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CN-116657131-B - High-temperature impact abrasion resistant reinforcing layer and preparation method and application thereof

CN116657131BCN 116657131 BCN116657131 BCN 116657131BCN-116657131-B

Abstract

The invention relates to a high-temperature impact abrasion resistant reinforced layer, and a preparation method and application thereof, and belongs to the technical field of laser processing materials. The high-temperature impact wear resistant reinforcing layer is prepared from alloy powder with high carbide content, wherein the alloy powder with high carbide content comprises, by mass, 2.7% -3.0% of Al, 5.8% -6.3% of C, 63.5% -64.5% of Cr, 0.02% -0.04% of B, less than or equal to 200ppm of O, less than or equal to 50ppm of N, less than or equal to 5ppm of H and the balance of Ni. The reinforced layer disclosed by the invention has the advantages of high hardness and good high-temperature impact abrasion resistance, and can meet the requirements of the surface properties of key parts of a heavy-duty diesel engine.

Inventors

  • ZHAO LIN
  • PENG YUN
  • CAO YANG
  • MA CHENGYONG
  • ZHU YANJIE
  • TIAN ZHILING
  • LI CHANGHAI

Assignees

  • 钢铁研究总院有限公司

Dates

Publication Date
20260508
Application Date
20230522

Claims (10)

  1. 1. The high-temperature impact wear resistant reinforcing layer is characterized by being prepared from alloy powder with high carbide content, wherein the alloy powder with the high carbide content comprises, by mass, 2.7% -3.0% of Al, 5.8% -6.3% of C, 63.5% -64.5% of Cr, 0.02% -0.04% of B, less than or equal to 200ppm of O, less than or equal to 50ppm of N, less than or equal to 5ppm of H and the balance of Ni; The atomic number ratio of nickel equivalent to aluminum equivalent in the alloy powder with high carbide content is 3.2-3.5; The calculation principle of the equivalent atomic number of nickel is as follows: wherein Ni represents the mass percentage of Ni element in the alloy powder with high carbide content, and Cr Ni3Al Dissolving solution is 3% -7%; the calculation principle of the equivalent atomic number of aluminum is as follows: The microstructure of the alloy powder with high carbide content comprises Ni 3 Al phase, a small amount of gamma-Ni phase and carbide, the structure of the carbide mainly comprises Cr 7 C 3 , the mass content of the carbide is 63% -67%, the mass content of the gamma-Ni phase is 2.0% -5.0%, the carbide is in dispersion distribution, and the length of the carbide is 10-20 mu m; After the high-temperature impact wear-resistant reinforcing layer is used for a valve seat hole of a diesel engine cylinder cover, the average hardness of the reinforcing layer is 1000-1200 HV, the wear rate is less than or equal to 0.6X10 -5 mm 3 /N.m, the shear strength of a bonding interface of the reinforcing layer and a cylinder cover substrate is 400-500 MPa, and the average oxidation speed at 1000 ℃ is less than or equal to 0.06g/m 2 h.
  2. 2. The high-temperature impact wear resistant reinforcing layer according to claim 1, wherein the mass content of carbide in the microstructure of the alloy powder with high carbide content is 63% -65%.
  3. 3. The high-temperature impact wear resistant reinforcing layer according to claim 1, wherein the atomic ratio of nickel equivalent to aluminum equivalent in the alloy powder having a high carbide content is 3.24 to 3.5.
  4. 4. The high-temperature impact wear resistant reinforcing layer according to claim 1, wherein the alloy powder with high carbide content comprises, by mass, 2.75% -2.95% of Al, 5.82% -6.28% of C, 63.5% -64.5% of Cr, 0.02% -0.035% of B, less than or equal to 190ppm of O, less than or equal to 45ppm of N, less than or equal to 5ppm of H, and the balance of Ni.
  5. 5. A method of producing the high temperature impact wear resistant reinforcing layer according to any one of claims 1 to 4, comprising the steps of: step 1, conveying alloy powder with high carbide content to the surface of a substrate by adopting a coaxial powder conveying mode; And 2, cladding alloy powder with high carbide content on the surface of the matrix by using a laser cladding method to form a reinforcing layer.
  6. 6. The method according to claim 5, wherein in the step 1, the grain size of the intermetallic compound alloy powder with a high carbide content is controlled to be 53 μm to 124 μm.
  7. 7. The method according to claim 5, wherein in the step 1, the coaxial powder feeding amount is controlled to be 10 g/min-20 g/min.
  8. 8. The method according to claim 5, wherein in the step2, the laser cladding power is controlled to be 2200-240w, and the scanning speed is 0.36-0.60 m/min.
  9. 9. Use of the high temperature impact wear resistant reinforcing layer according to any one of claims 1 to 4 or the high temperature impact wear resistant reinforcing layer prepared by the preparation method according to any one of claims 5 to 8 for surface modification of parts of a diesel engine.
  10. 10. A diesel engine cylinder head, characterized in that a valve seat hole of the diesel engine cylinder head comprises the high temperature impact wear resistant reinforcing layer according to any one of claims 1 to 4 or the high temperature impact wear resistant reinforcing layer prepared by the preparation method according to any one of claims 5 to 8.

