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Preparation Of High Hardness Hammer With 4Cr5MoSiV1 Hot Forging Die Steel
Nov 01, 2017

The composition is as follows: 1) matrix forging: 4Cr5MoSiV1 hot forging abrasive steel, the chemical composition: C 0.32% ~ 0.42%, Si0.80% ~ 1.20%, Mn ≤ 0.40%, Cr 4.5% ~ 5.5% 1.0% ~ 1.5%, V 0.8% ~ 1.0%, the rest is Fe; hot forging steel forging process: forging temperature of 750 ~ 800 ℃, forging ratio of 2.5 ~ 3.0; forging annealing process: 860 ~ 890 ℃, 1 ~ 4h, the furnace cooled to 540 ℃, air cooling;

2) matrix heat treatment: 4Cr5MoSiV1 hot work die steel forging heat treatment process: 1000 ~ 1050 ℃ oil quenching, 500 ~ 600 ℃ tempering;

3) the surface treatment of the substrate: the base of the working surface grinding, shot peening treatment; treatment of 40 to 80 mesh selection of white corundum, HRC 70 ~ 90, treatment time 1 to 2 hours;

4) Substrate surface laser cladding; (a.) Cladding material selection: The working surface laser cladding material is 146 # cobalt-based alloy powder material, the content by mass percentage: C: 0.7% ~ 1.5%, Si : 0.41% to 0.82% Fe: 2.16% to 2.85%, Ni: 2.27% to 2.5%, Cr: 29.5% to 32.4%, Mo: 0.12% to 0.26%, W: 8.7% to 17.8% ;

(b.) powder drying and matrix preheating: 146 # cobalt-based alloy powder material placed in a vacuum oven, 100 ~ 150 ℃ under the conditions of insulation 1.5 ~ 2h, natural cooling; the same time, the matrix 4Cr5MoSiV1 hot mold Steel using intelligent temperature control heating equipment, 150 ~ 200 ℃ in the preheating 1.5 ~ 2.5h;

(c.) laser cladding: each layer thickness of 3 ~ 5mm; process parameters: laser power 3KW, scanning speed 4.5 ~ 5.5mm / min, spot diameter 4mm, lap 30%, feeding powder 6 ~ 8g / min, the number of cladding layers is 3 to 5 layers;

5) mechanical processing, performance testing, storage.

current technology

The basic principle of radial forging was proposed by Austrian scientist Dr. B. Rralowetz in 1946. To the mid-70s have been 6.5MN to 25MN radial forging have come out and used in high-alloy steel and other alloys (such as tungsten alloy) of large blank and continuous casting forging. Radial forging is a method of forming a plurality of circumferentially uniformly distributed forging forces on the same plane at the same time. Precision forging hammer is one of the important parts of the precision forging machine, it is connected by the substrate in the 90 ° of the four hammer. Hammer rod connected to the crank link mechanism, driven by the crankshaft under the synchronized movement, to achieve a pair of pairs of hammer radial attack. The DA65-100 radial forging machine is widely used in the field of pressure processing of alloy structural steel, high strength alloy steel, titanium alloy and refractory alloy because of its high forging precision, simple and flexible operation. It is suitable for improving the material performance and improving the internal structure of the material. An important role.

At present, DA65-100 type forging machine used hammer design method is: first use 3Cr2W8V as the matrix material, after heat treatment to obtain high strength, hardness, better comprehensive mechanical properties. And then in the base material working surface surfacing superalloy, through the mechanical processing, the work surface forming. But because the working surface of the hammer for a long time with the hot state of hot metal contact, and bear a huge impact load and the process of metal deformation caused by the great friction, easy to produce deformation, cracks, and even break the scrapped The Active hammer for the forging machine has been difficult to meet the production requirements of high-performance alloys. Poor service conditions put high technical requirements on the hammer, such as the red hardness at high temperature, impact fatigue crack, anti-fatigue cracking, anti-crack resistance, creep resistance and so on. Therefore, the development of new long-life hammer has become a major task.

Example 2:

The chemical composition: C 0.35%, Si 0.90%, Mn ≤ 0.40%, Cr 4.5%, Mo 1.2%, V 0.9%, the rest of which is the base material for 4Cr5MoSiV1 hot forging abrasive steel. Fe for hot forging die steel forging process: forging temperature of 750 ℃, forging ratio of 2.7; forging annealing process: 860 ℃, insulation 2h, furnace cooling to 540 ℃, air cooling;

2) matrix heat treatment; 4Cr5MoSiV1 hot work die steel forging heat treatment process: 1000 ℃ oil quenching, 500 ℃ tempering;

(HRC 70 ~ 90), the treatment time is 1 ~ 2 hours; the processing time is 1 ~ 2 hours; the processing time is 1 ~ 2 hours;

4) substrate cladding surface laser cladding; a. Cladding material selection; working surface laser cladding material for the 146 # cobalt-based alloy powder material, the composition of C: 1.5%, Si: 0.82%, Fe: 2.85%, Ni : 42%, Cr: 32.4%, Mo: 0.26%, W: 17.8%, the rest are Co; b. Powder drying and substrate preheating; 146 # cobalt-based alloy powder material placed in a vacuum oven, ℃ under the conditions of insulation 1.5h, natural cooling; the same time, the matrix 4Cr5MoSiV1 hot work die steel using intelligent temperature control heating equipment, preheated at 200 ℃ 1.5h; c. Laser cladding; cladding layer 4 Layer thickness of 4 mm; process parameters: laser power 3KW, scanning speed 4.5 ~ 5.5mm / min, spot diameter 4mm, lap rate of 30%, feeding powder 8g / min;

5) mechanical processing, performance testing, storage.

Example 3: 1) matrix forging; matrix material 4Cr5MoSiV1 hot forging abrasive steel, its chemical composition: C 0.40%, Si 1.0%, Mn ≤ 0.40%, Cr 4.8%, Mo 1.3%, V 1.0%, the rest Fe ; Forging die steel forging process: forging temperature of 800 ℃, forging ratio of 3.0; forging annealing process: 890 ℃, insulation 4h, the furnace cooled to 540 ℃, air-cooled;

2) matrix heat treatment; 4Cr5MoSiV1 hot work die steel forging heat treatment process: 1050 ℃ oil quenching, 550 ℃ tempering;

(HRC 70 ~ 90), the treatment time is 1 ~ 2 hours; the processing time is 1 ~ 2 hours; the processing time is 1 ~ 2 hours;

4) Substrate surface laser cladding; a. Cladding material selection; Work surface laser cladding material is 146 # cobalt-based alloy powder material, component C: 0.7%, Si: 0.82%, Fe: 2.85%, Ni : 2.27%, Cr: 29.5%, Mo: 0.26%, W: 17.8%, the rest are Co; b. Powder drying and substrate preheating; 146 # cobalt-based alloy powder material placed in a vacuum oven, Temperature of 2h, natural cooling; at the same time, the base 4Cr5MoSiV1 hot work die steel using intelligent temperature control heating equipment, preheated at 150 ℃ 2h; c. Laser cladding; cladding layer 5 layers, each layer thickness For 3mm; process parameters: laser power 3KW, scanning speed 4.5 ~ 5.5mm / min, spot diameter 4mm, lap 30%, feeding powder 6g / min; 5) mechanical processing, performance testing, storage.


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