An integrated laser additive manufacturing method for selective strengthening of titanium or titanium alloy

Abstract

The invention provides an integrated laser additive manufacturing method for selective strengthening of titanium or titanium alloys, which can realize simultaneous completion of selective nitriding and workpiece forming in the process of additive manufacturing, without changing the original additive manufacturing process parameters. , to obtain a titanium nitride gradient strengthening layer combined with the substrate and dense without crack defects. The method is as follows: in an inert atmosphere processing chamber, the laser additive manufacturing of titanium or titanium alloy parts is carried out by layer-by-layer deposition; when it is deposited in a non-strengthening area, an inert gas is used as a powder-carrying gas and a laser lens protection gas ; When deposited in the strengthened area, without changing the process parameters, by using inert gas containing 30% to 100% nitrogen as the carrier gas and laser lens protection gas, the gas atmosphere at the molten pool is changed, so that The gas atmosphere at the melting pool contains 30% to 100% nitrogen, so that the titanium nitride strengthening layer is obtained after the strengthening area is deposited.

Description

technical field [0001] The invention belongs to the field of advanced manufacturing of titanium alloys, and relates to a method for modifying the surface of titanium and titanium alloys, in particular to an integrated laser additive manufacturing method for selective strengthening of titanium or titanium alloys. Background technique [0002] Titanium and titanium alloys are widely used in aviation, aerospace, chemical and medical fields due to their low density, high specific strength and good corrosion resistance. However, due to the high melting point of titanium alloys, high activity in the molten state, and high deformation resistance, it is generally necessary to use vacuum smelting to produce ingots, and subsequent shaping and forming processes are also relatively difficult. As a new part manufacturing technology, additive manufacturing technology can obtain near-net-shaped parts by layer-by-layer accumulation, which better solves the problem of difficulty in processin...

AI Technical Summary

Problems solved by technology

Although the three laser surface modification methods have their own advantages, they have a relatively high tendency to crack. The control of cracks usually requires a variety of complicated technological measures, and the strengthening cost is high. In addition, the forming and surface strengthening of parts are usually the Step by step, the time cost is also high

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