CN103614679A - Method for strengthening and toughening zirconium and zirconium alloys - Google Patents
Method for strengthening and toughening zirconium and zirconium alloys Download PDFInfo
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- CN103614679A CN103614679A CN201310642473.7A CN201310642473A CN103614679A CN 103614679 A CN103614679 A CN 103614679A CN 201310642473 A CN201310642473 A CN 201310642473A CN 103614679 A CN103614679 A CN 103614679A
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- zirconium
- toughening
- strengthening
- alloys
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- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 229910052726 zirconium Inorganic materials 0.000 title claims abstract description 23
- 229910001093 Zr alloy Inorganic materials 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000005728 strengthening Methods 0.000 title claims abstract 6
- 239000002826 coolant Substances 0.000 claims abstract 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 239000001307 helium Substances 0.000 claims description 2
- 229910052734 helium Inorganic materials 0.000 claims description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 description 9
- 239000000956 alloy Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
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Abstract
一种锆及锆合金强韧化方法，其主要是：将Zr1～Zr5系列的锆及锆合金工件，置于装有超低温冷却介质的低温槽中保温12～48小时，而后自然升温至室温。本发明操作简单，成本低；特别适合那些已经成形加工完成的产品构件，或精加工完成的工件。A method for strengthening and toughening zirconium and zirconium alloys, which mainly comprises: placing zirconium and zirconium alloy workpieces of Zr1-Zr5 series in a low-temperature tank equipped with an ultra-low temperature cooling medium for 12-48 hours, and then naturally raising the temperature to room temperature. The invention is simple in operation and low in cost; it is especially suitable for those product components that have been shaped and processed, or workpieces that have been finished with finishing.
Description
Technical field:
The present invention relates to a kind of zirconium and zirconium alloy method for toughening, particularly completed the method for toughening of be shaped processing or accurately machined zirconium and zirconium alloy member.
Background technology:
Industrial pure zirconium and alloy thereof are the important structure materials of nuclear industry, are also outstanding chemical industry corrosion resistance structure materials simultaneously.Under zirconium and zirconium alloy room temperature, be close-packed hexagonal type α phase constitution, the room temperature tensile strength of its annealed state is 380MPa, yield strength 205MPa, and unit elongation is greater than 16%.The methods such as general grain refining or working hardening are all applicable to this type of alloy.Yet aforesaid method, when improving zirconium and zirconium alloy intensity, all can be lost its part plasticity.Meanwhile, for those, complete be shaped processing or accurately machined member, for guaranteeing dimensional precision, can not adopt these methods further to strengthen.
Summary of the invention:
The object of the present invention is to provide and a kind ofly can after zirconium and zirconium alloy product complete be shaped processing or precision work, improve its yield strength and tensile strength plasticity remains unchanged zirconium and zirconium alloy method for toughening simultaneously.
The present invention is placed in zirconium and zirconium alloy under ultra-low temperature surroundings, to carry out sub-zero treatment, and then reaches and improve zirconium and zirconium alloy intensity makes it highly malleablized, the object that simultaneously keeps plasticity not decline.
Concrete technical scheme of the present invention is: by zirconium and the zirconium alloy workpiece of Zr1～Zr5 trade mark (GB/T8767-1988) series, preferably structural state is for returning state, be placed in the cryostat, that the cooling dielectric fluid nitrogen of very low temperature or liquid helium be housed and be incubated 12～48 hours, then naturally heat up and make room temperature.
Above-mentioned processing method principle is: very low temperature sub-zero treatment meeting causes that zirconium and zirconium alloy are because of volumetric shrinkage, and then introduces the dislocation of some amount, causes its matrix hardness to increase; These dislocations that prestore, in tensile deformation process subsequently, cause strength enhancing with newly-generated dislocation interaction, keep higher tension strain cementation index simultaneously, and then obtain high unit elongation.In addition, this sub-zero treatment also causes that grain orientation is tending towards preferred orientation, and it has certain effect to the improvement of zirconium and zirconium alloy bulk strength and plasticity also tool.
The present invention compares tool with existing various method for toughening and has the following advantages:
1, simple to operate, cost is low.
2, be particularly suitable for the product members that those have been shaped and have machined, or the workpiece that completes of precision work.
Accompanying drawing explanation:
Fig. 1 is the figure of tissue topography of Zr1 alloy annealed state.
Fig. 2 is the Hardness Distribution characteristic pattern before the sub-zero treatment of Zr1 alloy.
Fig. 3 is the Hardness Distribution characteristic pattern after the sub-zero treatment of Zr1 alloy.
Fig. 4 is the grain orientation variation diagram before the sub-zero treatment of Zr1 alloy.
Fig. 5 is the grain orientation variation diagram after the sub-zero treatment of Zr1 alloy.
Fig. 6 is the tensile property comparison diagram before and after the sub-zero treatment of Zr1 alloy.
Embodiment:
The Zr1 alloy that is 3mm by thickness, its structural state is annealed state, as shown in Figure 1, is placed in the cryostat, that liquid nitrogen is housed, liquid nitrogen surface will be incubated after 24 hours higher than processed workpiece, takes out nature and is warming up to room temperature.Then detect, from Fig. 2 and Fig. 3, process the Hardness Distribution contrast of front and back, sub-zero treatment has improved the hardness of matrix.Before and after processing from Fig. 4 and Fig. 5, grain orientation variation diagram can be found out, the rotation of <0001> preferred orientation occurs crystal grain.From Fig. 6, processing the tensile property comparison diagram of front and back can find out, tensile yield and tensile strength after processing are all improved, and keeps higher unit elongation.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310642473.7A CN103614679A (en) | 2013-12-03 | 2013-12-03 | Method for strengthening and toughening zirconium and zirconium alloys |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310642473.7A CN103614679A (en) | 2013-12-03 | 2013-12-03 | Method for strengthening and toughening zirconium and zirconium alloys |
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| Publication Number | Publication Date |
|---|---|
| CN103614679A true CN103614679A (en) | 2014-03-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310642473.7A Pending CN103614679A (en) | 2013-12-03 | 2013-12-03 | Method for strengthening and toughening zirconium and zirconium alloys |
Country Status (1)
| Country | Link |
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| CN (1) | CN103614679A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1032073A (en) * | 1987-07-27 | 1989-03-29 | 低温学国际公司 | A kind of apparatus and method that are used for multiple material is carried out sub-zero treatment |
| CN201183810Y (en) * | 2008-02-15 | 2009-01-21 | 王绍钢 | Ultra low temperature deep cold treatment apparatus |
| CN101824585A (en) * | 2010-05-14 | 2010-09-08 | 江苏大学 | Cold treatment method for preparing high-toughness metal-base composite material |
-
2013
- 2013-12-03 CN CN201310642473.7A patent/CN103614679A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1032073A (en) * | 1987-07-27 | 1989-03-29 | 低温学国际公司 | A kind of apparatus and method that are used for multiple material is carried out sub-zero treatment |
| CN201183810Y (en) * | 2008-02-15 | 2009-01-21 | 王绍钢 | Ultra low temperature deep cold treatment apparatus |
| CN101824585A (en) * | 2010-05-14 | 2010-09-08 | 江苏大学 | Cold treatment method for preparing high-toughness metal-base composite material |
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Application publication date: 20140305 |