CN106563753A - Forging method of high-temperature alloy turbine moving blade - Google Patents

Abstract

The invention belongs to the technical field of forging and relates to a forging method of a high-temperature alloy turbine moving blade. GH4033 serves as a raw material, the smelting process is vacuum induction melting and vacuum self-consumable remelting, the selected acceptance standard is GJB1953A-2008, the grain size is not larger than grade 3 specified by GB/T6394, then blank forging is conducted, the reasonable deformation speed and amount are selected during forging, and then thermal treatment and physical and chemical testing are conducted. The method can ensure the situation that qualified low-power flow lines and grains with the high grain size being above grade 3 can be obtained, and the percent of pass in batches is improved.

Description

A kind of forging method of superalloy turbine movable vane piece

Technical field

The invention belongs to technical field of forging, is related to a kind of forging side of superalloy turbine movable vane piece Method.

Background technology

The forging of superalloy turbine movable vane piece to go up at home that be belonging to always technology content higher Hi-tech Manufacturing field, because turbine rotor blade is complex-shaped, Curvature varying is larger, Work under bad environment, discontinuity, superalloy turbine movable vane sheet material does not require nothing more than tool There is higher comprehensive mechanical property, also require that low power streamline is uniformly distributed, macroscopic coarse grain should expire The requirement of table 3 in sufficient HB/Z91-85, superalloy turbine movable vane piece inner alloy it is average Grain size is not coarser than 3 grades of GB/T6394 regulations, due to spy of the turbine moving blade to grain size It is different to require, therefore, there is larger difficulty, superalloy turbine during forging molding The macroscopic coarse grain and high power coarse-grain problem of movable vane piece is uncontrollable always, in actual production process In easily produce macroscopic coarse grain problem and high power coarse-grain problem, longitudinal low power streamline occurs serious Coarse region, crystal grain major axis dimension more than 3mm, as described in Figure 1.

High power metallographic (100 ×), coarse grain zone metallographic as described in accompanying drawing 2, blade high power coarse-grain, Grain size reaches 0 grade, frequently results in batch and scraps.

The content of the invention

Present invention solves the technical problem that：Guarantee the flat of superalloy turbine movable vane piece inner alloy Grain size is not coarser than 3 grades of GB/T6394 regulations, and low power crystal grain meets table 3 in HB/Z91-85 Requirement, and each several part shape of superalloy turbine movable vane piece can be according in forging process The flowing law molding of forging metal, blade longitudinal direction low power streamline is distributed along cross-sectional shape, does not have , there is no crackle, loose, hole, be mingled with and the metallurgical imperfection such as segregation in percolation and serious vortex.

Technical scheme is comprised the steps of：

Step one：

Materials procurement：Raw material GH4033, specification Φ 65, smelting process：Vacuum induction melting Plus vacuum consumable remelting, acceptance criteria GJB1953A-2008, grain size be not coarser than GB/T6394 rule Fixed 3 grades.

Step 2：

Forging is waste：Analysis forging drawing, the shape, size and technical requirements and raw material according to forging Specifications design famine type structure.

Step 3：

Die forging：Forging equipment uses 3 tons of die hammers, selects deformation velocity and deflection, wherein head Under-voltage amount >=7mm after fire, head fire hammer number >=7 time, the deflection for hammering every time is less than 15%, And the time interval for hammering every time 3 seconds～5 seconds, cooling after forged mode is air cooling, two fiery die forgings Hammer number >=5 time, every time the deflection of hammering is less than 10%, and the time interval for hammering every time 3 seconds～5 seconds, cooling after forged mode was air cooling.

Step 4：

Heat treatment：Batching is by same piece number, the same material trade mark, same hearth number, same rule Lattice and same heat treatment heat are constituted.

Step 5：

Physico-chemical tests：Longitudinal macrostructure, high power metallographic structure, mechanics properties testing.

Beneficial effects of the present invention：Forging method of the present invention, by controlling superalloy turbine movable vane Piece famine type and die forging deformation velocity and deflection, it is ensured that obtain more than 3 grades high power grain size with And qualified low power streamline and crystal grain, batch qualification rate is improved, with higher using value.

Description of the drawings

Fig. 1 is the macroscopic coarse grain state of traditional method forging；

Fig. 2 is the high power coarse-grain state of traditional method forging；

Fig. 3 is waste type structure chart；

Fig. 4 is the macrostructure state of the inventive method forging；

Fig. 5 is the mirco structure state of the inventive method forging.

