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Distribution optimization method of grain boundary characteristics based on friction stir processing of cupronickel alloy

A friction stir and distribution optimization technology, applied in the field of metal material deformation and heat treatment, to achieve the effect of optimizing the distribution of grain boundary characteristics, improving corrosion resistance, and optimizing grain boundary structure

Active Publication Date: 2022-06-17
JIANGSU OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing reports are all using friction stir processing technology to directly surface treat materials (refining grain size) or performing friction stir on different materials to prepare composite materials, but there is no use of friction stir processing technology combined with annealing heat treatment to optimize the material grain boundary Report of characteristic distribution; for this purpose, a distribution optimization method based on grain boundary characteristics of friction stir processed cupronickel alloys is provided

Method used

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  • Distribution optimization method of grain boundary characteristics based on friction stir processing of cupronickel alloy
  • Distribution optimization method of grain boundary characteristics based on friction stir processing of cupronickel alloy
  • Distribution optimization method of grain boundary characteristics based on friction stir processing of cupronickel alloy

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Embodiment 1

[0032] The distribution optimization method based on friction stir processing white copper alloy grain boundary characteristics according to the present invention comprises the following steps:

[0033] S1: Pretreatment of B10 white copper alloy, that is, solution treatment (treatment at 800°C for 30min, water quenching);

[0034] S2: Use the friction stir processing machine to perform friction stir processing on the white copper alloy plate. The rotation speed of the friction stir processing stirring head is 400 rpm, the feeding speed is 100 mm / min, the overlap ratio is 50%, and the reduction amount is 0.3 mm. as-processed samples;

[0035] S3: Perform annealing treatment at 700°C on the processed sample, and take it out for quenching after holding for 24 hours.

[0036] Determination of the distribution of grain boundary characteristics of the alloy: EBSD technology was used to observe and analyze the characteristic distribution of grain boundaries in the B10 cupronickel al...

Embodiment 2

[0038] The distribution optimization method based on friction stir processing white copper alloy grain boundary characteristics according to the present invention comprises the following steps:

[0039] S1: Pretreatment of B10 white copper alloy, that is, solution treatment (treatment at 800°C for 30min, water quenching);

[0040]S2: Use the friction stir processing machine to perform friction stir processing on the cupronickel alloy plate. The rotation speed of the friction stir processing stirring head is 600 rpm, the feeding speed is 100 mm / min, the lap rate is 50%, and the reduction amount is 0.3 mm. as-processed samples;

[0041] S3: Perform annealing treatment at 700°C on the processed sample, and take it out for quenching after holding for 24 hours.

[0042] Determination of the distribution of grain boundary characteristics of the alloy: EBSD technology was used to observe and analyze the characteristic distribution of grain boundaries in the B10 cupronickel alloy aft...

Embodiment 3

[0044] The distribution optimization method based on friction stir processing white copper alloy grain boundary characteristics according to the present invention comprises the following steps:

[0045] S1: Pretreatment of B10 white copper alloy, that is, solution treatment (treatment at 800°C for 30min, water quenching);

[0046] S2: Use the friction stir processing machine to perform friction stir processing on the cupronickel alloy plate. The rotation speed of the friction stir processing stirring head is 800 rpm, the feed speed is 100 mm / min, the overlap ratio is 50%, and the reduction amount is 0.3 mm. Obtained as-processed samples;

[0047] S3: Perform annealing treatment at 700°C on the processed sample, and take it out for quenching after holding for 24 hours.

[0048] Determination of the distribution of grain boundary characteristics of the alloy: EBSD technology was used to observe and analyze the characteristic distribution of grain boundaries in the B10 cupronick...

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Abstract

The invention discloses a method for optimizing the distribution of grain boundary characteristics of cupronickel alloy based on friction stir processing. The specific method is as follows: S1: first, carry out solid solution treatment on the cupronickel alloy and then water quench; S2: place the solid solution material in friction stir welding equipment , by adjusting the rotation speed, feed speed, lap rate and reduction of the friction stir welding head, friction stir processing is performed on the surface of the material; S3: the material after friction stir processing is placed in a heat treatment furnace for annealing treatment, After keeping warm, take out the water quenching. This method introduces residual stress through friction stir processing technology and combines the two steps of subsequent annealing heat treatment to optimize the distribution of grain boundary characteristics of cupronickel alloy; friction stir processing can process the surface of large-scale and complex-shaped workpieces, and can quickly optimize different The grain boundary structure of the surface layer of the regular material improves the corrosion resistance of the material, and is simple to operate, low in cost, green and pollution-free, and easy for industrial automation production.

Description

technical field [0001] The invention relates to the field of metal material deformation and heat treatment, in particular to a distribution optimization method based on friction stir processing of white copper alloy grain boundary characteristics. Background technique [0002] Cupronickel alloy has good mechanical properties and machining properties, and is often used in thermal power generation, nuclear power, shipbuilding, seawater desalination and marine engineering. With the development of my country's marine strategy, higher requirements have been placed on the performance of cupronickel materials. There is often intergranular corrosion in cupronickel alloys during use. Because this form of corrosion is suddenly destructive and unpredictable, it endangers production and life safety. In order to improve product quality and prolong service life, the corrosion resistance of cupronickel is further improved. Performance is especially important. [0003] As an important str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/08C22C9/06
CPCC22F1/08C22F1/002C22C9/06
Inventor 冯文孙强汪政葛林贺毅强杨建明左立杰孙春宇
Owner JIANGSU OCEAN UNIV
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