A kind of multi-angle grain boundary pure iron material and preparation method thereof
A multi-angle, pure iron technology, applied in the field of metal materials, can solve the problems of pure iron materials such as low strength, low hardness performance, limited tissue adjustment, and general effect, achieve process stability and repeatability, prevent residual internal stress, The effect of high-precision component control
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[0020] The invention provides a method for preparing a multi-angle grain boundary pure iron material, comprising the following steps:
[0021] The as-cast pure iron bar is subjected to pretreatment, plastic deformation treatment and stress relief treatment in sequence to obtain a primary pure iron material; the surface roughness of the primary pure iron material is ≤ 0.8 μm, and the transverse strain rate of the material obtained after plastic deformation treatment is ≥30%;
[0022] The primary pure iron material is sequentially subjected to two-dimensional extensional deformation treatment and quenching treatment to obtain the multi-angle grain boundary pure iron material.
[0023] In the invention, the as-cast pure iron bar is subjected to pretreatment, plastic deformation treatment and stress relief treatment in sequence to obtain the primary pure iron material.
[0024] The present invention has no special limitation on the acquisition method of the as-cast pure iron bar ...
Embodiment 1
[0035] The as-cast pure iron bar is subjected to derusting treatment and anti-oxidation treatment in sequence in a spray-baking integrated device. Among them, the particle source in the derusting treatment is carbon monoxide plasma, the power supply is 2.6 kilowatts, and the derusting treatment time is 12 minutes; the anti-oxidation treatment The baking steam in the treatment is potassium hydroxide steam, the temperature is 710°C, and the time is 6 minutes, and the primary pure iron material is obtained;
[0036]The obtained primary pure iron material is placed in a two-way high-pressure torsion and induction recovery system for plastic deformation and stress relief treatment. The torsional force is 800MPa, the reverse torsion period is 36s, the torsion rate is 7rpm, and the induction heating temperature is 780°C. The heating time is 6s, and the interval between two heatings is 2s to obtain a billet; the obtained billet is subjected to two-dimensional extension and deformation ...
Embodiment 2
[0038] The as-cast pure iron bar is subjected to derusting treatment and anti-oxidation treatment in sequence in a spray-baking integrated device. Among them, the particle source in the derusting treatment is carbon monoxide plasma, the power supply is 2.8 kilowatts, and the derusting treatment time is 18 minutes; the anti-oxidation treatment The baking steam in the treatment is potassium hydroxide steam, the temperature is 720°C, and the time is 8 minutes to obtain the primary pure iron material;
[0039] The obtained primary pure iron material is placed in a two-way high-pressure torsion and induction recovery system for plastic deformation and stress relief treatment. The torsion force is 840MPa, the reverse torsion period is 37s, the torsion rate is 7rpm, and the induction heating temperature is 790°C. The heating time is 7s, and the interval between two heatings is 2s to obtain the billet; the obtained billet is subjected to two-dimensional extension and deformation treatm...
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