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CN-121992251-A - GH4698 alloy small-sized bar and preparation method thereof

CN121992251ACN 121992251 ACN121992251 ACN 121992251ACN-121992251-A

Abstract

The invention discloses a GH4698 alloy small-size bar and a preparation method thereof, belonging to the technical field of alloy processing; solves the problems of uneven grain structure of the GH4698 small-specification bar structure and low qualification rate of the small-specification bar caused by partial 0-level and 00-level large grains in the prior art. The invention provides a GH4698 alloy small-sized bar, which comprises, by mass, 0.030-0.080 wt% of C, less than or equal to 0.50wt% of Si, less than or equal to 0.40wt% of Mn, and Cr:13.0 to 16.0 weight percent, mo:2.80 to 3.20 weight percent of Al:1.45 to 1.80 weight percent of Ti:2.35 to 2.75 weight percent of Fe: less than or equal to 2.00wt percent, nb:1.80 to 2.20 weight percent of Mg: less than or equal to 0.0080wt%, ce: less than or equal to 0.0050wt%, zr: less than or equal to 0.050wt%, B: less than or equal to 0.015wt percent, and the balance of Ni and unavoidable impurities. The invention realizes the purpose of controlling the abnormal growth of grains of the GH4698 small-specification bar so as to lead the grain structure to be uniform, and provides a new scheme for improving the quality of the GH4698 small-specification bar and improving the product percent of pass.

Inventors

  • LIU ZHEN
  • JU QUAN
  • XU GUOHUA
  • HAN GUANGWEI
  • ZHANG YAWEI

Assignees

  • 北京钢研高纳科技股份有限公司

Dates

Publication Date
20260508
Application Date
20241108

Claims (10)

  1. 1. A GH4698 alloy small-sized bar is characterized by comprising the following components in percentage by mass, wherein the balance of C:0.030～0.080wt％,Si:≤0.50wt％,Mn:≤0.40wt％,Cr：13.0～16.0wt％,Mo：2.80～3.20wt％,Al：1.45～1.80wt％,Ti：2.35～2.75wt％,Fe：≤2.00wt％,Nb：1.80～2.20wt％,Mg：≤0.0080wt％,Ce：≤0.0050wt％,Zr：≤0.050wt％,B：≤0.015wt％, is Ni and unavoidable impurities.
  2. 2. The small-sized rod of GH4698 alloy according to claim 1, wherein the components thereof comprise C:0.050～0.080wt％,Si:≤0.35wt％,Mn:≤0.30wt％,Cr：14.0～16.0wt％,Mo：2.90～3.20wt％,Al：1.45～1.70wt％,Ti：2.55～2.75wt％,Fe：0.46～1.50wt％,Nb：1.90～2.20wt％,Mg：0.0020～0.0080wt％,Ce：0.0020～0.0050wt％,Zr：0.0030～0.0050wt％,B：0.0060～0.010wt％, the balance Ni and unavoidable impurities in mass percent.
  3. 3. The small-sized rod of GH4698 alloy according to claim 2, wherein the components thereof comprise :C：0.05wt％,Si:0.35wt％,Mn:0.10wt％,Cr：14.7wt％,Mo：2.95wt％,Al：1.47wt％,Ti：2.65wt％,Fe：0.75wt％,Nb：1.96wt％,Mg：0.0040wt％,Ce：0.0020wt％,Zr：0.0040wt％,B：0.0070wt％, the balance Ni and unavoidable impurities in weight percent.
  4. 4. A method for preparing a small-sized rod of a GH4698 alloy, characterized by being used for preparing a small-sized rod of a GH4698 alloy as claimed in any one of claims 1 to 3, comprising the steps of: step 1, determining the components and the contents of the GH4698 alloy small-size bar according to design requirements; step 2, utilizing vacuum induction and vacuum consumable duplex purification smelting to obtain an ingot; Step 3, carrying out homogenizing diffusion annealing treatment on the cast ingot obtained in the step 2; Step 4, forging, cogging and rolling the cast ingot treated in the step 3 to obtain a bar blank; and 5, carrying out secondary homogenization treatment on the bar blank obtained in the step 4 to obtain the GH4698 alloy small-size bar.
  5. 5. The method for producing a small-sized rod of GH4698 alloy according to claim 4, further comprising step 6; And 6, performing finish rolling treatment on the bar blank subjected to the secondary homogenization treatment to obtain a thin bar.
  6. 6. The method for producing a small-sized rod of GH4698 alloy according to claim 5, further comprising step 7; and 7, carrying out special heat treatment on the thin bar obtained by the finish rolling in the step 6.
  7. 7. The method for producing a small-sized rod of GH4698 alloy according to claim 6, further comprising step 8; and 8, performing heat treatment on the bar obtained after the special treatment in the step 7, and checking the structure and the performance of the bar.
  8. 8. The method for producing small-sized bars of GH4698 alloy according to claim 4, wherein in the step 2, the ingot size is 150 to 700mm in diameter.
  9. 9. The method for producing small-sized bars of GH4698 alloy according to claim 4, wherein in the step 3, the heat preservation temperature is 1160-1200 ℃ and the heat preservation time is 20-60 hours during the homogenizing and diffusing treatment.
  10. 10. The method for preparing the GH4698 alloy small-size bar according to claim 4, wherein the GH4698 alloy small-size bar has a size of phi 5-30mm.

