Heat treatment method for high-temperature alloy steel

A technology of superalloy steel and heat treatment method, which is applied in the field of heat treatment of superalloy steel, and can solve the problems of no reference value, no process parameters such as alloy solution treatment and aging treatment suitable temperature, etc., and it is difficult to achieve superalloy heat treatment process. , to achieve the effect of good high temperature plasticity and creep resistance life

Active Publication Date: 2017-03-22
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, for the research on low-cycle fatigue of GH4169 alloy, most scholars are studying the influence of temperature, frequency, etc. on the mechanical properties of materials, and there are few reports on the influence of phases on the fatigue behavior of alloys in high-temperature environments.
[0005] The publication number is "CN105695703A", and the title of the invention is "A Die Steel Heat Treatment Process". It discloses a two-fire direct heat treatment process method of 7Cr7Mo2V2Si high-strength and toughness cold-work die steel preparatory heat treatment and quenching and tempering. From the parameters introduced Look, only the hardness and wear resistance of the mold steel have some effect, but it is difficult to achieve the high temperature alloy heat treatment process, which has basically no reference value
[0006] "Numerical Simulation of the Vacuum Aging Process of GH4169 Alloy Parts", Metal Heat Treatment, Volume 31, Issue 1, discloses the simulation calculation of the temperature field during the vacuum aging process of GH4169 alloy parts, and conducts simple verification, but does not provide alloy solution treatment and aging treatment The appropriate temperature and other process parameters

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A sort of The high-temperature diffusion annealing process for GH4169 high-temperature alloy steel ingots of different sizes is as follows: 1150±10°C, heat preservation for 24 hours, and then air-cooling at 1190±10°C for 72 hours, and after 7 times of pier thickening and elongation thermal processing, the pier thickness reaches For round cakes, the subsequent heat treatment process includes the following steps:

[0036] (1) Pretreatment after forging: heating temperature is 960°C, heat preservation for 1h, and air cooling;

[0037] (2) High temperature solution treatment: heating temperature is 900°C, heat preservation for 22h, air cooling; reheating, heating temperature is 950°C, heat preservation for 1.5h, air cooling;

[0038] (3) Low-temperature aging treatment: heating temperature is 720°C, heat preservation for 8 hours, cooling to 620°C with the furnace at a rate of 50°C / h, heat preservation for 8 hours, and air cooling.

[0039] The final grain level of the f...

Embodiment 2

[0042] A sort of The high-temperature diffusion annealing process for GH4169 high-temperature alloy steel ingots of different sizes is as follows: heat preservation at 1150±10°C for 24 hours, then heat preservation at 1190±10°C for 72 hours, and air cooling. For round cakes, the subsequent heat treatment process includes the following steps:

[0043] (1) Pretreatment after forging: heating temperature is 950°C, heat preservation for 1h, and air cooling;

[0044](2) High temperature solution treatment: heating temperature is 910°C, heat preservation for 24 hours, air cooling, reheating, heating temperature is 960°C, heat preservation for 2 hours, air cooling;

[0045] (3) Low-temperature aging treatment: heating temperature is 710°C, heat preservation for 9 hours, cooling with the furnace at a rate of 60°C / h to 610°C, heat preservation for 9 hours, and air cooling.

[0046] The final grain level of the forging is 8.2;

[0047] The forgings were subjected to high temperatur...

Embodiment 3

[0049] A sort of The high-temperature diffusion annealing process for GH4169 high-temperature alloy steel ingots of different sizes is as follows: heat preservation at 1150±10°C for 24 hours, then heat preservation at 1190±10°C for 72 hours, and air cooling. For round cakes, the subsequent heat treatment process includes the following steps:

[0050] (1) Pretreatment after forging: heating temperature is 940°C, heat preservation for 1h, and air cooling;

[0051] (2) High temperature solution treatment: heating temperature is 920°C, heat preservation 18h, air cooling, reheating, heating temperature is 970°C, heat preservation 1h, air cooling;

[0052] (3) Low-temperature aging treatment: Heating temperature is 700°C, heat preservation for 10h, cooling with the furnace at a speed of 55°C / h to 600°C, heat preservation for 7h, and air cooling.

[0053] The final grain grade of the forging is 8.4;

[0054] The forgings were subjected to high-temperature and low-cycle creep-fat...

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Abstract

The invention belongs to the technical field of alloy steel and particularly relates to a heat treatment method for high-temperature alloy steel. The heat treatment method comprises the steps of a, a high-temperature diffusion annealing process, wherein a high-temperature alloy steel ingot is heated for 22-26 h at the temperature of 1,150 plus or minus 10 DEG C, then heating is conducted for 70-74 h at the temperature of 1,190 plus or minus 10 DEG C, and then air cooling is conducted; b, pretreatment after forging, wherein the heating temperature is 950 plus or minus 10 DEG C, the temperature is kept for 0.5-1.5 h, and then air cooling is conducted; c, high-temperature solid solution treatment, wherein the heating temperature is 910 plus or minus 10 DEG C, the temperature is kept for 18-24 h, and then air cooling is conducted; and reheating is conducted, the heating temperature is 960 plus or minus 10 DEG C, the temperature is kept for 1-2 h, and air cooling is conducted; and d, low-temperature aging treatment, wherein the heating temperature is 710 plus or minus 10 DEG C, the temperature is kept for 7-10 h, then the temperature is decreased to 610 plus or minus 10 DEG C at the speed of 50-60 DEG C/h with furnace cooling, then the temperature is kept for 7-10 h, air cooling is conducted, and a forging is obtained. By the adoption of the heat treatment method for the GH4169 high-temperature alloy steel, the heating pretreatment after forging, high-temperature solid solution treatment and low-temperature aging treatment thermal treatment process system is adopted, the high-temperature plasticity is good and the creep resistance life is long.

Description

technical field [0001] The invention belongs to the technical field of alloy steel, and in particular relates to a heat treatment method for high-temperature alloy steel. Background technique [0002] The annual output of GH4169 alloy accounts for 45% of the total output of deformed superalloys, and it is one of the largest superalloys at present. GH4169 alloy is a niobium-strengthened precipitation-hardening iron-nickel-based superalloy. The alloy has high strength, high fatigue performance and good plasticity at high temperatures, so it is widely used in aviation, aerospace, nuclear energy and petroleum and other fields. In China, parts such as turbine discs of this material are generally produced by hydraulic press forging and hammer forging. [0003] The strengthening mechanism of superalloys mainly includes solid solution strengthening and precipitation strengthening, and the heat treatment method of GH4169 alloy is mainly composed of two parts: solution treatment and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D6/00
CPCC21D6/00
Inventor 罗许李俊洪刘韶华谢珍勇罗通伟蔡武刘序江肖强屈小科左军
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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