Zr-Nb alloy bar material and extruding and processing method thereof

A technology of alloy bar and extrusion processing, which is applied in the field of zirconium alloy processing, can solve the problems of easy flow of metal, difficult grain size of structure to meet the requirement of refinement degree, uneven structure, etc., to achieve uniform structure and reduce uneven wear , the effect of improving the service life

Active Publication Date: 2019-04-30
西部超导材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the free forging deformation, there are few compressive stress directions of the alloy, but zirconium and its alloys have good deformation plasticity. When the free forging process is used, the metal is easy to flow, resulting in uneven structure, and the grain size of the structure is difficult to reach the Zr- 2.5Nb alloy grain refinement requirements; when the extrusion process is used, due to the influence of three-dimensional compressive stress on the material, the degree of structure fragmentation is strong, and it is easier to obtain a fine and uniform structure, but in the Zr-2.5Nb alloy extrusion production On the one hand, how to set up a reasonable extrusion process to obtain alloy rods that meet the requirements of biomedical grain size and structure uniformity has become one of the key technologies for the preparation of Zr-2.5Nb alloys

Method used

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  • Zr-Nb alloy bar material and extruding and processing method thereof
  • Zr-Nb alloy bar material and extruding and processing method thereof
  • Zr-Nb alloy bar material and extruding and processing method thereof

Examples

Experimental program
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Embodiment 1

[0026] The invention provides a method for extrusion processing of Zr-Nb alloy rods, comprising the following steps:

[0027] (1) pretreatment, wrapping lubricating film outside the Zr-2.5Nb blank without surface defects, to obtain the Zr-2.5Nb blank after pretreatment;

[0028] (2) heating, the Zr-2.5Nb billet after pretreatment is heated to extruding temperature and insulation;

[0029] (3) Extruding, extruding the heated Zr-2.5Nb billet according to a preset extrusion ratio to obtain Zr-2.5Nb alloy rods of target specifications.

[0030] Further, the lubricating film in the step 1 is a copper film or a low carbon steel film.

[0031] Further, the thickness of the lubricating film in the step 1 is 0.5mm-2mm.

[0032] Further, the extrusion temperature in the step 2 is 600°C-750°C.

[0033] Further, the heat preservation time in the step 2 is 60min-180min.

[0034] Further, the preset extrusion ratio in step 3 is 6-15, and the extrusion ratio is the ratio of the cross-sec...

Embodiment 2

[0040] The present invention also provides a method for extrusion processing of Zr-Nb alloy rods, comprising the following steps:

[0041] (1) Select a Φ175mm Zr-2.5Nb billet, and wrap a lubricating film with a thickness of 0.5 to 2 mm on the outside of the billet with a low-carbon steel coil;

[0042] (2) Heating the pretreated Zr-2.5Nb billet obtained in step 1 to 680°C and keeping it warm for 180min;

[0043] (3) Extrude the Zr-2.5Nb billet heated in step 2 with an extrusion ratio of 6 to obtain a Zr-2.5Nb alloy rod with a target specification of Φ70 mm.

[0044] In Example 2, Zr-2.5Nb alloy rods with a size of Φ70mm were obtained by first-fire extrusion at a heating temperature of 680°C and an extrusion ratio of 6. The structure is fine and uniform, see figure 1 and figure 2 , the grain size rating of the obtained Zr-2.5Nb alloy rod is 12 grades.

Embodiment 3

[0046] The present invention also provides a method for extrusion processing of Zr-Nb alloy rods, comprising the following steps:

[0047] (1) Select a Φ165mmZr-2.5Nb billet, and use a low-carbon steel coil to wrap a 0.5-2mm thick lubricating film on the outside of the billet;

[0048] (2) Heating the pretreated Zr-2.5Nb billet obtained in step 1 to 600°C and keeping it warm for 120min;

[0049] (3) Extrude the Zr-2.5Nb billet heated in step 2 with an extrusion ratio of 10 to obtain a Zr-2.5Nb alloy rod with a target specification of Φ50 mm.

[0050] Example 3 The Φ50mm Zr-2.5Nb alloy rod obtained by first-fire extrusion at a heating temperature of 600°C and an extrusion ratio of 10 has a fine and uniform structure, see image 3 and Figure 4 , the grain size rating of the obtained Zr-2.5Nb alloy rod is 13 grades.

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Abstract

The invention belongs to the technical field of zirconium alloy processing, and particularly relates to a Zr-Nb alloy bar material and an extruding and processing method thereof. The extruding and processing method comprises the following steps of performing pretreatment: coating a lubricating film outside a Zr-2.5Nb semi-finished material free from surface defects, so as to obtain a pretreated Zr-2.5Nb semi-finished material; performing heating: heating the pretreated Zr-2.5Nb semi-finished material to an extruding temperature, and performing temperature insulating; and performing extruding:performing extruding on the heated Zr-2.5Nb semi-finished material according to a pre-set extrusion ratio, so as to obtain the Zr-Nb alloy bar material of target specification. According to the extruding and processing method disclosed by the invention, through the extruding temperature and the extrusion ratio, Zr-Nb alloy bar material tissues are controlled; the finally-obtained Zr-Nb alloy bar material is uniform and tiny in tissue, has 10 or more grain sizes; and when the Zr-Nb alloy bar material is transplanted and applied in human bodies, non-uniform wear can be effectively reduced, and then the service life is prolonged.

Description

technical field [0001] The invention belongs to the technical field of zirconium alloy processing, and in particular relates to a Zr-Nb alloy rod and an extrusion processing method thereof. Background technique [0002] Due to its good biocompatibility, wear resistance, low elastic modulus, and excellent corrosion resistance and wear resistance, Zr-2.5Nb alloy has been rapidly developed in the field of biomedicine and can be used to manufacture joints for human implants. Wait. Zr-2.5Nb alloys for biological implants have higher requirements on grain size, and generally require a grain size of not less than 10 grades and high structural uniformity. [0003] At present, in the field of zirconium and its alloy processing, the main production processes are mainly pipe extrusion and sheet rolling; however, there is no mature preparation for Zr-2.5Nb alloy rods that require high microstructure uniformity and high grain size. method. In the free forging deformation, there are fe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/00B21C23/21B21C23/32B21C29/00B21C31/00C22C16/00
CPCB21C23/002B21C23/217B21C23/32B21C29/003B21C31/00C22C16/00
Inventor 郑念庆和永岗侯峰起尚金金张晓园孙小平刘向宏
Owner 西部超导材料科技股份有限公司
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