Producing and processing technology of superplastic pure iron material

Abstract

The invention discloses a producing and processing technology of a superplastic pure iron material. The producing and processing technology comprises the following steps: (1) selecting a material: selecting a material which is produced in China and of which the type is CH1T as a base material; (2) performing drawing: drawing the material by a roller die drawing technique to obtain steel wires; and (3) performing annealing: using an isothermal recrystallization annealing technology, placing the steel wires in a heat treatment furnace, inflating the heat treatment furnace with inert gas, increasing the temperature in the heat treatment furnace to 660- 680 DEG C, keeping the temperature for 1- 2 hours, then performing cooling to 580-600 DEG C at a cooling rate of 15-20 DEG C / h keeping the temperature for 2-3 hours, and then performing cooling to room temperature at a cooling rate of 30-50 DEG C / h. The wire obtained by the processing of the producing and processing technology disclosed by the invention is high in plasticity, the wire does not crack after cold heading tests of deformation of 1 / 4 or above, and the wire has high elongation which is greater than or equal to 90%, ultra low hardness HV which is less than or equal to 90, refined grains with an average grain size level being greater than or equal to 11, uniform grain size, equiaxed grains and grain area difference being less than or equal to 5%.

Description

technical field

[0001] The invention relates to the technology in the field of wire rod production and processing, in particular to a production and processing technology of superplastic pure iron material. Background technique

[0002] In recent years, metal superplasticity has been widely used in the field of industrial production. Some superplastic alloys are playing an irreplaceable role in the production of aerospace and automotive parts, handicrafts, instrument shells and some complex shape components due to their excellent deformation properties and uniform materials. . At the same time, the variety and number of superplastic metals have also increased significantly.

[0003] Due to the rapid progress in superplasticity research, there has been a compelling application of aluminum alloys in the automotive industry. At the 8th International Conference on Superplasticity, automobile companies from Japan, Switzerland and other countries introduced large aluminum alloy...

Examples

Embodiment 1

[0025] (1) Material selection: The domestically produced model CH1T material is selected as the base material, the content of the alloy element Ti is controlled at 0.06%, the content of S and P is both 0.019%, and there is no non-metallic inclusions inside;

[0026] (2) Drawing: use roller die drawing technology to draw the material to obtain steel wire;

[0027] (3) Annealing: Using the isothermal recrystallization annealing process, place the steel wire in a heat treatment furnace, fill the heat treatment furnace with inert gas, then raise the temperature in the furnace to 680°C and keep it for 1.5h; then, heat it at 18°C Cool down to 580°C at a cooling rate of / h, and keep the temperature for 2h, and then return to normal temperature at a cooling rate of 40°C / h. The inert gas is methanol, and the flow rate of methanol gas is 2L / min.

Embodiment 2

[0029] (1) Material selection: The domestically produced CH1T material is selected as the base material, the alloy element Ti content is controlled at 0.12%, the S and P content are both below 0.018%, and there are no non-metallic inclusions inside;

[0030] (2) Drawing: use roller die drawing technology to draw the material to obtain steel wire;

[0031] (3) Annealing: Using the isothermal recrystallization annealing process, place the steel wire in a heat treatment furnace, fill the heat treatment furnace with inert gas, then raise the temperature in the furnace to 670 ° C, and keep it for 1 hour; then, at 15 ° C / Cool down to 600°C at a cooling rate of h, and keep the temperature for 2.5h, and then return to room temperature at a cooling rate of 50°C / h. The inert gas is methanol, and the flow rate of methanol gas is 2L / min.

Embodiment 3

[0033] (1) Material selection: The domestically produced CH1T material is selected as the base material, the alloy element Ti content is controlled at 0.10%, the S and P content are both 0.015%, and there are no non-metallic inclusions inside;

[0034] (2) Drawing: use roller die drawing technology to draw the material to obtain steel wire;

[0035] (3) Annealing: Using the isothermal recrystallization annealing process, place the steel wire in a heat treatment furnace, fill the heat treatment furnace with inert gas, then raise the temperature in the furnace to 660 ° C, and keep it for 2 hours; then, at 20 ° C / Cool down to 590°C at a cooling rate of h, and keep the temperature for 3h, and then return to room temperature at a cooling rate of 30°C / h. The inert gas is methanol, and the flow rate of methanol gas is 2L / min.

[0036] The products obtained after the treatment of the above-mentioned embodiments are inspected for spheroidization level, grain size, depth of decarburi...

technical field

[0001] The invention relates to the technology in the field of wire rod production and processing, in particular to a production and processing technology of superplastic pure iron material. Background technique

[0002] In recent years, metal superplasticity has been widely used in the field of industrial production. Some superplastic alloys are playing an irreplaceable role in the production of aerospace and automotive parts, handicrafts, instrument shells and some complex shape components due to their excellent deformation properties and uniform materials. . At the same time, the variety and number of superplastic metals have also increased significantly.

[0003] Due to the rapid progress in superplasticity research, there has been a compelling application of aluminum alloys in the automotive industry. At the 8th International Conference on Superplasticity, automobile companies from Japan, Switzerland and other countries introduced large aluminum alloy...

Examples

Embodiment 1

[0025] (1) Material selection: The domestically produced model CH1T material is selected as the base material, the content of the alloy element Ti is controlled at 0.06%, the content of S and P is both 0.019%, and there is no non-metallic inclusions inside;

[0026] (2) Drawing: use roller die drawing technology to draw the material to obtain steel wire;

[0027] (3) Annealing: Using the isothermal recrystallization annealing process, place the steel wire in a heat treatment furnace, fill the heat treatment furnace with inert gas, then raise the temperature in the furnace to 680°C and keep it for 1.5h; then, heat it at 18°C Cool down to 580°C at a cooling rate of / h, and keep the temperature for 2h, and then return to normal temperature at a cooling rate of 40°C / h. The inert gas is methanol, and the flow rate of methanol gas is 2L / min.

Embodiment 2

[0029] (1) Material selection: The domestically produced CH1T material is selected as the base material, the alloy element Ti content is controlled at 0.12%, the S and P content are both below 0.018%, and there are no non-metallic inclusions inside;

[0030] (2) Drawing: use roller die drawing technology to draw the material to obtain steel wire;

[0031] (3) Annealing: Using the isothermal recrystallization annealing process, place the steel wire in a heat treatment furnace, fill the heat treatment furnace with inert gas, then raise the temperature in the furnace to 670 ° C, and keep it for 1 hour; then, at 15 ° C / Cool down to 600°C at a cooling rate of h, and keep the temperature for 2.5h, and then return to room temperature at a cooling rate of 50°C / h. The inert gas is methanol, and the flow rate of methanol gas is 2L / min.

Embodiment 3

[0033] (1) Material selection: The domestically produced CH1T material is selected as the base material, the alloy element Ti content is controlled at 0.10%, the S and P content are both 0.015%, and there are no non-metallic inclusions inside;

[0034] (2) Drawing: use roller die drawing technology to draw the material to obtain steel wire;

[0035] (3) Annealing: Using the isothermal recrystallization annealing process, place the steel wire in a heat treatment furnace, fill the heat treatment furnace with inert gas, then raise the temperature in the furnace to 660 ° C, and keep it for 2 hours; then, at 20 ° C / Cool down to 590°C at a cooling rate of h, and keep the temperature for 3h, and then return to room temperature at a cooling rate of 30°C / h. The inert gas is methanol, and the flow rate of methanol gas is 2L / min.

[0036] The products obtained after the treatment of the above-mentioned embodiments are inspected for spheroidization level, grain size, depth of decarburi...

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