A kind of Zr-2.5nb alloy bar and extrusion processing method thereof

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-2.5Nb 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...

Examples

Embodiment 1

[0026] The invention provides a method for extrusion processing of Zr-2.5Nb 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-...

Embodiment 2

[0040] The present invention also provides a method for extrusion processing of Zr-2.5Nb 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 with 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-2.5Nb 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 with Figure 4 , the grain size rating of the obtained Zr-2.5Nb alloy rod is 13 grades.

technical field

[0001] The invention belongs to the technical field of zirconium alloy processing, and in particular relates to a Zr-2.5Nb 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...

Examples

Embodiment 1

[0026] The invention provides a method for extrusion processing of Zr-2.5Nb 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-...

Embodiment 2

[0040] The present invention also provides a method for extrusion processing of Zr-2.5Nb 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 with 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-2.5Nb 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 with Figure 4 , the grain size rating of the obtained Zr-2.5Nb alloy rod is 13 grades.

Images