Preparation process of cobalt-based wear-resistant material welding wire

Abstract

The invention belongs to the field of welding, and particularly relates to a preparation process of a cobalt-based wear-resistant material welding wire. According to the technical scheme, the preparation technology of the cobalt-based wear-resistant material welding wire comprises the following steps that (1) a master alloy is prepared; the cobalt-based wear-resistant material comprises the following material components: 25.0-32.0 parts of Mo, 15.0-20.0 parts of Cr, 2.5-4.0 parts of Si, less than or equal to 3.0 parts of Ni + Fe, less than or equal to 0.08 part of C, less than or equal to 0.03 part of O, less than or equal to 0.03 part of P, less than or equal to 0.03 part of S and the balance of Co. The preparation process comprises the following steps of (1) preparation of a cobalt-based wear-resistant material welding wire, (2) powder preparation through an inert gas atomization method, (3) hot isostatic pressing forming, (4) heat treatment and (5) polishing to obtain a finished wire material.The prepared cobalt-based wear-resistant material welding wire can be used for preparing a blade crown wear-resistant layer meeting performance requirements, and the problem of wear aging of the surface of a crown is solved.

Description

Technical Field

[0001] This invention belongs to the field of welding, specifically relating to a preparation process of a cobalt-based wear-resistant welding wire. Background Technology

[0002] When engine blades are working, they are subjected to strong vibration and alternating stress. The fretting wear of the damping surfaces of the serrated crowns of the two contacting blades is very severe. After the wear, the gap between the serrated crowns increases, the blade vibration intensifies, and the blade breaks from the stress concentration point at the root, affecting the safety of use.

[0003] Surface hardening of the blade crown with a layer of high-temperature wear-resistant material is an effective measure to solve its wear failure. The composition and texture of wear-resistant alloy materials, the wear-resistant phases and their distribution, and the interfacial characteristics of dissimilar alloys all have complex effects on welding processability and the microstructure of the fusion zone. Further analysis of the welding wire's processability and microstructure characteristics reveals that, through adjusting the micro-ratio of the welding wire and iterative verification, the optimal welding wire alloy with the best processability and metallurgical properties is selected. Evaluation is then conducted using indicators such as metal fluidity, molten pool spreadability, and dilution rate of dissimilar interface reactions, ultimately selecting cobalt-based wear-resistant materials for the hardening welding wire. However, cobalt-based wear-resistant materials have high melting points, high alloy hardness, high brittleness, and poor deformation capacity, making them unsuitable for deformation processing and difficult to prepare as hardening welding wires. Summary of the Invention

[0004] This invention provides a process for preparing cobalt-based wear-resistant material welding wire. The prepared cobalt-based wear-resistant material welding wire can be used to prepare a wear-resistant layer for blade crowns that meets performance requirements, thus solving the problem of wear and aging on the surface of the blade crown.

[0005] The technical solution of the present invention is as follows: A process for preparing a cobalt-based wear-resistant welding wire includes the following steps: 1) Preparation of master alloy; the material composition is as follows: Mo 25.0~32.0, Cr 15.0~20.0, Si 2.5~4.0, Ni+Fe≤3.0, C≤0.08, O≤0.03, P≤0.03, S≤0.03, balance Co. The cobalt-based wear-resistant material master alloy was prepared by vacuum induction melting. 2) Inert gas atomization powder preparation: The cobalt-based wear-resistant material master alloy is prepared by inert gas atomization using a vacuum melting method to obtain cobalt-based wear-resistant material powder; 3) Hot isostatic pressing; The cobalt-based wear-resistant material powder is subjected to hot isostatic pressing to obtain a cobalt-based wear-resistant material blank; 4) Heat treatment; The cobalt-based wear-resistant material blank is subjected to annealing heat treatment to relieve stress; 5) Polishing to finished wire material; Polish the heat-treated cobalt-based wear-resistant material blank to finished wire material to obtain cobalt-based wear-resistant material welding wire.

[0006] Furthermore, in the preparation process of the cobalt-based wear-resistant welding wire, in step 1), the casting temperature of vacuum induction melting is controlled at the melting point +40℃~60℃.

[0007] Furthermore, in the preparation process of the cobalt-based wear-resistant welding wire, the process parameters in step 2) are as follows: melting temperature is 1450℃~1700℃, holding time is 10min~20min, atomizing gas is high-purity argon, pressure is 2.0MPa~3.0MPa, and atomizing gas-liquid ratio is 0.4~0.8.

[0008] Furthermore, in the preparation process of the cobalt-based wear-resistant welding wire, in step 3), the hot isostatic pressing temperature is 1080℃~1200℃, and the holding time is 3h~5h.

[0009] Furthermore, in the preparation process of the cobalt-based wear-resistant welding wire, in step 4), the annealing heat treatment temperature is 1050℃~1150℃.

[0010] The beneficial effects of the present invention are as follows: the cobalt-based wear-resistant material welding wire prepared by the present invention can prepare a blade crown wear-resistant layer that meets the performance requirements, and solve the wear aging problem of the blade crown surface; the microstructure and properties of the cobalt-based wear-resistant material welding wire and the microstructure and properties of the wear-resistant layer after welding are superior to those of traditional process welding wire, thereby improving the quality qualification rate of the wear-resistant layer of the parts. Attached Figure Description

[0011] Figure 1 A process flow diagram for the preparation of cobalt-based wear-resistant welding wire; Figure 2 This is a metallographic diagram of the wear-resistant layer after welding with cobalt-based wear-resistant material welding wire. Detailed Implementation

