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

Abstract

The invention discloses a distribution optimization method based on stirring friction machining cupronickel alloy grain boundary characteristics. The distribution optimization method specifically comprises the steps that S1, firstly, cupronickel alloy is subjected to solution treatment and then subjected to water quenching; s2, the material obtained after solid solution is placed in friction stir welding equipment, and friction stir machining is conducted on the surface layer of the material by adjusting the rotating speed, the feeding speed, the lap joint rate and the rolling reduction of a friction stir welding stirring head; and S3, the material obtained after stirring friction machining is placed in a heat treatment furnace to be subjected to annealing treatment, and after heat preservation, the material is taken out and subjected to water quenching. According to the method, residual stress is introduced through the friction stir processing technology, and the two steps of follow-up annealing heat treatment are combined, so that the grain boundary characteristic distribution of the cupronickel alloy is optimized; friction stir processing can be used for processing the surface of a large-size workpiece in a complex shape, the grain boundary structure of the surface layer of an irregular material can be quickly optimized, the corrosion resistance of the material is improved, and the method is simple to operate, low in cost, green, pollution-free and easy for industrial automatic production.

Description

technical field [0001] The invention relates to the field of deformation and heat treatment of metal materials, in particular to a method for optimizing the distribution of grain boundary characteristics of cupronickel alloy based on friction stir processing. Background technique [0002] Cupronickel alloy has good mechanical properties and machining properties, and is often used in industries such as thermal power generation, nuclear power generation, shipbuilding, seawater desalination and marine engineering. With the development of my country's marine strategy, higher requirements are put forward for the performance of cupronickel materials. Cupronickel alloys often have intergranular corrosion 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, further improve the corrosion resistance of cupronickel Performance is especially important....

AI Technical Summary

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

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