Fine grain strengthening method of invar alloy strip material

A fine-grain strengthening technology for Invar alloys, which is applied in the field of fine-grain strengthening of Invar alloy strips, can solve the problems of difficult to achieve fine grain structure of Invar alloys, low deformation energy storage, small dislocation and defect density, etc. problem, to achieve the effect of large deformation energy storage, low production cost, high hardness and strength

Inactive Publication Date: 2017-09-01
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When the Invar alloy strip is produced by conventional cold rolling, the deformation dislocation is prone to dynamic recovery during the cold rolling process, the dislocation and defect density are small, the deformation energy storage is low, and it is difficult to achieve the crystallization of the Invar alloy after annealing granular tissue refinement

Method used

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  • Fine grain strengthening method of invar alloy strip material
  • Fine grain strengthening method of invar alloy strip material
  • Fine grain strengthening method of invar alloy strip material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The plate is soaked in liquid nitrogen to keep warm for 10 to 15 minutes. After taking it out, it is quickly rolled by a four-roll cold rolling mill. The rolling temperature is -100 to -150°C and the rolling speed is 0.06m / s. The force is 400kN, and the reduction rate of each pass is not more than 15%. After the end of each pass, quickly soak the rolled piece in liquid nitrogen, keep it warm for 10 to 15 minutes, and cycle the above rolling process. After 21 passes of deep cold rolling, the total reduction rate is 90%, and the Invar alloy strip with a thickness of 0.5mm is rolled from a 5mm thick plate.

[0029] The Invar alloy strip obtained by cryogenic rolling is put into a resistance furnace and heated to 550° C., and kept for 30 minutes. The average grain size of the Invar alloy strip obtained in this project is 3.9 μm, and the optical micrograph of the microstructure is as follows figure 1 As shown, the tensile strength is 550MPa and the elongation is 35%.

Embodiment 2

[0031] The treated hot-rolled plate is soaked in liquid nitrogen to keep warm for 10-15 minutes. After taking it out, it is quickly rolled by a four-roll cold rolling mill. The rolling temperature is -100-150°C, and the rolling speed of the rolling mill is 0.05m / s, the rolling force is 400kN, and the reduction rate of each pass is not more than 15%. After the end of each pass, quickly soak the rolled piece in liquid nitrogen, keep it warm for 10 to 15 minutes, and cycle the above rolling process. After 22 passes of cryogenic rolling, the total reduction rate is 90%, and the Invar alloy strip with a thickness of 0.4mm is rolled from a 4mm thick plate.

[0032] Put the Invar alloy strip obtained by cryogenic rolling into a resistance furnace and heat it to 560° C., and keep it warm for 30 minutes. The average grain size of the Invar alloy strip obtained in this project is 4.2 μm, and the optical micrograph of the microstructure is as follows figure 2 As shown, the tensile st...

Embodiment 3

[0034] The treated hot-rolled sheet is soaked in liquid nitrogen to keep warm for 10-15 minutes. After taking it out, it is quickly rolled with a four-roll cold rolling mill. The rolling temperature is -100--150°C, and the rolling speed of the rolling mill is 0.06m. / s, the rolling force is 400kN, and the reduction rate of each pass is not more than 15%. After the end of each pass, quickly soak the rolled piece in liquid nitrogen, keep it warm for 10 to 15 minutes, and cycle the above rolling process. After 24 passes of deep cold rolling, the total reduction rate is 90%, and the Invar alloy strip with a thickness of 0.45mm is rolled from a 4.6mm thick plate.

[0035] The Invar alloy strip obtained by cryogenic rolling is put into a resistance furnace and heated to 600° C., and kept for 10 minutes. The average grain size of the Invar alloy strip obtained in this project is 6 μm, and the optical micrograph of the microstructure is as follows image 3 As shown, the tensile stre...

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Abstract

The invention discloses a fine grain strengthening method of an invar alloy thin strip. Invar alloy comprises the chemical ingredients of, in percentage by mass, 36% of Ni, 0.01-0.1% of C, 0.01-0.04% of Si, 0.01-0.05% of Mn, less than 0.01% of P, less than 0.01% of S and the balance Fe. A preparation process comprises the steps of smelting, casting, hot rolling, solid solution treatment, deep-cooling rolling, low-temperature recrystallization and annealing and the like. The average grain size of the prepared invar alloy thin strip is 3.9-6 microns, the strength of extension is 510-550 MPa, and the elongation percentage is 35-37%. According to the fine grain strengthening method, the ingredients of the invar alloy thin strip do not need to be changed, process control is simple, and the cost is low. By means of the fine grain strengthening method, the technical problems that the invar alloy thin strip produced through an existing process is thick and large in grain size and poor in mechanical property are solved, the cost is low, pollution is avoided, and it is beneficial to development of the high-strength invar alloy thin strip.

Description

technical field [0001] The invention belongs to the technical field of metallurgical materials, and relates to a fine-grain strengthening method for Invar alloy strips. Background technique [0002] Invar alloy has a face-centered cubic structure and can maintain a single austenite structure at low temperatures. Invar alloy has excellent low expansion properties, and the average linear expansion coefficient in the range of 20-100 °C is only 1.5×10 -6 / °C. At present, Invar alloys are widely used in many fields such as natural gas storage tanks, shadow mask materials, aerospace, shipbuilding and precision instruments. [0003] The tensile strength of Invar alloy is low, about 500MPa. With the development of technology, more and more Invar alloys are used as structural materials, and improving the tensile strength of Invar alloys is an important research topic. Conventional strengthening methods for metal materials include solid solution strengthening, fine grain strengthe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/08C22C38/02C22C38/04C21D8/02C21D1/26
CPCC21D1/26C21D8/0226C21D8/0273C21D2211/001C22C38/004C22C38/02C22C38/04C22C38/08
Inventor 李长生郑建军樊子铭贺帅
Owner NORTHEASTERN UNIV
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