Description

GH4698 alloy small-sized bar and preparation method thereof Technical Field The invention relates to the technical field of alloy processing, in particular to a GH4698 alloy small-size bar and a preparation method thereof. Background With the rapid development of aviation and aerospace industry, the demand for high-performance nickel-based superalloys is also continuously increasing. GH4698 nickel-based superalloy thin rods are commonly used in engine high temperature bolt fasteners. At present, GH4698 small-size bars (phi 5-30 mm) prepared by a metallurgical factory are subjected to standard heat treatment, the problems that the grain size is larger and abnormal grain growth exists locally are commonly caused, the 0-grade and 00-grade coarse grains exist, the mixed crystal is serious, the grains are seriously uneven, and the technical index cannot be met. In the using process of the machine, a plurality of bolts are broken due to serious mixed crystal tissues. Therefore, the production process of the GH4698 alloy bar is optimized and the product qualification rate is improved. The GH4698 alloy small-sized bar has the problems that the grain size is larger, the abnormal growth of grains is locally caused, and the abnormal growth of grains is more serious when the bar size is smaller. Disclosure of Invention In view of the analysis, the invention aims to provide a GH4698 alloy small-size bar and a preparation method thereof, which are used for solving the problems that the average grain size of the existing GH4698 alloy small-size bar is larger and the grains are abnormally grown locally. The aim of the invention is mainly realized by the following technical scheme: On one hand, the invention provides a GH4698 alloy small-sized bar, which comprises the following components in percentage by mass, the balance being C:0.030～0.080wt％,Si:≤0.50wt％,Mn:≤0.40wt％,Cr：13.0～16.0wt％,Mo：2.80～3.20wt％,Al：1.45～1.80wt％,Ti：2.35～2.75wt％,Fe：≤2.00wt％,Nb：1.80～2.20wt％,Mg：≤0.0080wt％,Ce：≤0.0050wt％,Zr：≤0.050wt％,B：≤0.015wt％, Ni and unavoidable impurities. In one possible design, the composition comprises C:0.050～0.080wt％,Si:≤0.35wt％,Mn:≤0.30wt％,Cr：14.0～16.0wt％,Mo：2.90～3.20wt％,Al：1.45～1.70wt％,Ti：2.55～2.75wt％,Fe：0.46～1.50wt％,Nb：1.90～2.20wt％,Mg：0.0020～0.0080wt％,Ce：0.0020～0.0050wt％,Zr：0.0030～0.0050wt％,B：0.0060～0.010wt％,% by mass of Ni and unavoidable impurities in balance. In one possible design, the composition comprises :0.05wt％,Si:0.35wt％,Mn:0.10wt％,Cr：14.7wt％,Mo：2.95wt％,Al：1.47wt％,Ti：2.65wt％,Fe：0.75wt％,Nb：1.96wt％,Mg：0.004wt％,Ce：0.0030wt％,Zr：0.0040wt％,B：0.0070wt％,% by weight of Ni and unavoidable impurities as the balance. On the other hand, the invention also provides a preparation method of the GH4698 alloy small-size bar, which is used for preparing the GH4698 alloy small-size bar and comprises the following steps: Step 1, determining the components and the content of a GH4698 alloy small-size bar according to design requirements; step 2, utilizing vacuum induction and vacuum consumable duplex purification smelting to obtain an ingot; Step 3, carrying out homogenizing diffusion annealing treatment on the cast ingot obtained in the step 2; Step 4, forging, cogging and rolling the cast ingot treated in the step 3 to obtain a bar blank; and 5, carrying out secondary homogenization treatment on the bar blank obtained in the step 4 to obtain the GH4698 alloy small-size bar. Further, the method also comprises a step 6; And 6, performing finish rolling treatment on the bar blank subjected to the secondary homogenization treatment to obtain a thin bar. Further, the method also comprises a step 7; and 7, carrying out special heat treatment on the fine bar subjected to the finish rolling treatment in the step 6. Further, the method also comprises a step 8; and 8, performing heat treatment on the bar obtained after the special heat treatment in the step 7, and checking the structure and the performance of the bar. Further, in the step 2, the size of the cast ingot is 150-700 mm in diameter. Further, in the step 3, the heat preservation temperature is 1160-1200 ℃ and the heat preservation time is 20-60 h during the homogenizing diffusion treatment. Further, the specification of the GH4698 alloy small-specification bar is phi 5-30mm. Compared with the prior art, the invention has at least one of the following beneficial effects: (1) According to the invention, the components and the content of the GH4698 alloy small-size bar are strictly controlled, so that the structure uniformity of the GH4698 alloy small-size bar is good, and the strength of the engine high-temperature bolt fastener prepared by the alloy is high and the product qualification rate is high. (2) The invention makes the bar structure and the components more uniform by carrying out the secondary homogenization process on the bar, and coordinates and uniformly deforms each part in the later rolling process, thereby effectively avoiding abnormal growth of crystal grains caused by too