Specific embodiment

The present invention is described in further detail below by way of instantiation

Step one：

Materials procurement：Raw material GH4033, specification Φ 65, smelting process：Vacuum induction melting Plus vacuum consumable remelting, acceptance criteria GJB1953A-2008, grain size be not coarser than GB/T6394 rule Fixed 3 grades.

Step 2：

Forging is waste：Analysis forging drawing, the shape, size and technical requirements and raw material according to forging Specifications design famine type structure, specific famine type structure is as shown in Figure 3：

1) waste type is divided to two fire to complete, the first fire：Sub-material simultaneously pulls out bar portion to mouth 45；

2) the second fire is forged to waste type figure size；

3) fillet R3～R5 is not noted；

Waste swaged forging manufacturing apparatus：560Kg flat-die hammers.

Heating schedule：Gas furnace is heated, and≤800 DEG C enter stove, and 850 ± 50 DEG C × 60min is preheated, 1120 ± 20 DEG C × 52min is warming up to again.

FMT is required：

1) transfer time≤20S；2) terminal temperature >=900 DEG C；

3) forging famine is carried out by waste type figure, two fire are completed, and two fire melt down and do not preheat, high temperature dwell 20 minutes warm time；

4) cooling after forged mode：Air cooling.

Step 3：

Die forging：

The fiery die forging of head：Forging equipment：3 tons of die hammers.

Heating schedule：Gas furnace is heated, and≤800 DEG C enter stove, and 850 ± 50 DEG C × 35min is preheated, 1120 ± 20 DEG C × 30min is warming up to again.

1) 250 DEG C～350 DEG C of preheated mold；2) transfer time≤10S；

3) terminal temperature >=900 DEG C；4) under-voltage amount >=7mm after head fire；

5) head fire hammer number >=7 time, the deflection for often hammering is less than 15%, and hammers every time Time interval 3 seconds～5 seconds；

6) cooling after forged mode：Air cooling.

Two fiery die forgings：Forging equipment：3 tons of die hammers.

Heating schedule：Gas furnace is heated, and≤800 DEG C enter stove, and 850 ± 50 DEG C × 35min is preheated, 1120 ± 20 DEG C × 25min is warming up to again.

1) 250 DEG C～350 DEG C of preheated mold；2) transfer time≤10S；

3) terminal temperature >=900 DEG C；

4) two fiery hammer number >=5 time, the deflection for often hammering is less than 10%, and hammers every time Time interval 3 seconds～5 seconds；

5) cooling after forged mode：Air cooling.

Step 4：

Heat treatment：Batching is by same piece number, the same material trade mark, same hearth number, same rule Lattice and same heat treatment heat are constituted

Solid solution 1080 ± 10 DEG C × 5h air coolings

Timeliness 700 ± 10 DEG C × 16h air coolings

Step 5：

Physico-chemical tests：Forging 100% carries out hardness test, and hardness number is taken in hardness acceptability limit most It is high and minimum each one carry out Physico-chemical tests, including drawing by high temperature, high-temperature and durable, longitudinal low power and High power is checked at blade.

Longitudinal low power inspection has no metallurgical and forging defect, as shown in Figure 4.

Blade high power metallographic structure, mean grain size is 4 grades, as shown in figure 5, meet agreement will Ask.

Mechanical property：Drawing by high temperature and high-temperature and durable reach standard requirement.

Claims (1)

1. a kind of forging method of superalloy turbine movable vane piece, it is characterised in that comprise the steps,

Step one：Raw material selection GH4033, specification Φ 65, smelting process adds vacuum consumable for vacuum induction melting Remelting, acceptance criteria meets GJB1953A-2008, and grain size is not coarser than 3 grades of GB/T6394 regulations；

Step 2：Forging is waste：Analysis forging drawing, the shape, size and technical requirements and former material gauge according to forging The waste type structure of lattice design；

Step 3：Die forging：Forging equipment uses 3 tons of die hammers, selects deformation velocity and deflection, wherein head fire Under-voltage amount >=7mm afterwards, head fire hammer number >=7 time, every time the deflection of hammering is less than 15%, and hammers every time Time interval 3 seconds～5 seconds, cooling after forged mode is air cooling, and hammer number >=5 time of two fiery die forgings hammer every time Deflection be less than 10%, and the time interval for hammering every time 3 seconds～5 seconds, cooling after forged mode is air cooling；

Step 4：Heat treatment：Batching is by same piece number, the same material trade mark, same hearth number, same specification With same heat treatment heat composition；

Step 5：Physico-chemical tests：Carry out longitudinal macrostructure, high power metallographic structure, mechanics properties testing.