Process for smelting cleaning titan and titan alloy casting ingot

Abstract

The invention discloses a method for melting a clean titanium ingot and a titanium alloy ingot. The method comprises the following steps of: weighing sponge titanium or weighing a pure alloy addition element, an intermediate alloy and sponge titanium; pressing the sponge titanium or the mixed pure alloy addition element, the intermediate alloy and the sponge titanium into an electrode block; soldering the pressed electrode block into an electrode; and performing primary electron-beam cold-hearth melting to the electrode by an electron-beam cold-hearth furnace to produce a titanium ingot or a titanium alloy ingot which are clean and have homogeneous chemical compositions. The melting vacuity for the electron-beam cold-hearth melting is lower than 6x10<-2>Pa, the melting speed for the electron-beam cold-hearth melting is between 70 and 150kg / h, and the melting power for the electron-beam cold-hearth melting is between 100 and 300kW; and the weight of the pure alloy addition elements and the intermediate alloys is 0 to 20 percent of the total weight of the titanium alloy ingot. The titanium ingot and the titanium alloy ingot produced by the method have homogeneous chemical compositions, and macrostructures of the ingots are superior to a vacuum consumable arc-melted ingot without TiN, WC and other high melting-point inclusions.

Description

technical field [0001] The invention relates to a method for smelting clean titanium and titanium alloy ingots, belonging to the technical field of titanium alloy smelting. Background technique [0002] Titanium alloys are widely used in aviation, aerospace and other fields due to their high specific strength, corrosion resistance, and high temperature resistance. Most titanium and titanium alloy parts are made of sponge titanium or pure alloys, adding elements, intermediate alloys and sponge titanium to press the electrode block, then welding the electrode block into an electrode, melting it into an ingot by vacuum consumable arc, and improving the structure and properties by forging. processed. The main production method of sponge titanium is the Kroll method. In the process of magnesium reduction and vacuum distillation, due to the possible air leakage and pollution, there are inevitably nitrogen-rich inclusions in the produced sponge titanium. In the subsequent crushing...