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Microalloying method for improving molybdenum and molybdenum alloy fusion welding line toughness by adding Zr

A micro-alloying, molybdenum alloy technology, applied in welding equipment, arc welding equipment, laser welding equipment and other directions, can solve the problems of restricting the application of molybdenum and molybdenum alloy, reduce large-sized pore defects, improve tensile strength, avoid The effect of grain boundary separation

Inactive Publication Date: 2017-07-14
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above problems seriously restrict the application of molybdenum and molybdenum alloys in the field of structural materials

Method used

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  • Microalloying method for improving molybdenum and molybdenum alloy fusion welding line toughness by adding Zr
  • Microalloying method for improving molybdenum and molybdenum alloy fusion welding line toughness by adding Zr
  • Microalloying method for improving molybdenum and molybdenum alloy fusion welding line toughness by adding Zr

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Effect test

Embodiment 1

[0046] With 0.25wt% La 2 o 3 The butt laser welding of high-performance molybdenum alloy thin-walled tube-end plug in dispersion-strengthened phase is taken as an example. The main operation process in the welding process is as follows: figure 1 As shown, the molybdenum tube and the end plug docking area are firstly polished with 240#, 600#, 1000# sandpaper, then alkaline washed with sodium hydroxide aqueous solution, and finally cleaned with acetone ultrasonically, dried for later use; the thickness is 0.05 mm zirconium foil is processed into a ring gasket with an outer diameter of 10mm and an inner diameter of 8.5mm, and is made of 12mL of HNO 3 With 6mL of HF+82mLH 2 The solution prepared by O was pickled to remove the oxide film on the surface of the zirconium foil, and finally ultrasonically cleaned with acetone and dried for later use. , as shown in Figure 2(b) and Figure 2(c); assemble the molybdenum tube and the end plug, and fill the joints of the zirconium foil ri...

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Abstract

The invention discloses a microalloying method for improving molybdenum and molybdenum alloy fusion welding line toughness by adding Zr. The microalloying method comprises the following steps: 1) an area to be welded of a workpiece to be welded is pretreated, wherein the workpiece to be welded adopts a material or pure molybdenum or a molybdenum alloy; 2) a zirconium layer or a zirconium foil is filled in the joint place of the workpiece to be welded; and then, the workpiece to be welded is assembled; 3) the workpiece to be welded is put in an inert protective atmosphere; and the area to be welded of the workpiece to be welded is preheated; and 4) a welding heat source is acted in a welding line of the workpiece to be welded to finish the fusion welding of the workpiece to be welded; and the welding line position of the workpiece to be welded is insulated, and is cooled to reach the room temperature to finish microalloying for improving the molybdenum and molybdenum alloy fusion welding line toughness by adding Zr. The method can eliminate the segregation phenomenon of impurity element grain boundary, and meanwhile, improves the molybdenum and molybdenum alloy fusion welding line strength.

Description

technical field [0001] The invention belongs to the technical field of welding, and relates to a microalloying method for improving the strength and toughness of molybdenum and molybdenum alloy welding seams by adding Zr. Background technique [0002] Molybdenum, with a melting point as high as 2610°C, has a small neutron absorption cross section, low thermal expansion coefficient, excellent thermal conductivity, good high-temperature mechanical properties, and good processability. When the temperature is lower than 500°C, molybdenum has good stability in air or water. The above advantages make molybdenum have important applications in metallurgy, aviation, aerospace, nuclear energy, military and other fields. However, molybdenum and molybdenum alloys are hard and brittle materials in nature, and their weldability is extremely poor. Because the melting point of molybdenum is too high, it must generally be processed and prepared by powder metallurgy, and the material has a h...

Claims

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Application Information

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IPC IPC(8): B23K26/21B23K26/60B23K26/348B23K15/00B23K10/02B23K9/16B23K9/235
CPCB23K9/16B23K9/235B23K10/02B23K15/0046B23K26/21B23K26/348B23K26/60
Inventor 张林杰宁杰白清林杨健楠孙院军安耿朱琦李思功龚星李锐任啟森刘彤
Owner XI AN JIAOTONG UNIV
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