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Co-rich nanoparticle reinforced ferritic stainless steel and preparation method thereof
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A nanoparticle and ferrite technology, applied in the field of ferritic stainless steel, can solve the problems of low strength and complex process, and achieve the effect of improving strength and plasticity
Active Publication Date: 2022-05-27
XIAMEN UNIV
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[0006] So far, related patents on ferritic stainless steel mainly improve the performance of ferritic stainless steel by improving the preparation process and heat treatment process, but the process is often more complicated and its relatively low strength
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Embodiment 1
[0033] (1) According to the design composition: 72.1wt.%Fe and inevitable impurities, 20wt.%Cr, 5wt.%Co, 1.9wt%Si, 1wt.%Ti, weighing and batching;
[0036](4) Divide the sheet obtained in step (3) into three parts, perform aging treatment at 600° C. for 4h, 6h, and 12h respectively, and then cool it in an air atmosphere, that is, to obtain the Co-rich nanoparticles reinforced with different aging conditions Type ferritic stainless steel.
[0037] like figure 1 As shown, the Co-rich nanoparticle-enhanced ferritic stainless steel prepared in Example 1 precipitates dispersed and distributed nano-scale Co-rich particles from the ferrite matrix after aging, and is highly coherently oriented with the matrix.
[0038] like figure 2 As shown, the strength and plasticity of the Co-rich nanoparticle-strengthened ferr...
Embodiment 2
[0041] (1) According to the design composition: 70wt.%Fe and inevitable impurities, 22wt.%Cr, 5.4wt.%Co, 1.8wt%Si, 0.8wt.%Nb, weigh and batch;
[0043] (3) The alloy ingot is cold-rolled into a plate after solution treatment at 1200°C;
[0044] (4) After the plate obtained in step (3) is aged at 650° C. for 4 hours, and then cooled in an air atmosphere, the Co-rich nanoparticle-enhanced ferritic stainless steel is prepared.
[0045] The Co-rich nanoparticle-enhanced ferritic stainless steel prepared in Example 2 has a tensile strength of 1120 MPa at room temperature, an elongation of 8%, and a microhardness of 443HV, which is 103HV higher than that in the unaged state. .
Embodiment 3
[0047] (1) According to the design composition: 70.5wt.%Fe and inevitable impurities, 21.5wt.%Cr, 4.5wt.%Co, 1.5wt%Si, 2wt.%Ta, weigh and batch;
[0049] (3) The alloy ingot is cold-rolled into a plate after solution treatment at 1300 °C;
[0050] (4) After the sheet obtained in step (3) is aged at 600° C. for 12 hours, it is cooled in an air atmosphere to obtain the Co-enriched nanoparticle-enhanced ferritic stainless steel.
[0051] The Co-rich nanoparticle reinforced ferritic stainless steel prepared in Example 3 has a tensile strength of 1070MPa at room temperature, an elongation of 8%, a microhardness of 426HV, and a microhardness increased by 95HV compared to the unaged state. .
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Abstract
The invention relates to the field of ferritic stainless steel, and discloses Co-rich nanoparticle reinforced ferritic stainless steel and a preparation method thereof. The Co-rich nano-particle reinforced ferritic stainless steel comprises the following components: 70-74 wt.% of Fe and 20-24 wt.% of Cr as matrix elements, and further comprises alloying elements Co and Si as well as at least one of alloying elements Zr, Hf, Ti, Nb and Ta. The preparation method comprises the following steps: (1) weighing and proportioning according to the designed components; (2) smelting in a vacuum arcsmelting furnace to obtain an alloyingot; (3) carrying out solution treatment at the temperature of 1100-1400 DEG C, and then carrying out cold rolling to obtain a plate; and (4) aging treatment is conducted at the temperature of 450-650 DEG C for not less than 30 min, and then cooling is conducted in the air atmosphere. In the aging process, nanoscale Co-rich particles which are distributed in a dispersed mode and are in high coherent orientation with a matrix are separated out, the strength and plasticity of the prepared ferritic stainless steel can be remarkably improved at the same time, the tensile strength at the room temperature can reach 1400 MPa to the maximum degree, and the ductility can reach 10% to the maximum degree.
Description
technical field [0001] The invention relates to the field of ferritic stainless steel, in particular to a Co-rich nanoparticle reinforced ferritic stainless steel and a preparation method thereof. Background technique [0002] Ferritic stainless steel is widely used in automobile, marine engineering, oil and gas exploration and nuclear industry due to its high thermal conductivity, small thermal expansion coefficient, good oxidation resistance, excellent stress corrosion resistance and easy processing and forming. The main elements of ferritic stainless steel are Fe and Cr and generally do not contain Ni, making it cheaper to manufacture than austenitic stainless steel, and in many applications where only austenitic stainless steel (300 series) was used , ferritic stainless steel has proven to be an excellent alternative material. The corrosion resistance of ferritic stainless steel can be ensured by increasing the content of Cr element in the alloy, but in the long-term se...
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