parameter value;

C () is by the energy absorbing device η value that obtains in step (b) and Plastic Flow unstability parameter value draws out energy absorbing device curve map and Plastic Flow unstability parametric plot respectively as the function of deformation temperature and strain rate;

D two curve map superpositions that step (c) obtains by (), construct the hot working chart during distortion of GH696 alloy high-temp;

E hot working chart that () sets up according to step (d), ceiling capacity dissipative shock wave value η when determining GH696 alloy high-temp plastic deformation under whole processing parameters ₁and Plastic Flow unstability parameter ceiling capacity dissipative shock wave value η corresponding to region ₂, with η ₂< η≤η ₁as judgment basis, the technological parameter corresponding to it is the GH696 alloy forging processing parameters scope after optimizing;

F (), according to the technological parameter after step (e) optimization, forges GH696 alloy, whether the microstructure detected after forging meets the demands.

Claims (1)

1. a GH696 alloy forging process parameter optimizing method, is characterized in that comprising the following steps:

A () is 880 DEG C ~ 1120 DEG C at deformation temperature range, strain rate scope is 0.01s ^-1~ 10s ^-1deformation condition under, respectively hot simulation compression test is carried out to GH696 alloy, flow stress σ when obtaining the plastic deformation of GH696 alloy high-temp and strain stress data;

B flow stress that () obtains according to step (a) and strain data, calculate the strain rate sensitivity m under each deformation temperature and strain rate respectively, then calculate energy absorbing device η value and Plastic Flow unstability parameter value;

C () is by the energy absorbing device η value that obtains in step (b) and Plastic Flow unstability parameter value draws out energy absorbing device curve map and Plastic Flow unstability parametric plot respectively as the function of deformation temperature and strain rate;

D two curve map superpositions that step (c) obtains by (), construct the hot working chart during distortion of GH696 alloy high-temp;

E hot working chart that () sets up according to step (d), ceiling capacity dissipative shock wave value η when determining GH696 alloy high-temp plastic deformation under whole processing parameters ₁and Plastic Flow unstability parameter ceiling capacity dissipative shock wave value η corresponding to region ₂, with η ₂< η≤η ₁as judgment basis, the technological parameter corresponding to it is the GH696 alloy forging processing parameters scope after optimizing;

F (), according to the technological parameter after step (e) optimization, forges GH696 alloy, whether the microstructure detected after forging meets the demands.