Annealing Softening Method of Low Alloy Ultra High Strength Steel
An ultra-high-strength steel and low-alloy technology, applied in the field of steel heat treatment, can solve the problems of high hardness and difficult cutting of low-alloy ultra-high-strength steel materials, and achieve the effect of expanding the application field.
Active Publication Date: 2021-07-13
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to solve the problem of high hardness of the low-alloy ultra-high-strength steel material and difficult subsequent cutting and processing by changing the microstructure composition and appearance of the low-alloy ultra-high-strength steel
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Embodiment 1
[0046] Examples 1-3 Using the above-mentioned annealing and softening method, the metallographic structure of the low-alloy ultra-high-strength steel is completely transformed from martensite to larger-sized massive ferrite and spherical or short rod-shaped carbides. figure 2 Shown is the metallographic structure of the steel of Example 1 under an optical microscope before annealing and softening, which is a typical martensitic structure; figure 1 Shown is the metallographic structure of the steel of Example 1 under an optical microscope after annealing and softening, which are ferrite (white and bright structure in the figure) and carbides in the shape of spherical or short rods (black structure in the figure). image 3 Shown is the metallographic structure of the steel of Comparative Example 1 under the optical microscope after annealing and softening. Because the heating temperature is too low, the structure is tempered sorbite and fine carbides, and massive ferrite cannot ...
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Abstract
The invention discloses an annealing and softening method for low-alloy ultra-high-strength steel, which belongs to the technical field of steel heat treatment. The method anneals and softens the corresponding low-alloy ultra-high-strength steel through the steps of heating, cooling in the first stage, cooling in the second stage, and air cooling out of the furnace. The cooling rate and temperature are controlled by controlling the heating temperature and cooling in three stages. , so that the metallographic structure after annealing and softening treatment changes from martensite to larger massive ferrite and spherical or short rod-shaped carbides, and the hardness is reduced from above 300HB to less than or equal to 240HB, which solves the problem of low alloy The high hardness of ultra-high-strength steel materials and the difficulty of subsequent cutting and processing can also broaden the application field of this low-alloy ultra-high-strength martensitic steel.
Description
technical field [0001] The invention belongs to the technical field of steel heat treatment, and in particular relates to an annealing and softening method for low-alloy ultra-high-strength steel. Background technique [0002] Due to its good mechanical properties, hardenability and weldability, low-alloy ultra-high-strength steel is mainly used to manufacture parts such as outer cylinders and piston rods of aircraft landing gear. Since the high content of certain elements such as Ni and Si in low-alloy ultra-high-strength steel increases the hardness and strength of the steel, it also reduces its thermal conductivity, making it prone to work hardening during processing. The machinability of this material is extremely poor, and it is a typical aviation difficult-to-machine material. In recent years, with the development of industrial technology, this material has been gradually used in medicine, construction and other industries. [0003] The process of softening high-stre...
Claims
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IPC IPC(8): C22C38/04C22C38/02C22C38/44C22C38/46C22C38/42C22C38/34C21D1/32
CPCC21D1/32C21D2211/004C21D2211/005C22C38/02C22C38/04C22C38/34C22C38/42C22C38/44C22C38/46
Inventor 王洪利吴铖川杜思敏罗祥华
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD