Thermal treatment method for eliminating structural heredity of high-toughness steel

A heat treatment method and a technology of tissue inheritance, applied in the field of heat treatment to eliminate tissue inheritance of high-strength and tough steel, can solve the problems of strong tissue inheritance, and achieve the effect of eliminating tissue inheritance

Active Publication Date: 2015-07-22
INNER MONGOLIA NORTH HEAVY INDS GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

38CrNi3MoVA high-strength and tough steel has a high degree of alloying and good comprehensive mechanical properties, but its structure inheritance is strong.

Method used

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  • Thermal treatment method for eliminating structural heredity of high-toughness steel
  • Thermal treatment method for eliminating structural heredity of high-toughness steel
  • Thermal treatment method for eliminating structural heredity of high-toughness steel

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Effect test

Embodiment 1

[0011] The present invention is for 38CrNi3MoVA high-strength toughness steel part, according to figure 1 Method After the forging is completed, enter the furnace as soon as possible and cool to 250°C for heat preservation. After heat preservation for 1 hour, the temperature rises. The heating temperature is 890°C, and the heat preservation time is 6 hours. , out of the oven and air cooled to room temperature. Since the 38CrNi3MoVA high-strength and tough steel parts with martensite or bainite non-equilibrium structure after forging are re-austenitized at a heating temperature of 890°C, the recrystallization of the α phase is realized, and the temperature is kept at 610°C After 55 hours, the structure is fully transformed, and a balanced structure composed of fine carbide particles and ferrite structure is obtained. See 2 for the metallographic structure diagram.

Embodiment 2

[0013] The present invention is for 38CrNi3MoVA high-strength toughness steel part, according to figure 1 Method After the forging is completed, enter the furnace as soon as possible and cool to 250°C for heat preservation. After 2 hours of heat preservation, the temperature rises. The heating temperature is 890°C, and the heat preservation time is 6 hours. , out of the oven and air cooled to room temperature. Since the 38CrNi3MoVA high-strength and tough steel parts with martensite or bainite non-equilibrium structure after forging are re-austenitized at a heating temperature of 890°C, the recrystallization of the α phase is realized, and the temperature is kept at 610°C After 55 hours, the structure is fully transformed, and a balanced structure composed of fine carbide particles and ferrite structure is obtained. See 2 for the metallographic structure diagram.

Embodiment 3

[0015] The present invention is for 38CrNi3MoVA high-strength toughness steel part, according to figure 1 Method After the forging is completed, put it into the furnace as soon as possible and cool it to 270°C for heat preservation. After heat preservation for 1 hour, the temperature rises. The heating temperature is 890°C, and the heat preservation time is 6 hours. , out of the oven and air cooled to room temperature. Since the 38CrNi3MoVA high-strength and tough steel parts with martensite or bainite non-equilibrium structure after forging are re-austenitized at a heating temperature of 890°C, the recrystallization of the α phase is realized, and the temperature is kept at 610°C After 55 hours, the structure is fully transformed, and a balanced structure composed of fine carbide particles and ferrite structure is obtained. See 2 for the metallographic structure diagram.

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Abstract

The invention relates to a thermal treatment method for eliminating the structural heredity of high-toughness steel, and belongs to the field of ferrous metallurgy. The thermal treatment method comprises the following steps: (1) completing forging of a 38 CrNi3MoVA high-toughness steel part, then putting the part in a furnace, and carrying out furnace cooling and heat preservation on the part; (2) carrying out heating austenization and heat preservation on the part subjected to heat preservation; (3) after heat preservation again, carrying out furnace cooling and heat preservation; and (4) carrying out furnace cooling on the part subjected to furnace cooling and heat preservation again, then discharging, and carrying out air cooing to room temperature. According to the thermal treatment method, as the forged 38 CrNi3MoVA high-toughness steel part which has a martensite or bainite non-equilibrium structure is austenitized again, the recrystallization of an alpha phase is realized, fine carbide particles and a ferritic structure are obtained, the structural heredity is eliminated, and a good original structure is provided for follow-up thermal treatment.

Description

technical field [0001] The invention relates to a heat treatment method for eliminating the inheritance of high-strength and tough steel structures, belonging to the field of iron and steel metallurgy. Background technique [0002] Heating the coarse-grain ordered structure above A C3 , may lead to the formation of austenite grains with the same shape, size and orientation as the original grains, this phenomenon is called the organization inheritance of steel. 38CrNi3MoVA high-strength and tough steel has a high degree of alloying and good comprehensive mechanical properties, but its structure is strong. In the actual production process, the final forging temperature of 38CrNi3MoVA high-strength and tough steel is above 850 ° C. After forging, the original orderly coarse-grained structure formed by forging often appears, which is a non-metal structure of bainite + martensite + retained austenite. Balanced structure, uneven structure, if heating austenitization with non-equ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/00C21D1/78
Inventor 王晓军杜月和韩非刘奇珍王雅静
Owner INNER MONGOLIA NORTH HEAVY INDS GROUP
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