Description

High-temperature impact abrasion resistant reinforcing layer and preparation method and application thereof Technical Field The invention relates to the technical field of laser processing materials, in particular to a high-temperature impact abrasion resistant reinforced layer, and a preparation method and application thereof. Background The heavy-duty diesel engine has the characteristics of high mechanical load, high thermal load and low emission, and the working condition of the valve-valve seat ring friction pair is extremely bad. The valve seat ring is the most important part of the air inlet and exhaust system of the diesel engine, is arranged on the cylinder cover and forms a pair of friction pairs with the valve, so that the functions of air inlet and exhaust organization, gas sealing, heat transfer of the valve and the like are realized. The traditional valve seat rings are made of high-temperature-resistant and wear-resistant materials (such as cemented carbide and the like) and are assembled on the cylinder cover in an interference manner. However, for a heavy-duty diesel engine with high heat load and compact cylinder cover structure, there is not enough space for arranging an embedded valve seat ring, so that the valve seat hole subjected to surface strengthening treatment by adopting the cylinder cover body material is adopted, and the matching friction pair of the valve and the valve seat hole is realized. In the prior art, the surface hardening of the valve seat hole is realized by carrying out local induction quenching on the cylinder cover body material. Because the temperature of the valve seat hole of the heavy-duty diesel engine is higher, the valve continuously impacts the valve seat hole, and the valve seat Kong Gaowen subjected to induction quenching is severely worn, so that the valve seal is invalid and the valve sinking is overlarge, and the working performance and the service life of the diesel engine are seriously affected. Therefore, development of new technology for reinforcing valve seat holes of an integrated cylinder cover of a heavy-duty diesel engine is urgently needed. Disclosure of Invention In view of the above analysis, the present invention aims to provide a high temperature impact abrasion resistant reinforced layer, and a preparation method and application thereof, which are used for solving the problem of poor high temperature impact abrasion resistant performance of the existing valve seat hole. The aim of the invention is mainly realized by the following technical scheme: The invention provides a high-temperature impact wear resistant reinforcing layer which is prepared from alloy powder with high carbide content, wherein the alloy powder with high carbide content comprises, by mass, 2.7% -3.0% of Al, 5.8% -6.3% of C, 63.5% -64.5% of Cr, 0.02% -0.04% of B, less than or equal to 200ppm of O, less than or equal to 50ppm of N, less than or equal to 5ppm of H and the balance of Ni. Further, the microstructure of the alloy powder with high carbide content comprises Ni 3 Al phase, a small amount of gamma-Ni phase and carbide, the structure of the carbide mainly comprises Cr 7C3, and the mass content of the carbide is 63% -67%. Further, the atomic number ratio of nickel equivalent to aluminum equivalent in the alloy powder with high carbide content is 3.2-3.5. Further, the alloy powder with high carbide content comprises, by mass, 2.75% -2.95% of Al, 5.82% -6.28% of C, 63.5% -64.5% of Cr, 0.02% -0.035% of B, less than or equal to 190ppm of O, less than or equal to 45ppm of N, less than or equal to 5ppm of H and the balance of Ni. The invention also provides a preparation method of the high-temperature impact wear resistant reinforced layer, which comprises the following steps: step 1, conveying alloy powder with high carbide content to the surface of a substrate by adopting a coaxial powder conveying mode; And 2, cladding alloy powder with high carbide content on the surface of the matrix by using a laser cladding method to form a reinforcing layer. Further, in step 1, the grain size of the intermetallic compound alloy powder with high carbide content is controlled to be 53-124 μm. Further, in the step 1, the coaxial powder feeding amount is controlled to be 10 g/min-20 g/min. Further, in the step 2, the laser cladding power is controlled to be 2200W-2400W, and the scanning speed is 0.36 m/min-0.60 m/min. The invention also provides application of the high-temperature impact wear resistant reinforcing layer, and the high-temperature impact wear resistant reinforcing layer is used for surface modification of parts of a diesel engine. The invention also provides a diesel engine cylinder cover, and a valve seat hole of the diesel engine cylinder cover comprises the high-temperature impact wear resistant reinforcing layer. Compared with the prior art, the invention has at least one of the following beneficial effects: 1) The high-temperature impact wear resistant reinforc