[0012] like Figure 1 As shown, a preparation process for a cobalt-based wear-resistant welding wire includes the following steps: 1) Preparation of master alloy; the material composition is as follows: Mo 28.0, Cr 17.0, Si 2.9, Ni+Fe≤3.0, C≤0.08, O≤0.03, P≤0.03, S≤0.03, balance Co. The cobalt-based wear-resistant material master alloy is prepared by vacuum induction melting; the casting temperature of vacuum induction melting is controlled at melting point +50℃. 2) Inert gas atomization powder preparation: The cobalt-based wear-resistant material master alloy is prepared by inert gas atomization using a vacuum melting method to obtain cobalt-based wear-resistant material powder; the process parameters are as follows: melting temperature is 1600℃, holding time is 15min, atomizing gas is high-purity argon, pressure is 2.5MPa, and atomizing gas-liquid ratio is 0.6. 3) Hot isostatic pressing; the cobalt-based wear-resistant material powder is hot isostatically pressed to obtain a cobalt-based wear-resistant material strip; the hot isostatic pressing temperature is 1150℃ and the holding time is 4h; 4) Heat treatment; The cobalt-based wear-resistant material blank is subjected to annealing heat treatment to relieve stress; The annealing heat treatment temperature is 1080℃; 5) Polishing to finished wire material; Polish the heat-treated cobalt-based wear-resistant material blank to finished wire material to obtain cobalt-based wear-resistant material welding wire.

[0013] The wear-resistant layer of the blade crown was prepared by overlay welding of the above-mentioned cobalt-based wear-resistant material welding wire, and its metallographic structure is as follows: Figure 2 As shown; the room temperature tensile, shear properties, high temperature instantaneous properties, and high temperature hardness of the wear-resistant layer are shown in Tables 1 to 3, respectively. Table 1. Room temperature tensile and shear properties of the wear-resistant layer Sample number <![CDATA[R m / MPa]]> Sample number <![CDATA[τ b / MPa]]> 1# 631 1# 507 2# 699 2# 369 3# 693 3# 504 4# 665 4# 450 5# 737 5# 649 Table 2 High-Temperature Instantaneous Performance of Wear-Resistant Layer Temperature / °C Sample number <![CDATA[R m / MPa]]> A / % Temperature / °C Sample number <![CDATA[R m / MPa]]> A / % 900 1# 480 4.0 980 1# 326 2.5 2# 470 4.0 2# 347 3.0 3# 478 3.5 3# 358 4.0 4# 466 4.5 4# 363 2.0 5# 475 4.0 5# 368 2.0 Table 3 High-temperature hardness of wear-resistant layer Temperature / °C Sample number Hardness / HV average value Temperature / °C Sample number Hardness / HV average value 850 1# 432、472、460 455 900 1# 426、400、395 407 2# 426、438、428 431 2# 383、408、431 407 3# 470、442、460 457 3# 417、410、395 407 4# 432、403、403 413 4# 414、427、430 424 5# 450、430、428 436 5# 410、410、403 408 6# 435、435、433 434 6# 408、413、407 409 7# 440、459、427 442 7# 441、398、388 409 The test results of the friction coefficient and wear volume of the wear-resistant layer are shown in Tables 4 and 5, respectively; Table 4. Friction coefficient test results Sample 1 Sample 2 Sample 3 Sample 4 Sample 5 average value coefficient of friction 0.409 0.378 0.369 0.368 0.376 0.380 0.419 0.401 0.380 0.373 0.409 0.396 Table 6 Wear Volume Test Results Sample 1 Sample 2 Sample 3 Sample 4 Sample 5 average value <![CDATA[Wear volume / * 10 5 μm 3 > 10.941 7.351 11.666 6.992 8.515 9.093 4.587 13.530 12.945 9.608 9.850 10.104

Claims

1. A preparation process for a cobalt-based wear-resistant welding wire, characterized in that, Includes the following steps: 1) Preparation of master alloy; the material composition is as follows: Mo 25.0~32.0, Cr 15.0~20.0, Si 2.5~4.0, Ni+Fe≤3.0, C≤0.08, O≤0.03, P≤0.03, S≤0.03, balance Co. The cobalt-based wear-resistant material master alloy was prepared by vacuum induction melting. 2) Inert gas atomization powder preparation: The cobalt-based wear-resistant material master alloy is prepared by inert gas atomization using a vacuum melting method to obtain cobalt-based wear-resistant material powder; 3) Hot isostatic pressing; The cobalt-based wear-resistant material powder is subjected to hot isostatic pressing to obtain a cobalt-based wear-resistant material blank; 4) Heat treatment; The cobalt-based wear-resistant material blank is subjected to annealing heat treatment to relieve stress; 5) Polishing to finished wire material; Polish the heat-treated cobalt-based wear-resistant material blank to finished wire material to obtain cobalt-based wear-resistant material welding wire.

2. The preparation process of the cobalt-based wear-resistant welding wire according to claim 1, characterized in that, In step 1), the casting temperature of vacuum induction melting is controlled between the melting point and 40°C to 60°C.

3. The preparation process of the cobalt-based wear-resistant welding wire according to claim 1, characterized in that, In step 2), the process parameters are as follows: melting temperature is 1450℃~1700℃, holding time is 10min~20min, atomizing gas is high-purity argon, pressure is 2.0MPa~3.0MPa, and atomizing gas-liquid ratio is 0.4~0.

8.

4. The preparation process of the cobalt-based wear-resistant welding wire according to claim 1, characterized in that, In step 3), the hot isostatic pressing temperature is 1080℃~1200℃, and the holding time is 3h~5h.

5. The preparation process of the cobalt-based wear-resistant welding wire according to claim 1, characterized in that, In step 4), the annealing heat treatment temperature is 1050℃~1150℃.

Images