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A kind of preparation method of high-strength vermicular graphite cast iron plate

A technology of vermicular graphite cast iron and plate, which is applied in the field of preparation of high-strength vermicular graphite iron plate, and achieves the effects of simple process operation, obvious strengthening effect and cost reduction.

Active Publication Date: 2019-04-30
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the problem of embrittlement of vermicular graphite cast iron plates by traditional normalizing process, the present invention provides a preparation method of high-strength vermicular graphite cast iron plates. The traditional normalizing process can strengthen the compacted graphite cast iron plate and avoid its embrittlement

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  • A kind of preparation method of high-strength vermicular graphite cast iron plate
  • A kind of preparation method of high-strength vermicular graphite cast iron plate

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Embodiment 1

[0027] In this embodiment, heat treatment is carried out to the as-cast RuT300 thin plate of 100mm * 28mm * 8mm (length * width * thickness), and the heat treatment process is as follows:

[0028] First, heat a 100mm×28mm×8mm thick as-cast RuT300 sheet to 960°C and keep it warm for 1h.

[0029] Second, take out the sheet sample and air cool to 600°C.

[0030] Thirdly, put the sheet into a furnace preheated to 600°C, and keep it warm at 600°C for 5 minutes.

[0031] Fourth, after the heat preservation is over, take out the sheet and cool it to room temperature in air.

[0032] figure 2 is the engineering stress-strain curve of the isothermal normalizing state RuT300 thin plate of the present invention; the tensile strength of the vermicular graphite cast iron thin plate after adopting the isothermal normalizing heat treatment process of the present invention is 493MPa, and the elongation after fracture is 0.975%.

[0033] It can be seen that compared with the traditional no...

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Abstract

The invention discloses a preparation method of a high-strength vermicular graphite cast iron panel, and belongs to the technical field of metallic materials. The preparation method comprises the steps that firstly, a cast vermicular graphite cast iron sample is subjected to austenitizing treatment, and then, the cast vermicular graphite cast iron sample is quickly cooled to the upper limit of upper bainite transformation temperature; the cast vermicular graphite cast iron sample is put into a furnace of the temperature interval to be subjected to heat preservation, heat preservation time depends on components and size of the sample, and the operation is aimed at promoting austenite to quickly transform to pearlite and inhibiting formation of ferrite; and after heat preservation, the sample is subjected to air cooling to the room temperature, and the high-strength vermicular graphite cast iron panel is obtained. According to the preparation method, the obvious embrittlement phenomenon caused by a traditional normalizing treatment technology is solved, strength of vermicular graphite cast iron can be obviously improved, and vermicular graphite cast iron maintains certain elongation.

Description

technical field [0001] The invention relates to the technical field of metal material preparation, in particular to a method for preparing a high-strength vermicular graphite cast iron plate. Background technique [0002] Among the strengthening and toughening methods of metal materials, heat treatment is the most commonly used and very important method. For as-cast vermicular graphite iron, proper heat treatment process can also improve its mechanical properties by changing its microstructure, such as normalizing heat treatment can improve the strength of vermicular graphite cast iron, and annealing heat treatment can improve the ductility of vermicular graphite cast iron etc., so as to expand its scope of engineering application. [0003] At present, the traditional heat treatment process of vermicular graphite cast iron mainly includes quenching, normalizing, annealing and tempering processes. These heat treatment processes and their combined applications can meet most ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D5/00C21D1/28C21D9/00
CPCC21D1/28C21D5/00C21D9/0081
Inventor 庞建超邱宇张哲峰李守新
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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