Superplastic forming nanocrystalline antibacterial martensitic stainless steel and preparation method thereof

A martensitic stainless steel and nanocrystalline technology, applied in the field of materials, can solve the problems of reduced thermal processing performance of materials, increase of thermal processing costs of materials, small size of prepared materials, etc., to achieve improved thermal forming performance, best comprehensive mechanical properties, excellent The effect of antimicrobial properties

CN113174544AActive Publication Date: 2021-07-27INST OF METAL RESEARCH - CHINESE ACAD OF SCI
8 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2021-07-27

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention relates to the technical field of materials, and discloses superplastic forming nanocrystalline antibacterial martensitic stainless steel and a preparation method thereof. The superplastic forming nanocrystalline antibacterial martensitic stainless steel is characterized by being prepared from the following chemical components in percentage, by weight, 0.16 to 0.32 of C; 12.8 to 14.4 of Cr; 1.4 to 3.0 of Cu; 1.2 to 2.8 of W; 0.04 to 0.20 of V; 0.01 to 0.03 of La; Mn is less than 0.15; N is less than 0.03; and the balance Fe. The preparation method of the stainless steel comprises the following steps of (1) preserving heat at 980-1060 DEG C for a period of time, and then quickly cooling to room temperature; (2) carrying out thermal deformation within the temperature of 820-900 DEG C and the strain rate of 0.1-1s <-1 >, and converting the nanolath precursor into an equiaxial nanocrystal structure, wherein the total strain capacity is greater than or equal to 70%; (3) carrying out superplastic forming under the conditions that the temperature is 760-840 DEG C and the strain rate of 0.001-0.02 s <-1 >; and (4) aging the material subjected to superplastic forming at the temperature of 460-500 DEG C for 3-5 hours. The prepared superplastic forming nanocrystalline antibacterial martensitic stainless steel has excellent hot working performance, corrosion resistance, antibacterial performance and comprehensive mechanical performance, and can be widely applied to medical instruments in the cutting fields of knives, scissors and the like.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to the technical field of materials, in particular to a superplastic formed nanocrystalline antibacterial martensitic stainless steel and a preparation method thereof. Background technique

[0002] Copper-containing antibacterial martensitic stainless steel is to add Cu element with broad-spectrum antibacterial function to traditional martensitic stainless steel, and use the Cu ions released continuously during the contact with the medium solution environment to participate in the killing process of bacteria. Applying copper-containing antibacterial martensitic stainless steel to the preparation of cutting medical instruments such as scalpels and surgical scissors is expected to significantly reduce the risk of bacterial infection during surgery. However, the copper-containing antibacterial martensitic stainless steel has also exposed the following two deficiencies in the actual use process: first, the addition of Cu leads to a si...

Examples

Embodiment

[0030] Embodiment: Examples 1 to 9 are stainless steels smelted according to the chemical composition range provided by the present invention, and the content of C, Cr, Cu, W, V elements is gradually increased, and the corresponding preparation process is also specified in the technical parameters of the present invention Make appropriate adjustments within the range. The size of the prepared bulk nanocrystalline metal material is 150×800×8 mm.