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Method for refining 1Cr10Co6MoVNbN stainless steel forging grains

A technology for stainless steel and forgings, which is applied in the field of grain refinement of 1Cr10Co6MoVNbN stainless steel forgings. It can solve the problems of not being able to refine grains and only guarantee mechanical properties, and achieve grain refinement, avoiding process methods, and simple heat treatment process. Effect

Inactive Publication Date: 2012-10-17
AECC AVIATION POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the heat treatment system does not homogenize the structure, it can only guarantee the mechanical properties and cannot refine the grains. Therefore, when the forging deformation is too small or the deformation is uneven, coarse grains will be formed on the surface of the forging after heat treatment.

Method used

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  • Method for refining 1Cr10Co6MoVNbN stainless steel forging grains
  • Method for refining 1Cr10Co6MoVNbN stainless steel forging grains
  • Method for refining 1Cr10Co6MoVNbN stainless steel forging grains

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Embodiment 1

[0021] This embodiment is a method for refining grains of 1Cr10Co6MoVNbN stainless steel forgings. The stainless steel forging is a rectangular workpiece. Before the normalizing grain refinement heat treatment system was added to the rectangular workpiece, the normal heat treatment system was quenching + tempering, and coarse grains often appeared on the surface of the part, with local grains reaching (2-3) mm.

[0022] The concrete process of this embodiment is:

[0023] The first step: refinement processing. Place the rectangular workpiece in an air furnace, and carry out thinning treatment by conventional methods. The specific process of the thinning treatment is as follows: firstly heat the air furnace to 1000°C, put the rectangular workpiece into the air furnace, raise the temperature to 1000°C, and keep it warm. The holding time is determined according to the thickness of the workpiece, and the holding time is (2-3) minutes per millimeter of thickness. In this embodi...

Embodiment 2

[0030] This embodiment is a method for refining grains of 1Cr10Co6MoVNbN stainless steel forgings. The stainless steel forging is an annular workpiece. The normal heat treatment system of the annular workpiece is quenching + tempering before adding the heat treatment system of normalizing and grain refinement. Coarse grains often appear on the surface of the part, and the local grains reach (3-4) mm.

[0031] The concrete process of this embodiment is:

[0032] The first step: refinement processing. Place the ring-shaped workpiece in an air furnace, and carry out thinning treatment by conventional methods. The specific process of the thinning treatment is as follows: firstly heat the air furnace to 1050°C, put the ring-shaped workpiece into the air furnace, raise the temperature to 1050°C, and keep warm. The holding time is determined according to the thickness of the workpiece, and the holding time is (2-3) minutes per millimeter of thickness. In this embodiment, the maxi...

Embodiment 3

[0040] This embodiment is a method for refining grains of 1Cr10Co6MoVNbN stainless steel forgings. The stainless steel forging is a round rod-shaped workpiece. Before the normalizing grain refinement heat treatment system was added to the workpiece, the normal heat treatment system was quenching + tempering, and coarse grains often appeared on the surface of the part, with local grains reaching (4-5) mm.

[0041] The concrete process of this embodiment is:

[0042] The first step: refinement processing. Place the round rod-shaped workpiece in an air furnace, and carry out thinning treatment by conventional methods. The specific process of the thinning treatment is as follows: firstly heat the air furnace to 1100°C, put the round rod-shaped workpiece into the air furnace, raise the temperature to 1100°C, and keep warm. The holding time is determined according to the thickness of the workpiece, and the holding time is (2-3) minutes per millimeter of thickness. In this embodi...

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Abstract

The invention relates to a method for refining 1Cr10Co6MoVNbN stainless steel forging grains. The method comprises: carrying out refinement, quenching and tempering on a forging, and reasonably controlling temperatures and thermal insulation times in various step to obtain the grain-refined stainless steel part. According to the present invention, one time heat treatment process for grain refining is added before the final part heat treatments of quenching and tempering are performed, such that the grains can be uniformly refined; when the temperature reaches the phase change temperature, the phase change occurs, such that the phase change stress is generated inside the system due to the phase change volume effect, the formed single-phase austenite generates slightly deformation, and the austenite is subjected to recrystallization so as to achieve the grain refinement effect, improve the qualification rate, and reduce a large amount of scrap loss.

Description

technical field [0001] The invention relates to the field of forging and heat treatment, in particular to a method for refining grains of 1Cr10Co6MoVNbN stainless steel forgings. Background technique [0002] For martensitic stainless steel, if the heating temperature is too high, or the forging deformation is too small or the deformation is uneven, the tendency to form coarse martensite structure and low-magnification coarse grains after cooling is very large, and low-magnification often occurs after heat treatment of forgings. Defects of coarse grain and coarse structure, the existence of coarse grain will significantly reduce the mechanical properties, intergranular corrosion resistance and welding performance of the material. [0003] 1Cr10Co6MoVNbN is a 12% chromium type martensitic heat-strength stainless steel. The steel has high thermal strength, creep resistance, thermal stability, oxidation resistance and fatigue performance. It is suitable for the manufacture of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/28C21D1/18
Inventor 滕瑞寇录文杨辉孙雪松白亚波霍世军雷丹吴娟利池虹琳邵立桢
Owner AECC AVIATION POWER CO LTD
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