Method for refining surface grains of 2Cr10NiMoVNb stainless steel forgings through quenching three times

A technology for stainless steel and forgings, which is applied in the field of three-time quenching to refine the surface grains of 2Cr10NiMoVNb stainless steel forgings. effect of the method

Active Publication Date: 2014-02-05
AECC AVIATION POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention is used to refine grains by improving the melting method of alloys, but it is not suitable for grain refinement of martensitic stainless steel

Method used

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  • Method for refining surface grains of 2Cr10NiMoVNb stainless steel forgings through quenching three times
  • Method for refining surface grains of 2Cr10NiMoVNb stainless steel forgings through quenching three times
  • Method for refining surface grains of 2Cr10NiMoVNb stainless steel forgings through quenching three times

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Effect test

Embodiment 1

[0020] This embodiment is a method for refining the surface layer grains of 2Cr10NiMoVNb stainless steel forgings. The forging is a pie-shaped workpiece. Before the round cake-shaped workpiece has three times of quenching and grain refinement heat treatment, the normal heat treatment system is quenching + tempering, and coarse grains often appear on the surface of the part, and the local grains reach (3-4) mm.

[0021] The concrete process of this embodiment is:

[0022] Step 1: First quenching: first heat the air furnace to 950°C, put the forging in the air furnace, and raise the temperature to 950°C, and then keep it warm; Obtain the forging after the first quenching; wherein the holding time of this step is obtained by adding the basic holding time and the holding time determined according to the maximum thickness of the forging; the basic holding time is 30min, and the holding time determined according to the maximum thickness of the forging is: The holding time correspo...

Embodiment 2

[0032] This embodiment is a method for refining the surface layer grains of 2Cr10NiMoVNb stainless steel forgings. The forging is an annular workpiece. The normal heat treatment system of the ring-shaped workpiece is quenching + tempering before three times of heat treatment for quenching and grain refinement. Coarse grains often appear on the surface of the part, and the local grains reach (2-3) mm.

[0033] The concrete process of this embodiment is:

[0034] Step 1: First quenching: firstly heat the air furnace to 1000°C, put the forging into the air furnace, and raise the temperature to 1000°C, and then keep it warm; Obtain the forging after the first quenching; wherein the holding time of this step is obtained by adding the basic holding time and the holding time determined according to the maximum thickness of the forging; the basic holding time is 30min, and the holding time determined according to the maximum thickness of the forging is: The holding time correspondin...

Embodiment 3

[0044] This embodiment is a method for refining the surface layer grains of 2Cr10NiMoVNb stainless steel forgings. The forging is a cuboid workpiece. The normal heat treatment system of the cuboid workpiece is quenching + tempering before three quenching and grain refinement heat treatments. Coarse grains often appear on the surface of the part, and the local grains reach (4-5) mm.

[0045] The concrete process of this embodiment is:

[0046] Step 1: First quenching: first heat the air furnace to 1050°C, put the forging in the air furnace, and raise the temperature to 1050°C, and then keep it warm; Obtain the forging after the first quenching; wherein the holding time of this step is obtained by adding the basic holding time and the holding time determined according to the maximum thickness of the forging; the basic holding time is 30min, and the holding time determined according to the maximum thickness of the forging is: The holding time corresponding to each mm thickness ...

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Abstract

The invention proposes a method for refining surface grains of 2Cr10NiMoVNb stainless steel forgings through quenching three times. A thermal treatment quenching procedure of refining grains twice is added before final thermal treatment quenching and tempering of spare parts; the twice quenching procedure is about 100 DEG C lower than the traditional quenching procedure in temperature, so that the grains are evenly refined. According to the method, aiming at uneven fineness of the grains in 2Cr10NiMoVNb alloy forging structures, the quenching collocation of combining middle temperature (about 150-250 DEG C over the austenite transformation temperature), low temperature (about 100-200 DEG C over the austenite transformation temperature), and high temperature (about 300 DEG C over the austenite transformation temperature) is adopted, so that the forgings are repeatedly subjected to austenite-martensite transformation, the large grains are gradually refined in the transformation process, and finally, the alloy structure is homogenized and the grains are refined. The adopted thermal treatment technology for refining the grains is simple, and can be achieved by heating and heat preservation, and air cooling; a complicated technique is avoided.

Description

technical field [0001] The invention relates to the field of forging and heat treatment, in particular to a method for refining surface grains of 2Cr10NiMoVNb stainless steel forgings by triple quenching. Background technique [0002] For martensitic stainless steel, if the heating temperature is too high above 1200°C, or the forging deformation is too small or uneven, the tendency to form coarse martensite structure and low-magnification coarse grains after cooling is very large, often after heat treatment of forgings. Low-magnification coarse grains appear on the surface of the forging, and the existence of coarse grains will significantly reduce the mechanical properties, intergranular corrosion resistance, and welding performance of the material. [0003] 2Cr10NiMoVNb 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/19
Inventor 寇录文霍世军杨辉雷丹曹伟
Owner AECC AVIATION POWER CO LTD
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