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Method for judging laser welding strength of heat-treatment-improved martensitic aged steel belt

A maraging steel, laser welding technology, applied in the direction of testing the hardness of materials, can solve the problem of inability to use the hardness distribution and change of the weld area to judge the tensile strength, etc. Efficient effect

Active Publication Date: 2013-10-30
DUNHUA BAITE TECH
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Problems solved by technology

[0005] The invention discloses a method for judging the improvement of the welding strength of a maraging steel strip by post-weld heat treatment, which solves the current limitation that the tensile strength cannot be judged by changes in the hardness distribution of the weld area, and aims to evaluate the effect of post-weld heat treatment on the tensile strength A new way to influence effects

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  • Method for judging laser welding strength of heat-treatment-improved martensitic aged steel belt
  • Method for judging laser welding strength of heat-treatment-improved martensitic aged steel belt

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Embodiment 1

[0037] The original base material is Fe-Cr-Ni maraging steel strip, the chemical composition is 0.050%C-13.62%Cr-6.82%Ni-1.43%Si-0.19%Co-0.76%Mo-0.34%Ti-0.76 %Cu with a thickness of 3.0 mm. After 420℃ / 1 hour / air cooling aging treatment, the hardness is 460 HV. Using CO 2 Laser for butt welding, process parameters: power 3kW, welding speed 2.0m / min, spot diameter 0.6mm, focus on the processing surface, shielding gas is Ar and He, flow Ar: 1.05 m3 / h+He: 0.45 m3 / h.

[0038] See attached figure 1It is the organization of the welded joint, the middle is the fusion zone, the two sides are the heat-affected zone, and the outermost is the unaffected base metal zone.

[0039] attached figure 2 It is the hardness distribution of the weld zone, the base metal zone 1, 5, the heat affected zone 2, 4, and the fusion zone 3.

[0040] In the temperature range of 420-580 ° C, after 2 hours of aging treatment, the hardness of each area at different temperatures is shown in Table 1, and R...

Embodiment 2

[0049] The original base metal is a Fe-Ni maraging steel strip with a thickness of 4.0mm, and its chemical composition is 0.01%C-18.1%Ni-8.3%Co-4.6%Mo-0.43%Ti-0.15%Al. After solution treatment at 800°C, the hardness is 460HV. Using CO 2 The laser is used for butt welding, and the process parameters are: power 3.5kW, welding speed 2.0mm / min, spot diameter 0.6mm, focus 1.6mm below the processing surface, shielding gas He, and flow rate 1.8 m3 / h. After aging treatment at 480°C for 3 hours, the hardness of each area is shown in Table 3, and R is also given in the table. F , R I Calculate values, predict break locations and improve performance.

[0050] Table 3 Improvement effect of hardness, predicted fracture location and tensile strength of Fe-Ni maraging steel welds in different heat treatment states

[0051] testing sample Processing temperature ( o c) Fusion Zone Hardness (HV) Heat affected zone hardness (HV) Base metal zone hardness (HV) R F predic...

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Abstract

The invention discloses a method for judging the laser welding strength of a postweld-heat-treatment-improved martensitic aged steel belt. A rupture position is judged by measuring the hardness distribution of different postweld heat treatment weld joint areas and taking the hardness rate of a heat affected area to a base metal area as a parameter, and the improvement effect of postweld heat treatment on the welding strength is evaluated by taking the hardness rate of the judged rupture position area to the primary martensitic base material as the parameter, so a practical postweld heat treatment process is selected, and the problem that the postweld heat treatment process needs to be selected through a tension test in the prior art is solved. The method can be realized only through a few hardness measuring samples, and by the method, the test efficiency is high, the used samples are few, and the test cost is reduced.

Description

technical field [0001] The invention discloses a method for judging the improvement of the welding strength of a maraging steel strip by post-welding heat treatment, and relates to a method for judging the tensile strength of a laser-welded joint of ultra-high-strength maraging steel by post-welding heat treatment, and belongs to the technical field of metal heat treatment. Background technique [0002] Maraging steel is a kind of ultra-low carbon high alloy steel developed after 1960. This type of steel combines ultra-high strength and high toughness, and has good forming and welding properties. Therefore, it is mainly used in military, aerospace, electric power and other fields. To distinguish from the composition of alloy elements, there are mainly two types, one is Fe-Ni alloy system (Ni content is 18%, Co content is 8-13%), and the other is Fe-Cr-Ni alloy system (Cr The content is 10.2-16%, and the Ni content is 3.9-10.8%). In addition, steel usually contains alloying ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/40
Inventor 郭西强安健陆有管玉昌刘海园王渊博郜晓溪李超刘向飞
Owner DUNHUA BAITE TECH